Loud buzzing noise whenever you play a record. Buzzing varies with volume control. replaced all the big electroltics already . any ideas:
Poor or broken ground at the cartridge, or where it connects to the input of the amplifier?
A break in ground/shield of the audio line from the cartridge to the amp?
Don Resor
Sent from someone's iPhone
On Nov 7, 2023, at 11:35 PM, Jim McClave via Jukebox-list jukebox-list@lists.netlojix.com wrote:
Loud buzzing noise whenever you play a record. Buzzing varies with volume control. replaced all the big electroltics already . any ideas: _______________________________________________ Jukebox-list mailing list -- jukebox-list@lists.netlojix.com To unsubscribe send an email to jukebox-list-leave@lists.netlojix.com %(web_page_url)slistinfo%(cgiext)s/%(_internal_name)s Searchable Archives: http://jukebox.markmail.org/
Rowe 1100/1200 anti skate.
Having some issues with my JBM and the erratic stylus landing point. Its none of the obvious suspects. What it is, I have proven, is the magnet that operates the trip reed switch is dragging the arm inwards. The whole assembly has become magnetised. As the record lands, before stylus touches groove, the magnet pulls the arm in a little. Ive replaced the reed switch with its metal bracket from an unused spare and de magnetised the area with a tape head demagnetiser. Thats all fine, and it works perfectly again.
But, my question is, behind the reed switch are two brackets about an inch apart. I have always thought these were a crude anti skate system. However, the bracket nearest the end of record play has to be bent right back. If its by the reed switch the arm really swings back due to the magnet and bracket attracting to eachother. Now magnetised or demagnetised, shouldn't matter, as metal to magnet will attract anyway. I can see how it could have been designed to bias the arm alightly outwards towards the end of the record to compensate for the natural pull inwards, but with this bracket in the correct place and not bent back, its brutal. Is it possible the actual trip magnet has got stronger over the years ??
I think you need to be very familiar with this mechanism to understand what i am saying as its not related to any others in the way this is set up. It's going to be an age and materials related issue as I've literally worked on 100s of these Rowe's on site and restored, and surprisingly only my own, which was only out of use between bar and my house for 2 years in the mid 80s, and has been used every single day for a few hours since, is the only one I've seen the problem on.
Tone arm missing record trip is removed and cartridge wire is off a Rega tonearm, there are no other factors it is 100 percent magnetism.
I shouldn't have to bend this bracket back as that's definitely not where it should be....
If I can find the parts in my shed I'm tempted to replace it all with a simple Rock Ola blade switch instead.
Nigel, uk.
On Wednesday, November 8, 2023 at 06:54:00 AM PST, Nigel Pugh via Jukebox-list jukebox-list@lists.netlojix.com wrote:
But, my question is, behind the reed switch are two brackets about an inch> apart. I have always thought these were a crude anti skate system.
I would be really surprised if anti-skating was a consideration in the designof this mechanism. I mean, the tone arm is even on the wrong side. That'snot something you do if you're concerned about delicately tracing a stereogroove. RCA never even considered skating in the design of the 45. Anti-skating didn't come into common use, as far as I know, until the 1970s. Andcommercial turntables, like those used in broadcasting, never had it.
Hi David,
I beg to differ on that one as the Continental 1 and 2 both had adjustable anti skate springs, so indeed, AMI must have been thinking about it.
The arm on the wrong side shouldn't make much difference as the cartridge still faces the same way in the groove, albeit that the arc traced by the tracking error is a different way around to the standard one. (but there again this would apply to the 2 stylus upright playing ones like Seeburg/NSM/Jupiter as well, for one of the styli.)
I agree it seems rare for anti skate. Maybe they were experimenting with it. I dunno.
I have 2 Gates CB77 broadcast decks from BBC Radio 1/2 and the big Gray Research unipivot tonearms certainly don't have any anti skate setup. I hear that above 3 grams it's not needed. Not sure if that's true or rumour but does make you wonder why Ami bothered.
Regards
Nigel, uk
On 8 Nov 2023 at 16:02, David Breneman via Jukebox-list jukebox-list@lists.netlojix.com wrote:
On Wednesday, November 8, 2023 at 06:54:00 AM PST, Nigel Pugh via Jukebox-list jukebox-list@lists.netlojix.com wrote:
But, my question is, behind the reed switch are two brackets about an inch> apart. I have always thought these were a crude anti skate system.
I would be really surprised if anti-skating was a consideration in the designof this mechanism. I mean, the tone arm is even on the wrong side. That'snot something you do if you're concerned about delicately tracing a stereogroove. RCA never even considered skating in the design of the 45. Anti-skating didn't come into common use, as far as I know, until the 1970s. Andcommercial turntables, like those used in broadcasting, never had it.
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Nigel, those two “fingers” are an anti-drift anti bias device.
With careful positioning they can slightly prevent the arm from boosting inward at the start of a record when the keeper on the can releases it.
I allow –slight—inward drift at the spiral.
They are touchy and very slight changes make a difference. In the original spec’ of 5 grams VTF it didn’t really matter. Since i use a better stylus and ran them at 2 gm I wanted the best possible setup.
RobNYC On Wednesday, November 8, 2023 at 09:54:21 AM GMT-5, Nigel Pugh via Jukebox-list jukebox-list@lists.netlojix.com wrote:
Rowe 1100/1200 anti skate.
Having some issues with my JBM and the erratic stylus landing point. Its none of the obvious suspects. What it is, I have proven, is the magnet that operates the trip reed switch is dragging the arm inwards. The whole assembly has become magnetised. As the record lands, before stylus touches groove, the magnet pulls the arm in a little. Ive replaced the reed switch with its metal bracket from an unused spare and de magnetised the area with a tape head demagnetiser. Thats all fine, and it works perfectly again.
But, my question is, behind the reed switch are two brackets about an inch apart. I have always thought these were a crude anti skate system. However, the bracket nearest the end of record play has to be bent right back. If its by the reed switch the arm really swings back due to the magnet and bracket attracting to eachother. Now magnetised or demagnetised, shouldn't matter, as metal to magnet will attract anyway. I can see how it could have been designed to bias the arm alightly outwards towards the end of the record to compensate for the natural pull inwards, but with this bracket in the correct place and not bent back, its brutal. Is it possible the actual trip magnet has got stronger over the years ??
I think you need to be very familiar with this mechanism to understand what i am saying as its not related to any others in the way this is set up. It's going to be an age and materials related issue as I've literally worked on 100s of these Rowe's on site and restored, and surprisingly only my own, which was only out of use between bar and my house for 2 years in the mid 80s, and has been used every single day for a few hours since, is the only one I've seen the problem on.
Tone arm missing record trip is removed and cartridge wire is off a Rega tonearm, there are no other factors it is 100 percent magnetism.
I shouldn't have to bend this bracket back as that's definitely not where it should be....
If I can find the parts in my shed I'm tempted to replace it all with a simple Rock Ola blade switch instead.
Nigel, uk.
_______________________________________________ Jukebox-list mailing list -- jukebox-list@lists.netlojix.com To unsubscribe send an email to jukebox-list-leave@lists.netlojix.com %(web_page_url)slistinfo%(cgiext)s/%(_internal_name)s Searchable Archives: http://jukebox.markmail.org/
Hi Rob,
Yes I'm at 2.5 grams, and the first one (closest to record start) is right up against the reed switch and works nicely to stop the inward drift. You are right, it controls that bit of no man's land where the cam spring has disengaged and the arm is in freefall. However, the one closest to record trip, I have to bend it almost horizontally. Any closer and it literally pulls the arm in really sharply. It's so apparent that I'm sure it would do some bad record damage if left like that. I can't help but thinking it should be at least reasonably close to the reed switch like it originally was.
If I remove the magnet completely, none of this happens so it's definitely the magnetic pull.
I thought about using an opto sensor as a bit of an inquisitive experiment. I think some of the later NSMs used them.
Do you have any documentation on how they should be adjusted ? I've got 3 or 4 manuals for jukeboxes with the 1100 in them but none of them mention their purpose or adjusting them.
Nigel
On 8 Nov 2023 at 19:32, Chan Gade via Jukebox-list jukebox-list@lists.netlojix.com wrote:
Nigel, those two “fingers” are an anti-drift anti bias device.
With careful positioning they can slightly prevent the arm from boosting inward at the start of a record when the keeper on the can releases it.
I allow –slight—inward drift at the spiral.
They are touchy and very slight changes make a difference. In the original spec’ of 5 grams VTF it didn’t really matter. Since i use a better stylus and ran them at 2 gm I wanted the best possible setup.
RobNYC On Wednesday, November 8, 2023 at 09:54:21 AM GMT-5, Nigel Pugh via Jukebox-list jukebox-list@lists.netlojix.com wrote:
Rowe 1100/1200 anti skate.
Having some issues with my JBM and the erratic stylus landing point. Its none of the obvious suspects. What it is, I have proven, is the magnet that operates the trip reed switch is dragging the arm inwards. The whole assembly has become magnetised. As the record lands, before stylus touches groove, the magnet pulls the arm in a little. Ive replaced the reed switch with its metal bracket from an unused spare and de magnetised the area with a tape head demagnetiser. Thats all fine, and it works perfectly again.
But, my question is, behind the reed switch are two brackets about an inch apart. I have always thought these were a crude anti skate system. However, the bracket nearest the end of record play has to be bent right back. If its by the reed switch the arm really swings back due to the magnet and bracket attracting to eachother. Now magnetised or demagnetised, shouldn't matter, as metal to magnet will attract anyway. I can see how it could have been designed to bias the arm alightly outwards towards the end of the record to compensate for the natural pull inwards, but with this bracket in the correct place and not bent back, its brutal. Is it possible the actual trip magnet has got stronger over the years ??
I think you need to be very familiar with this mechanism to understand what i am saying as its not related to any others in the way this is set up. It's going to be an age and materials related issue as I've literally worked on 100s of these Rowe's on site and restored, and surprisingly only my own, which was only out of use between bar and my house for 2 years in the mid 80s, and has been used every single day for a few hours since, is the only one I've seen the problem on.
Tone arm missing record trip is removed and cartridge wire is off a Rega tonearm, there are no other factors it is 100 percent magnetism.
I shouldn't have to bend this bracket back as that's definitely not where it should be....
If I can find the parts in my shed I'm tempted to replace it all with a simple Rock Ola blade switch instead.
Nigel, uk.
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I have a number of original manuals and none mention that setup. Like you i discovered it by experimenting. I figured they 'must be there for some reason" and it made sense. I wish the later mech was similar, those are too strongly biased. Even the crude "changer" type styli wags and skips . Rowe built their best mec, but put a POS tonearm in those last models.
RobNYC
On Wednesday, November 8, 2023 at 03:20:58 PM GMT-5, Nigel Pugh pughn@npsyssoft.force9.co.uk wrote:
Hi Rob,Yes I'm at 2.5 grams, and the first one (closest to record start) is right up against the reed switch and works nicely to stop the inward drift. You are right, it controls that bit of no man's land where the cam spring has disengaged and the arm is in freefall. However, the one closest to record trip, I have to bend it almost horizontally. Any closer and it literally pulls the arm in really sharply. It's so apparent that I'm sure it would do some bad record damage if left like that. I can't help but thinking it should be at least reasonably close to the reed switch like it originally was. If I remove the magnet completely, none of this happens so it's definitely the magnetic pull. I thought about using an opto sensor as a bit of an inquisitive experiment. I think some of the later NSMs used them.Do you have any documentation on how they should be adjusted ? I've got 3 or 4 manuals for jukeboxes with the 1100 in them but none of them mention their purpose or adjusting them. Nigel
On 8 Nov 2023 at 19:32, Chan Gade via Jukebox-list jukebox-list@lists.netlojix.com wrote:
Nigel, those two “fingers” are an anti-drift anti bias device.
With careful positioning they can slightly prevent the arm from boosting inward at the start of a record when the keeper on the can releases it.
I allow –slight—inward drift at the spiral.
They are touchy and very slight changes make a difference. In the original spec’ of 5 grams VTF it didn’t really matter. Since i use a better stylus and ran them at 2 gm I wanted the best possible setup.
RobNYC On Wednesday, November 8, 2023 at 09:54:21 AM GMT-5, Nigel Pugh via Jukebox-list jukebox-list@lists.netlojix.com wrote:
Rowe 1100/1200 anti skate.
Having some issues with my JBM and the erratic stylus landing point. Its none of the obvious suspects. What it is, I have proven, is the magnet that operates the trip reed switch is dragging the arm inwards. The whole assembly has become magnetised. As the record lands, before stylus touches groove, the magnet pulls the arm in a little. Ive replaced the reed switch with its metal bracket from an unused spare and de magnetised the area with a tape head demagnetiser. Thats all fine, and it works perfectly again.
But, my question is, behind the reed switch are two brackets about an inch apart. I have always thought these were a crude anti skate system. However, the bracket nearest the end of record play has to be bent right back. If its by the reed switch the arm really swings back due to the magnet and bracket attracting to eachother. Now magnetised or demagnetised, shouldn't matter, as metal to magnet will attract anyway. I can see how it could have been designed to bias the arm alightly outwards towards the end of the record to compensate for the natural pull inwards, but with this bracket in the correct place and not bent back, its brutal. Is it possible the actual trip magnet has got stronger over the years ??
I think you need to be very familiar with this mechanism to understand what i am saying as its not related to any others in the way this is set up. It's going to be an age and materials related issue as I've literally worked on 100s of these Rowe's on site and restored, and surprisingly only my own, which was only out of use between bar and my house for 2 years in the mid 80s, and has been used every single day for a few hours since, is the only one I've seen the problem on.
Tone arm missing record trip is removed and cartridge wire is off a Rega tonearm, there are no other factors it is 100 percent magnetism.
I shouldn't have to bend this bracket back as that's definitely not where it should be....
If I can find the parts in my shed I'm tempted to replace it all with a simple Rock Ola blade switch instead.
Nigel, uk.
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Yes I remember those arms. I never had a reason to investigate the bias on them, but I do vaguely remember there was an issue with something breaking on a few of them around the pivot or that crude PCB by the arm, and they wouldn't play. Over here where I live close to Birmingham those Rowe's were the mainstream jukebox for the 80s. Only real competition was NSM.
Nigel
On 8 Nov 2023 at 22:38, Chan Gade via Jukebox-list jukebox-list@lists.netlojix.com wrote:
I have a number of original manuals and none mention that setup. Like you i discovered it by experimenting. I figured they 'must be there for some reason" and it made sense. I wish the later mech was similar, those are too strongly biased. Even the crude "changer" type styli wags and skips . Rowe built their best mec, but put a POS tonearm in those last models.
RobNYC
On Wednesday, November 8, 2023 at 03:20:58 PM GMT-5, Nigel Pugh pughn@npsyssoft.force9.co.uk wrote:
Hi Rob,Yes I'm at 2.5 grams, and the first one (closest to record start) is right up against the reed switch and works nicely to stop the inward drift. You are right, it controls that bit of no man's land where the cam spring has disengaged and the arm is in freefall. However, the one closest to record trip, I have to bend it almost horizontally. Any closer and it literally pulls the arm in really sharply. It's so apparent that I'm sure it would do some bad record damage if left like that. I can't help but thinking it should be at least reasonably close to the reed switch like it originally was. If I remove the magnet completely, none of this happens so it's definitely the magnetic pull. I thought about using an opto sensor as a bit of an inquisitive experiment. I think some of the later NSMs used them.Do you have any documentation on how they should be adjusted ? I've got 3 or 4 manuals for jukeboxes with the 1100 in them but none of them mention their purpose or adjusting them. Nigel
On 8 Nov 2023 at 19:32, Chan Gade via Jukebox-list jukebox-list@lists.netlojix.com wrote:
Nigel, those two “fingers” are an anti-drift anti bias device.
With careful positioning they can slightly prevent the arm from boosting inward at the start of a record when the keeper on the can releases it.
I allow –slight—inward drift at the spiral.
They are touchy and very slight changes make a difference. In the original spec’ of 5 grams VTF it didn’t really matter. Since i use a better stylus and ran them at 2 gm I wanted the best possible setup.
RobNYC On Wednesday, November 8, 2023 at 09:54:21 AM GMT-5, Nigel Pugh via Jukebox-list jukebox-list@lists.netlojix.com wrote:
Rowe 1100/1200 anti skate.
Having some issues with my JBM and the erratic stylus landing point. Its none of the obvious suspects. What it is, I have proven, is the magnet that operates the trip reed switch is dragging the arm inwards. The whole assembly has become magnetised. As the record lands, before stylus touches groove, the magnet pulls the arm in a little. Ive replaced the reed switch with its metal bracket from an unused spare and de magnetised the area with a tape head demagnetiser. Thats all fine, and it works perfectly again.
But, my question is, behind the reed switch are two brackets about an inch apart. I have always thought these were a crude anti skate system. However, the bracket nearest the end of record play has to be bent right back. If its by the reed switch the arm really swings back due to the magnet and bracket attracting to eachother. Now magnetised or demagnetised, shouldn't matter, as metal to magnet will attract anyway. I can see how it could have been designed to bias the arm alightly outwards towards the end of the record to compensate for the natural pull inwards, but with this bracket in the correct place and not bent back, its brutal. Is it possible the actual trip magnet has got stronger over the years ??
I think you need to be very familiar with this mechanism to understand what i am saying as its not related to any others in the way this is set up. It's going to be an age and materials related issue as I've literally worked on 100s of these Rowe's on site and restored, and surprisingly only my own, which was only out of use between bar and my house for 2 years in the mid 80s, and has been used every single day for a few hours since, is the only one I've seen the problem on.
Tone arm missing record trip is removed and cartridge wire is off a Rega tonearm, there are no other factors it is 100 percent magnetism.
I shouldn't have to bend this bracket back as that's definitely not where it should be....
If I can find the parts in my shed I'm tempted to replace it all with a simple Rock Ola blade switch instead.
Nigel, uk.
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Does it do it with the input unplugged?
On Wed, Nov 8, 2023, 5:28 AM Don R via Jukebox-list < jukebox-list@lists.netlojix.com> wrote:
Poor or broken ground at the cartridge, or where it connects to the input of the amplifier?
A break in ground/shield of the audio line from the cartridge to the amp?
Don Resor
Sent from someone's iPhone
On Nov 7, 2023, at 11:35 PM, Jim McClave via Jukebox-list <
jukebox-list@lists.netlojix.com> wrote:
Loud buzzing noise whenever you play a record. Buzzing varies with
volume control. replaced all the big electroltics already . any ideas:
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yes
On Wednesday, November 8, 2023 at 01:13:41 PM EST, Paul Howlett via Jukebox-list jukebox-list@lists.netlojix.com wrote:
Does it do it with the input unplugged?
On Wed, Nov 8, 2023, 5:28 AM Don R via Jukebox-list < jukebox-list@lists.netlojix.com> wrote:
Poor or broken ground at the cartridge, or where it connects to the input of the amplifier?
A break in ground/shield of the audio line from the cartridge to the amp?
Don Resor
Sent from someone's iPhone
On Nov 7, 2023, at 11:35 PM, Jim McClave via Jukebox-list <
jukebox-list@lists.netlojix.com> wrote:
Loud buzzing noise whenever you play a record. Buzzing varies with
volume control. replaced all the big electroltics already . any ideas:
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On 2023/11/08 10:17 a.m., Jim McClave via Jukebox-list wrote:
yes
Jim, does the volume control affect the noise level?
If yes, then there is a problem in the pre-amp, if no, then the problem is in the output stage.
Is the noise the same on both channels with the inputs unplugged?
John :-#)#
On Wednesday, November 8, 2023 at 01:13:41 PM EST, Paul Howlett via Jukebox-list <jukebox-list@lists.netlojix.com> wrote:Does it do it with the input unplugged?
On Wed, Nov 8, 2023, 5:28 AM Don R via Jukebox-list < jukebox-list@lists.netlojix.com> wrote:
Poor or broken ground at the cartridge, or where it connects to the input of the amplifier?
A break in ground/shield of the audio line from the cartridge to the amp?
Don Resor
Sent from someone's iPhone
On Nov 7, 2023, at 11:35 PM, Jim McClave via Jukebox-list <
jukebox-list@lists.netlojix.com> wrote:
Loud buzzing noise whenever you play a record. Buzzing varies with
volume control. replaced all the big electroltics already . any ideas:
Since it is affected by the volume control we can assume the problem is ahead of it.
Listen to these two sound files. http://www.fileconvoy.com/dfl.php?id=g0bef791efb3d638b10005251794e2757a4b661... First is 60hz. This is defective ground shielding.
The second is 120hz. this is inadequate filtering of the B+ or excessive drain on it. The latter is unlikely here, but check for approx + 23 volts DC (clean –no ripple) on pins 2 & 23 on the preamp/agc board.
All this assumes you are checking with no phono input connected.
RobNYC On Wednesday, November 8, 2023 at 02:36:00 AM GMT-5, Jim McClave via Jukebox-list jukebox-list@lists.netlojix.com wrote:
Loud buzzing noise whenever you play a record. Buzzing varies with volume control. replaced all the big electroltics already . any ideas: _______________________________________________ Jukebox-list mailing list -- jukebox-list@lists.netlojix.com To unsubscribe send an email to jukebox-list-leave@lists.netlojix.com %(web_page_url)slistinfo%(cgiext)s/%(_internal_name)s Searchable Archives: http://jukebox.markmail.org/
Chan, nothing happens when I click onto that link you sent. Jim On Wednesday, November 8, 2023 at 02:21:16 PM EST, Chan Gade via Jukebox-list jukebox-list@lists.netlojix.com wrote:
Since it is affected by the volume control we can assume the problem is ahead of it.
Listen to these two sound files. http://www.fileconvoy.com/dfl.php?id=g0bef791efb3d638b10005251794e2757a4b661... First is 60hz. This is defective ground shielding.
The second is 120hz. this is inadequate filtering of the B+ or excessive drain on it. The latter is unlikely here, but check for approx + 23 volts DC (clean –no ripple) on pins 2 & 23 on the preamp/agc board.
All this assumes you are checking with no phono input connected.
RobNYC On Wednesday, November 8, 2023 at 02:36:00 AM GMT-5, Jim McClave via Jukebox-list jukebox-list@lists.netlojix.com wrote:
Loud buzzing noise whenever you play a record. Buzzing varies with volume control. replaced all the big electroltics already . any ideas: _______________________________________________ Jukebox-list mailing list -- jukebox-list@lists.netlojix.com To unsubscribe send an email to jukebox-list-leave@lists.netlojix.com %(web_page_url)slistinfo%(cgiext)s/%(_internal_name)s Searchable Archives: http://jukebox.markmail.org/%C2%A0 _______________________________________________ Jukebox-list mailing list -- jukebox-list@lists.netlojix.com To unsubscribe send an email to jukebox-list-leave@lists.netlojix.com %(web_page_url)slistinfo%(cgiext)s/%(_internal_name)s Searchable Archives: http://jukebox.markmail.org/
I was able open the link. You then need to download the file hums-2.Wav
Don Resor
Sent from someone's iPhone
On Nov 8, 2023, at 11:32 PM, Jim McClave via Jukebox-list jukebox-list@lists.netlojix.com wrote:
Chan, nothing happens when I click onto that link you sent. Jim On Wednesday, November 8, 2023 at 02:21:16 PM EST, Chan Gade via Jukebox-list jukebox-list@lists.netlojix.com wrote:
Since it is affected by the volume control we can assume the problem is ahead of it.
Listen to these two sound files. http://www.fileconvoy.com/dfl.php?id=g0bef791efb3d638b10005251794e2757a4b661... First is 60hz. This is defective ground shielding.
The second is 120hz. this is inadequate filtering of the B+ or excessive drain on it. The latter is unlikely here, but check for approx + 23 volts DC (clean –no ripple) on pins 2 & 23 on the preamp/agc board.
All this assumes you are checking with no phono input connected.
RobNYC On Wednesday, November 8, 2023 at 02:36:00 AM GMT-5, Jim McClave via Jukebox-list jukebox-list@lists.netlojix.com wrote:
Loud buzzing noise whenever you play a record. Buzzing varies with volume control. replaced all the big electroltics already . any ideas: _______________________________________________ Jukebox-list mailing list -- jukebox-list@lists.netlojix.com To unsubscribe send an email to jukebox-list-leave@lists.netlojix.com %(web_page_url)slistinfo%(cgiext)s/%(_internal_name)s Searchable Archives: http://jukebox.markmail.org/ _______________________________________________ Jukebox-list mailing list -- jukebox-list@lists.netlojix.com To unsubscribe send an email to jukebox-list-leave@lists.netlojix.com %(web_page_url)slistinfo%(cgiext)s/%(_internal_name)s Searchable Archives: http://jukebox.markmail.org/ _______________________________________________ Jukebox-list mailing list -- jukebox-list@lists.netlojix.com To unsubscribe send an email to jukebox-list-leave@lists.netlojix.com %(web_page_url)slistinfo%(cgiext)s/%(_internal_name)s Searchable Archives: http://jukebox.markmail.org/
Apparently the list software grays-out the hyperlink so you have to copy-paste.
RobNYC On Thursday, November 9, 2023 at 04:50:27 AM GMT-5, Don R via Jukebox-list jukebox-list@lists.netlojix.com wrote:
I was able open the link. You then need to download the file hums-2.Wav
Don Resor
Sent from someone's iPhone
On Nov 8, 2023, at 11:32 PM, Jim McClave via Jukebox-list jukebox-list@lists.netlojix.com wrote:
Chan, nothing happens when I click onto that link you sent. Jim On Wednesday, November 8, 2023 at 02:21:16 PM EST, Chan Gade via Jukebox-list jukebox-list@lists.netlojix.com wrote:
Since it is affected by the volume control we can assume the problem is ahead of it.
Listen to these two sound files. http://www.fileconvoy.com/dfl.php?id=g0bef791efb3d638b10005251794e2757a4b661... First is 60hz. This is defective ground shielding.
The second is 120hz. this is inadequate filtering of the B+ or excessive drain on it. The latter is unlikely here, but check for approx + 23 volts DC (clean –no ripple) on pins 2 & 23 on the preamp/agc board.
All this assumes you are checking with no phono input connected.
RobNYC On Wednesday, November 8, 2023 at 02:36:00 AM GMT-5, Jim McClave via Jukebox-list jukebox-list@lists.netlojix.com wrote:
Loud buzzing noise whenever you play a record. Buzzing varies with volume control. replaced all the big electroltics already . any ideas: _______________________________________________ Jukebox-list mailing list -- jukebox-list@lists.netlojix.com To unsubscribe send an email to jukebox-list-leave@lists.netlojix.com %(web_page_url)slistinfo%(cgiext)s/%(_internal_name)s Searchable Archives: http://jukebox.markmail.org/%C2%A0 _______________________________________________ Jukebox-list mailing list -- jukebox-list@lists.netlojix.com To unsubscribe send an email to jukebox-list-leave@lists.netlojix.com %(web_page_url)slistinfo%(cgiext)s/%(_internal_name)s Searchable Archives: http://jukebox.markmail.org/%C2%A0 _______________________________________________ Jukebox-list mailing list -- jukebox-list@lists.netlojix.com To unsubscribe send an email to jukebox-list-leave@lists.netlojix.com %(web_page_url)slistinfo%(cgiext)s/%(_internal_name)s Searchable Archives: http://jukebox.markmail.org/
_______________________________________________ Jukebox-list mailing list -- jukebox-list@lists.netlojix.com To unsubscribe send an email to jukebox-list-leave@lists.netlojix.com %(web_page_url)slistinfo%(cgiext)s/%(_internal_name)s Searchable Archives: http://jukebox.markmail.org/
Update on this amp: It buzzes when the input rca jacks are not connected. It does vary with the volume control. Also , appears to be from the left channel only . Jim On Thursday, November 9, 2023 at 11:53:17 AM EST, Chan Gade via Jukebox-list jukebox-list@lists.netlojix.com wrote:
Apparently the list software grays-out the hyperlink so you have to copy-paste.
RobNYC On Thursday, November 9, 2023 at 04:50:27 AM GMT-5, Don R via Jukebox-list jukebox-list@lists.netlojix.com wrote:
I was able open the link. You then need to download the file hums-2.Wav
Don Resor
Sent from someone's iPhone
On Nov 8, 2023, at 11:32 PM, Jim McClave via Jukebox-list jukebox-list@lists.netlojix.com wrote:
Chan, nothing happens when I click onto that link you sent. Jim On Wednesday, November 8, 2023 at 02:21:16 PM EST, Chan Gade via Jukebox-list jukebox-list@lists.netlojix.com wrote:
Since it is affected by the volume control we can assume the problem is ahead of it.
Listen to these two sound files. http://www.fileconvoy.com/dfl.php?id=g0bef791efb3d638b10005251794e2757a4b661... First is 60hz. This is defective ground shielding.
The second is 120hz. this is inadequate filtering of the B+ or excessive drain on it. The latter is unlikely here, but check for approx + 23 volts DC (clean –no ripple) on pins 2 & 23 on the preamp/agc board.
All this assumes you are checking with no phono input connected.
RobNYC On Wednesday, November 8, 2023 at 02:36:00 AM GMT-5, Jim McClave via Jukebox-list jukebox-list@lists.netlojix.com wrote:
Loud buzzing noise whenever you play a record. Buzzing varies with volume control. replaced all the big electroltics already . any ideas: _______________________________________________ Jukebox-list mailing list -- jukebox-list@lists.netlojix.com To unsubscribe send an email to jukebox-list-leave@lists.netlojix.com %(web_page_url)slistinfo%(cgiext)s/%(_internal_name)s Searchable Archives: http://jukebox.markmail.org/%C2%A0 _______________________________________________ Jukebox-list mailing list -- jukebox-list@lists.netlojix.com To unsubscribe send an email to jukebox-list-leave@lists.netlojix.com %(web_page_url)slistinfo%(cgiext)s/%(_internal_name)s Searchable Archives: http://jukebox.markmail.org/%C2%A0 _______________________________________________ Jukebox-list mailing list -- jukebox-list@lists.netlojix.com To unsubscribe send an email to jukebox-list-leave@lists.netlojix.com %(web_page_url)slistinfo%(cgiext)s/%(_internal_name)s Searchable Archives: http://jukebox.markmail.org/
_______________________________________________ Jukebox-list mailing list -- jukebox-list@lists.netlojix.com To unsubscribe send an email to jukebox-list-leave@lists.netlojix.com %(web_page_url)slistinfo%(cgiext)s/%(_internal_name)s Searchable Archives: http://jukebox.markmail.org/%C2%A0 _______________________________________________ Jukebox-list mailing list -- jukebox-list@lists.netlojix.com To unsubscribe send an email to jukebox-list-leave@lists.netlojix.com %(web_page_url)slistinfo%(cgiext)s/%(_internal_name)s Searchable Archives: http://jukebox.markmail.org/
I can get to where it says Huns 2 way , then cant get anywhere from there. I have heard electrlotyic ac hum before, this sounds more high pitched, more like a buzzer. Jim On Thursday, November 9, 2023 at 11:53:17 AM EST, Chan Gade via Jukebox-list jukebox-list@lists.netlojix.com wrote:
Apparently the list software grays-out the hyperlink so you have to copy-paste.
RobNYC On Thursday, November 9, 2023 at 04:50:27 AM GMT-5, Don R via Jukebox-list jukebox-list@lists.netlojix.com wrote:
I was able open the link. You then need to download the file hums-2.Wav
Don Resor
Sent from someone's iPhone
On Nov 8, 2023, at 11:32 PM, Jim McClave via Jukebox-list jukebox-list@lists.netlojix.com wrote:
Chan, nothing happens when I click onto that link you sent. Jim On Wednesday, November 8, 2023 at 02:21:16 PM EST, Chan Gade via Jukebox-list jukebox-list@lists.netlojix.com wrote:
Since it is affected by the volume control we can assume the problem is ahead of it.
Listen to these two sound files. http://www.fileconvoy.com/dfl.php?id=g0bef791efb3d638b10005251794e2757a4b661... First is 60hz. This is defective ground shielding.
The second is 120hz. this is inadequate filtering of the B+ or excessive drain on it. The latter is unlikely here, but check for approx + 23 volts DC (clean –no ripple) on pins 2 & 23 on the preamp/agc board.
All this assumes you are checking with no phono input connected.
RobNYC On Wednesday, November 8, 2023 at 02:36:00 AM GMT-5, Jim McClave via Jukebox-list jukebox-list@lists.netlojix.com wrote:
Loud buzzing noise whenever you play a record. Buzzing varies with volume control. replaced all the big electroltics already . any ideas: _______________________________________________ Jukebox-list mailing list -- jukebox-list@lists.netlojix.com To unsubscribe send an email to jukebox-list-leave@lists.netlojix.com %(web_page_url)slistinfo%(cgiext)s/%(_internal_name)s Searchable Archives: http://jukebox.markmail.org/%C2%A0 _______________________________________________ Jukebox-list mailing list -- jukebox-list@lists.netlojix.com To unsubscribe send an email to jukebox-list-leave@lists.netlojix.com %(web_page_url)slistinfo%(cgiext)s/%(_internal_name)s Searchable Archives: http://jukebox.markmail.org/%C2%A0 _______________________________________________ Jukebox-list mailing list -- jukebox-list@lists.netlojix.com To unsubscribe send an email to jukebox-list-leave@lists.netlojix.com %(web_page_url)slistinfo%(cgiext)s/%(_internal_name)s Searchable Archives: http://jukebox.markmail.org/
_______________________________________________ Jukebox-list mailing list -- jukebox-list@lists.netlojix.com To unsubscribe send an email to jukebox-list-leave@lists.netlojix.com %(web_page_url)slistinfo%(cgiext)s/%(_internal_name)s Searchable Archives: http://jukebox.markmail.org/%C2%A0 _______________________________________________ Jukebox-list mailing list -- jukebox-list@lists.netlojix.com To unsubscribe send an email to jukebox-list-leave@lists.netlojix.com %(web_page_url)slistinfo%(cgiext)s/%(_internal_name)s Searchable Archives: http://jukebox.markmail.org/
Correction : I have the loud buzzing noise coming out of both channels. It varies with the volume control. Input rca plugs disconnected.
On Thursday, November 9, 2023 at 12:15:40 PM EST, Jim McClave via Jukebox-list jukebox-list@lists.netlojix.com wrote:
I can get to where it says Huns 2 way , then cant get anywhere from there. I have heard electrlotyic ac hum before, this sounds more high pitched, more like a buzzer. Jim On Thursday, November 9, 2023 at 11:53:17 AM EST, Chan Gade via Jukebox-list jukebox-list@lists.netlojix.com wrote:
Apparently the list software grays-out the hyperlink so you have to copy-paste.
RobNYC On Thursday, November 9, 2023 at 04:50:27 AM GMT-5, Don R via Jukebox-list jukebox-list@lists.netlojix.com wrote:
I was able open the link. You then need to download the file hums-2.Wav
Don Resor
Sent from someone's iPhone
On Nov 8, 2023, at 11:32 PM, Jim McClave via Jukebox-list jukebox-list@lists.netlojix.com wrote:
Chan, nothing happens when I click onto that link you sent. Jim On Wednesday, November 8, 2023 at 02:21:16 PM EST, Chan Gade via Jukebox-list jukebox-list@lists.netlojix.com wrote:
Since it is affected by the volume control we can assume the problem is ahead of it.
Listen to these two sound files. http://www.fileconvoy.com/dfl.php?id=g0bef791efb3d638b10005251794e2757a4b661... First is 60hz. This is defective ground shielding.
The second is 120hz. this is inadequate filtering of the B+ or excessive drain on it. The latter is unlikely here, but check for approx + 23 volts DC (clean –no ripple) on pins 2 & 23 on the preamp/agc board.
All this assumes you are checking with no phono input connected.
RobNYC On Wednesday, November 8, 2023 at 02:36:00 AM GMT-5, Jim McClave via Jukebox-list jukebox-list@lists.netlojix.com wrote:
Loud buzzing noise whenever you play a record. Buzzing varies with volume control. replaced all the big electroltics already . any ideas: _______________________________________________ Jukebox-list mailing list -- jukebox-list@lists.netlojix.com To unsubscribe send an email to jukebox-list-leave@lists.netlojix.com %(web_page_url)slistinfo%(cgiext)s/%(_internal_name)s Searchable Archives: http://jukebox.markmail.org/%C2%A0 _______________________________________________ Jukebox-list mailing list -- jukebox-list@lists.netlojix.com To unsubscribe send an email to jukebox-list-leave@lists.netlojix.com %(web_page_url)slistinfo%(cgiext)s/%(_internal_name)s Searchable Archives: http://jukebox.markmail.org/%C2%A0 _______________________________________________ Jukebox-list mailing list -- jukebox-list@lists.netlojix.com To unsubscribe send an email to jukebox-list-leave@lists.netlojix.com %(web_page_url)slistinfo%(cgiext)s/%(_internal_name)s Searchable Archives: http://jukebox.markmail.org/
_______________________________________________ Jukebox-list mailing list -- jukebox-list@lists.netlojix.com To unsubscribe send an email to jukebox-list-leave@lists.netlojix.com %(web_page_url)slistinfo%(cgiext)s/%(_internal_name)s Searchable Archives: http://jukebox.markmail.org/%C2%A0 _______________________________________________ Jukebox-list mailing list -- jukebox-list@lists.netlojix.com To unsubscribe send an email to jukebox-list-leave@lists.netlojix.com %(web_page_url)slistinfo%(cgiext)s/%(_internal_name)s Searchable Archives: http://jukebox.markmail.org/%C2%A0 _______________________________________________ Jukebox-list mailing list -- jukebox-list@lists.netlojix.com To unsubscribe send an email to jukebox-list-leave@lists.netlojix.com %(web_page_url)slistinfo%(cgiext)s/%(_internal_name)s Searchable Archives: http://jukebox.markmail.org/
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