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Vinyl Asylum Welcome Licorice Pizza (LP) lovers! Setup guides and Vinyl FAQ. |
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Vinyl Asylum Welcome Licorice Pizza (LP) lovers! Setup guides and Vinyl FAQ. |
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In Reply to: Speed accuracy on vintage belt drive TT with "electronic speed control" posted by JoshT on January 13, 2017 at 23:02:46:
Josh: As you can see in the schematic, there's a trim pot (R495/497)in series to each of the pitch control pots (R496/498). So you'd simply turn R496 & R498 to the middle position each and then adjust the "base speeds" with R495 & R497, which are both located on the main pcb.
Given the age of the AF877, I'd suggest to turn both trim pots and both pitch control pots all the way a couple of times each for some "exercise" and then turn 'em all back to middle position, before you perform the actual adjustment. And as the motor control isn't quartz-referenced, you might additionally want to give it a bit of a warm-up before the adjustment (20 minutes to half an hour should do) - because without quartz-referencing there'll usually be some temperature-related drift during warm-up.
Greetings from Munich & have fun with your AF877 (*)!
Manfred / lini
*) Nice table - and one of the few belt-drives with actual platter speed sensing. Keep it out of direct sunlight, though - otherwise the bumpers of the hood will melt and leave a sticky residue. And direct sunlight would also increase the tendency of the case bottom to bend inwards, which the AFxx7 models unfortunately have - and which can even cause malfuntions, if it's bad enough...
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Follow Ups
- RE: Speed accuracy on vintage belt drive TT with "electronic speed control" - rindolini 06:03:28 01/14/17 (1)
- Regarding your footnote (*) . . . - JoshT 09:01:33 01/14/17 (0)
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