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In Reply to: RE: How high is "up"? posted by 1973shovel on January 20, 2016 at 07:43:56
You are not kidding about the tubes, assuming they still work!
Dave
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It also has a Mullard GZ34, I don't know it's value. And their are two 7199 marked Dynaco Made in the USA. These items are all original.
As far as working I'm first bringing the ST70 up on a Variac over say 48 hours (I hope that is OK). Than the PAS Preamp and Tuner. I'll than plug them together and see what I have in sound.
They were basically one step from the dumpster.
Anyway to clean the dirt off of the tubes without damaging the stenciling.
I would change the electrolytic capacitors in everything before I brought them up on a variac.
Dave
There is no safe way to clean the tubes and spare the silkscreening. Just try to clean as much as possible around the print.
Even if you keep the tubes I would have them checked. Rare or not they may not be any good.
How are the sockets? Obviously clean the crap out of them. And remove and reflow all the solder joints. Consider replacing the important cathode resistors and just redo the bias circuit. It's too old, important and simple to just leave.
Download some of the trouble shooting tips from Joe Curcio's page on how to bring it up and test things like transformers before retubing it.
Also again, I would consider a new driver board. Those originals did tend to rot.
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