I’m still wrestling with this one, All capacitors have been replaced and resistors have been checked for tolerance, tubes new, 6U8 with conversion sockets in place of 7199, and all is as it should be. The sound from channel 1 is good and strong but might be a slight bit distorted (hard to tell on my bench setup) but likely ok. Channel 2 is considerably lower volume and definite distortion. All voltages check good, I also put a signal tracer right after the transistors and the sound was clear and balanced. I’m looking at the schematics and wondering if CR104 or CR103 (double selenium diodes) could be causing this? Not sure if they would affect the sound? Thought I’d get some opinions here on where to look next. Thanks, Mauro
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Hi Mauro here’s a stab in the dark for you possible bad speaker on channel 2.
Regards
On Tue, Feb 20, 2024 at 8:18 PM M De Simone via Jukebox-list < jukebox-list@lists.netlojix.com> wrote:
I’m still wrestling with this one, All capacitors have been replaced and resistors have been checked for tolerance, tubes new, 6U8 with conversion sockets in place of 7199, and all is as it should be. The sound from channel 1 is good and strong but might be a slight bit distorted (hard to tell on my bench setup) but likely ok. Channel 2 is considerably lower volume and definite distortion. All voltages check good, I also put a signal tracer right after the transistors and the sound was clear and balanced. I’m looking at the schematics and wondering if CR104 or CR103 (double selenium diodes) could be causing this? Not sure if they would affect the sound? Thought I’d get some opinions here on where to look next. Thanks, Mauro
Sent from my iPhone _______________________________________________ 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/
Thanks for the reply, We are testing it on the bench speakers, outside the jukebox, but it displayed the same symptoms when installed in the juke. I also tried different speakers with same results. I’m pretty sure the problem is in the amplifier but I’m not as familiar with this era amplifier as I am with the mono Seeburgs.
Sent from my iPhone
On Feb 20, 2024, at 9:17 PM, Donald Whiting via Jukebox-list jukebox-list@lists.netlojix.com wrote:
Hi Mauro here’s a stab in the dark for you possible bad speaker on channel 2.
Regards
On Tue, Feb 20, 2024 at 8:18 PM M De Simone via Jukebox-list < jukebox-list@lists.netlojix.com> wrote:
I’m still wrestling with this one, All capacitors have been replaced and resistors have been checked for tolerance, tubes new, 6U8 with conversion sockets in place of 7199, and all is as it should be. The sound from channel 1 is good and strong but might be a slight bit distorted (hard to tell on my bench setup) but likely ok. Channel 2 is considerably lower volume and definite distortion. All voltages check good, I also put a signal tracer right after the transistors and the sound was clear and balanced. I’m looking at the schematics and wondering if CR104 or CR103 (double selenium diodes) could be causing this? Not sure if they would affect the sound? Thought I’d get some opinions here on where to look next. Thanks, Mauro
Sent from my iPhone _______________________________________________ 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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