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Original Message

RE: Dynaco 400 left channel crackles when furnace cycles

Posted by ttone007@gmail.com on December 11, 2016 at 11:46:08:
Hello again Dynaco folks,

Well, I still have had the low level lefty channel furnace cycle noise after all these years.

Now my older of the two Stereo 400's has a constant low level static or crackle in the left channel. This noise goes away by turning down it's input pot. So I'm guessing I'll be diving in on the PC29 card? I have already done the Vishydale resistor mods on both amps back in 2008 on the PC28 cards.

I guess I should re-cap and re-semiconductor all three cards (both pc28s and the pc29)plus the PC30 while I'm in there? I can get all the parts from our ebay source: quy-co. I also have the uprated relay kit from updatemydynaco standing by.

Anything else to consider here?

Thanks! Mike