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Roger Mayer RM56

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bryce Goggin

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I have found a bad transistor in my stereo solid state limiter but it has only a yellow dot on it and no other markings. Any ideas as to how I can come up with an adequate replacement part?
It was built in the early 70's to the best of my knowledge.
 

bryce Goggin

New Member
Rare Stereo Limiter

Yes Roger only made a little bit of outboard. I did once see his console at a studio near grand central station.
This is a sweet limiter.
I got brave today and stuck a 512-BC547 NPN 45V in place of the bad transistor. We had just ordered a few for our BA183 cards.The new transisitor works pretty well It sounds great but the channel with the new transistor drifts up and down 2.0 db every 5 minutes or so I have to tweak the output level.

http://www.electro-tech-online.com/custompdfs/2009/05/BC547.pdf
What would cause drift?
 
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