Hi all, I've been making repairs to my Pickering M100A mono blackhead cartridge and am wondering what the purpose of the "damping "grease inside of the shell is. The original grease had become nearly hard and was removed during repairs. What will happen if I don't replace it with a thick grease, such as dialectric grease and what is the purpose of the grease in the first place? On another issue, With no record on the turntable and "A" side selected, the tonearm moves into position and when pushed forward does not spring back but stays where it should.with forward pressure removed. If you continue to push, it will eventually trip the reject. Doing the same test, again without the record, on the "B" side, the tonearm wants to move back toward you when my finger stops pushing. With a record playing on the "B" side and entering the end of record runout it will often skip back a bit into the program rather than continue on and reject the record. I can override the issue by increasing the tension on the B side tension spring but would rather understand why the tonearm skates back on one side and not the other. Dean
On Oct 29, 2024, at 1:54 PM, Dean Carriveau via Jukebox-list jukebox-list@lists.netlojix.com wrote:
Hi all, I've been making repairs to my Pickering M100A mono blackhead cartridge and am wondering what the purpose of the "damping "grease inside of the shell is. The original grease had become nearly hard and was removed during repairs. What will happen if I don't replace it with a thick grease, such as dialectric grease and what is the purpose of the grease in the first place?
I’ve never seen a black head cartridge in person, but if memory serves me correctly it is possible that should be rubber and not grease.
With a record playing on the "B" side and entering the end of record runout it will often skip back a bit into the program rather than continue on and reject the record. I can override the issue by increasing the tension on the B side tension spring but would rather understand why the tonearm skates back on one side and not the other.
Check the routing of the tonearm wire and check for anything that might interfere with the tonearm or tonearm wire when playing the B side.
Carl Haines
Thank you, Carl. I appreciate your response and advice. I've checked the tonearm wire and re-positioned it several times with no change. By changing the position of counterweight on the heel of the carriage cradle, it does make a slight difference but then that affects the runout pickup of the "A" side. Go figure. I'll keep playing around until I find something that works. In regards to the M199A blackhead cartridge, is the damping grease used to reduce shrill highs, as it does in a Zenith Cobra? Anyone know why they packed those blackheads with grease?
Dean
On Tuesday, October 29, 2024 at 03:24:13 PM PDT, Carl Haines via Jukebox-list jukebox-list@lists.netlojix.com wrote:
On Oct 29, 2024, at 1:54 PM, Dean Carriveau via Jukebox-list jukebox-list@lists.netlojix.com wrote:
Hi all, I've been making repairs to my Pickering M100A mono blackhead cartridge and am wondering what the purpose of the "damping "grease inside of the shell is. The original grease had become nearly hard and was removed during repairs. What will happen if I don't replace it with a thick grease, such as dialectric grease and what is the purpose of the grease in the first place?
I’ve never seen a black head cartridge in person, but if memory serves me correctly it is possible that should be rubber and not grease.
With a record playing on the "B" side and entering the end of record runout it will often skip back a bit into the program rather than continue on and reject the record. I can override the issue by increasing the tension on the B side tension spring but would rather understand why the tonearm skates back on one side and not the other.
Check the routing of the tonearm wire and check for anything that might interfere with the tonearm or tonearm wire when playing the B side.
Carl Haines
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I have a similar but opposite problem with my M100-A. When the pickupsets down on the B-side, it frequently hops inward a couple grooves. It'sbeen doing this literally for decades and it defies my analysis. I even removedthe little spring that is supposed to nudge the stylus into the groove onolder records without a lead-in groove and that had no effect other than tooccasionally keep the A-side from engaging the groove. So the spring isback. I find that the problem is worse on the first B-side that's played afteran A-side, so sometimes I'll play multiple B-sides at a time. I'm resistingre-setting-up the mechanism, because conventional wisdom is that unlessthe the mechanism has endured some "traumatic" event, you're just as likely to make matters worse than better. As to the pickup grease, I've never seen anything in Seeburg literature thatdiscusses it's purpose, and their documentation is first rate. I had my pickuprebuilt by Wes-Tech years ago (mine was the first one Wes had done, and nowI understand that they no longer do them under the new ownership). Except for the detached armature it sounded pretty much the same as before, sansgrease. There is some blasting on high frequencies on shellac records from thelate 30s and early 40s, but on mid to late 50s, high-fidelity vinyl records the highfrequencies sound fine. So I attribute the distortion to groove wear, and stilldon't know what the grease is really for. BTW, if you want a good demonstrator for how good this machine can sound,look for Al Caiola's "El Cumbanchero" (RCA Victor E2-FB-7229 / 20-5400) whichis fairly common as a vinyl DJ pressing. It sounds fantastic.
David Breneman david_breneman@yahoo.com
check needle for wear, check needle pressure, check tone arm balance, check records for wear. ________________________________ From: Dean Carriveau via Jukebox-list jukebox-list@lists.netlojix.com Sent: Tuesday, October 29, 2024 10:54 AM To: jukeboxlist jukebox-list@lists.netlojix.com Cc: Dean Carriveau d.carriveau@att.net Subject: [Jukebox-list] M100A Pickering Cartridge
Hi all, I've been making repairs to my Pickering M100A mono blackhead cartridge and am wondering what the purpose of the "damping "grease inside of the shell is. The original grease had become nearly hard and was removed during repairs. What will happen if I don't replace it with a thick grease, such as dialectric grease and what is the purpose of the grease in the first place? On another issue, With no record on the turntable and "A" side selected, the tonearm moves into position and when pushed forward does not spring back but stays where it should.with forward pressure removed. If you continue to push, it will eventually trip the reject. Doing the same test, again without the record, on the "B" side, the tonearm wants to move back toward you when my finger stops pushing. With a record playing on the "B" side and entering the end of record runout it will often skip back a bit into the program rather than continue on and reject the record. I can override the issue by increasing the tension on the B side tension spring but would rather understand why the tonearm skates back on one side and not the other. Dean _______________________________________________ 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: https://na01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fjukebox.mark...http://jukebox.markmail.org/
I'm thinking out loud here and could be totally wrong, but when a b side is played, the record is spinning in reverse to the A side. As it's playing at 78rpm, would the forces be different in terms of an A side would pull the tone arm in towards the centre, whereas a b side would be pushing the arm out ? I'm trying to imagine the physics and the science of it. Coupled with the tension on the tone arm cancel switch adding its own push outwards, would any of those things exacerbate the issue at all ?
Although, now typing all that, I think Dean you mentioned the arm drifts in or out even when a record isn't in the slot, so maybe my theory doesn't apply. But it's got my brain going. And being the only 78 10 inch selectomatic, and the first generation, I guess there were design imperfections and coupled with a bit of wear, and adjustments, are showing themselves up.
Nigel, uk
On 30 Oct 2024 at 15:45, Doctor Jukebox via Jukebox-list jukebox-list@lists.netlojix.com wrote:
check needle for wear, check needle pressure, check tone arm balance, check records for wear. ________________________________ From: Dean Carriveau via Jukebox-list jukebox-list@lists.netlojix.com Sent: Tuesday, October 29, 2024 10:54 AM To: jukeboxlist jukebox-list@lists.netlojix.com Cc: Dean Carriveau d.carriveau@att.net Subject: [Jukebox-list] M100A Pickering Cartridge
Hi all, I've been making repairs to my Pickering M100A mono blackhead cartridge and am wondering what the purpose of the "damping "grease inside of the shell is. The original grease had become nearly hard and was removed during repairs. What will happen if I don't replace it with a thick grease, such as dialectric grease and what is the purpose of the grease in the first place? On another issue, With no record on the turntable and "A" side selected, the tonearm moves into position and when pushed forward does not spring back but stays where it should.with forward pressure removed. If you continue to push, it will eventually trip the reject. Doing the same test, again without the record, on the "B" side, the tonearm wants to move back toward you when my finger stops pushing. With a record playing on the "B" side and entering the end of record runout it will often skip back a bit into the program rather than continue on and reject the record. I can override the issue by increasing the tension on the B side tension spring but would rather understand why the tonearm skates back on one side and not the other. Dean _______________________________________________ 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: https://na01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fjukebox.mark...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/
Hi David and Nigel, Yeah, I really can't find any explanation as to why the damping grease is used either. As far as the adjustment goes for the backward skate on "B"side only, I'll keep playing with it. A quick fix to override the issue would be to increase the spring tension for tracking pressure on "B" side only but that also seems to cause more record wear. I'll keep scratching my head and let you know what, if anything, I come up with. Dean
On Wednesday, October 30, 2024 at 10:02:17 AM PDT, Nigel Pugh via Jukebox-list jukebox-list@lists.netlojix.com wrote:
I'm thinking out loud here and could be totally wrong, but when a b side is played, the record is spinning in reverse to the A side. As it's playing at 78rpm, would the forces be different in terms of an A side would pull the tone arm in towards the centre, whereas a b side would be pushing the arm out ? I'm trying to imagine the physics and the science of it. Coupled with the tension on the tone arm cancel switch adding its own push outwards, would any of those things exacerbate the issue at all ?
Although, now typing all that, I think Dean you mentioned the arm drifts in or out even when a record isn't in the slot, so maybe my theory doesn't apply. But it's got my brain going. And being the only 78 10 inch selectomatic, and the first generation, I guess there were design imperfections and coupled with a bit of wear, and adjustments, are showing themselves up.
Nigel, uk
On 30 Oct 2024 at 15:45, Doctor Jukebox via Jukebox-list jukebox-list@lists.netlojix.com wrote: check needle for wear, check needle pressure, check tone arm balance, check records for wear. ________________________________ From: Dean Carriveau via Jukebox-list jukebox-list@lists.netlojix.com Sent: Tuesday, October 29, 2024 10:54 AM To: jukeboxlist jukebox-list@lists.netlojix.com Cc: Dean Carriveau d.carriveau@att.net Subject: [Jukebox-list] M100A Pickering Cartridge
Hi all, I've been making repairs to my Pickering M100A mono blackhead cartridge and am wondering what the purpose of the "damping "grease inside of the shell is. The original grease had become nearly hard and was removed during repairs. What will happen if I don't replace it with a thick grease, such as dialectric grease and what is the purpose of the grease in the first place? On another issue, With no record on the turntable and "A" side selected, the tonearm moves into position and when pushed forward does not spring back but stays where it should.with forward pressure removed. If you continue to push, it will eventually trip the reject. Doing the same test, again without the record, on the "B" side, the tonearm wants to move back toward you when my finger stops pushing. With a record playing on the "B" side and entering the end of record runout it will often skip back a bit into the program rather than continue on and reject the record. I can override the issue by increasing the tension on the B side tension spring but would rather understand why the tonearm skates back on one side and not the other. Dean _______________________________________________ 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: https://na01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fjukebox.mark...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/
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Carl Haines -
David Breneman -
Dean Carriveau -
Doctor Jukebox -
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