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/