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 NEW  Matt presents bias and operation data for the 6V6 tube in SE operation - 6V6 Single-Ended (SE) Ultra Linear (UL) Bias Optimization.

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PostPosted: 27 Jul 2016, 16:23 
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Joined: 25 Sep 2009, 15:44
Posts: 39
Location: ENGLAND, BABY- YEAH
Hey all,
I have a circa 1973/6 Rotel RP-1500 turntable that I am currently renovating. Although I am capable with a soldering iron, can follow schematics, I don't actually fully understand how components work and affect each other.....I would class myself as a "board stuffing over achiever"!!

There is an issue with the TT; when the circuit providing power to the motor is closed and the motor is running, the strobe light< (L0001), goes out, this should not happen, but, if the circuit to the motor is open, the strobe illuminates, as it should do, (constantly). I'm thinking possibly a grounding issue, but as a novice I'm not really sure.

I am intending to replace all resistors and caps with better quality/tolerance ones, but I'm pretty sure that won't cure the problem as the lamp lights when the motor circuit is open.....

I include the schematic for the TT and hope that some of you more knowledgeable folk could take a look and point me in the right direction!! :up:

It has the E type power trans strapping - 220/40V 50Hz;

Image

https://goo.gl/photos/oG2yVQ3jqmL8wXea9


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PostPosted: 29 Jul 2016, 16:46 
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Joined: 04 Jun 2008, 20:59
Posts: 3463
Location: Arizona, USA
Hi, The best source for information on turntables is at the vinylengine.com forums. Lots of friendly helpful folks there (just like here).

Good listening
Bruce

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