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RE: Thoughts on red-plating a tube?

Posted by boeingpilot (A) on May 21, 2015 at 10:43:59

In Reply to: Thoughts on red-plating a tube? posted by boeingpilot on May 21, 2015 at 10:15:16:

Ok, may have answered my own questions..... (or may have generated more questions!)

Looked closely at the PCB, found the land had pretty much lifted and possibly started to melt attaching to the coupling cap. (see pics, sorry for bad picture). So, either this is the problem, or I have multiple problems. You can see that the board has seen better days. It's sort of coated with waxy coating that I suspect is the board going bad. And there are several other lands that have started to lift.

So, fortunately I have a spare ST-70 to use, but now have to decide what to do with this one. The spare has new PC-3A (7199) driver board. Do I just get another (I do obviously have good 7199's), give up and get a PC-3B (6GH8's) or something else. Joe Curcio's? VTA's?

And I was just starting to like this amp (again!).

Back to the red plating, opinions, did I find the issue, or are there more?

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