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In Reply to: RE: I think i found the problem posted by Triode_Kingdom on April 18, 2016 at 16:31:16
You were right, it was the pot. I changed out the caps and there was no change so I decided to remove the bias adjustment pot and it measures bad. So, next thing it trying to find a replacement. Thanx TK.
Follow Ups:
If you don't find a replacement pot at the usual sources like Mouser, Digikey, etc., also try Surplus Sales of Nebraska. They have a lot of unusual items that can't be found anywhere else.
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Buy Chinese. Bury freedom.
I went with a linear 25k pot by Allen Bradley. It seems to work great. A setting of -150 is about 3/4 travel. An according to the front amp meter is about 100ma of plate current. Is that a good operating point for just above 1000v on the anode?
1KV @ 100 ma - you're at the maximum plate dissipation rating of the tube. That's too much. I wouldn't run it past 80W, or 80 mA if anode voltage is exactly 1KV. Some people would probably consider 70W the limit for good tube life.
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Buy Chinese. Bury freedom.
How does one calculate the dissipation for this amp with fixed bias? regards, Dak
Plate dissipation in watts is plate to cathode voltage times current.
Tre'
Have Fun and Enjoy the Music
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