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Old 1st July 2012, 09:06 AM   #1
wally5 is offline wally5  New Zealand
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Join Date: Oct 2009
Location: Auckland
Default Calibrate speed on turntable

Hi all, heres my first attempt to calibrate speed on my turntable,
after cleaning dirty trim pots. see link.

https://picasaweb.google.com/1133366...i-k8i768vDxwE#
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Old 2nd July 2012, 07:28 PM   #2
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Wait a microsecond... the TT boldly proclaims "quartz lock", yet has trim pots?

Anyway, it is not obvious what you were doing from the pictures alone.

I also did some speed tweaking on a basic Technics recently. The low-tech method with an object placed on the platter, a stopwatch and some patience got me within .1% of nominal speed.
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Old 2nd July 2012, 11:18 PM   #3
wally5 is offline wally5  New Zealand
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Join Date: Oct 2009
Location: Auckland
Quote:
Originally Posted by sgrossklass View Post
Wait a microsecond... the TT boldly proclaims "quartz lock", yet has trim pots?

Anyway, it is not obvious what you were doing from the pictures alone.

I also did some speed tweaking on a basic Technics recently. The low-tech method with an object placed on the platter, a stopwatch and some patience got me within .1% of nominal speed.
Hi, the turntable is a Kenwood KD-600 and a detailed service manual can be found on Vinylengine.com. Wasnít sure what I was doing when doing adjustments, just following instructions in service manual as you can see in images their are two wave forms on Oscilloscope. These two wave forms have to synchronize with each another, once this happens by adjusting trim pots, quartz lock circuit comes within range and takes over and locks onto speed. Turntable was brought on a site called Trademe here in NZ. site is very much like Ebay . As with all vintage gear it needs work, table came with a SME 3009 series 3 tone arm which wasnít in very good condition, have spend a small fortune on Ebay buying parts to restore arm, also had to rewire arm wand which I didnít find easy thing to do, very detailed work. So I get this tone arm sorted then end up with this speed issue. Itís been keeping me busy, but worth it. Itís a great performer and best deck to date. I think these direct drive decks are in a class of their own.
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