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Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
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Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
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In Reply to: RE: I had a nice talk with Doc Hoyer. posted by Caucasian Blackplate on February 25, 2015 at 17:45:37:
Good point
You may have to adjust R30 but that is very easy to do because Mac amps work on the bias tracking which goes up or down with the plate B+ on the tubes.I set all my Mac amps up with a variac and a voltmeter..Take an Mc60.After a rebuild and changing the old selenium out to a silicon you just run your variac up until you have 435vdc on the plate and you want minus 47 on G1..If if's higher than that,you just change the resistor feeding the C minus voltage until you get minus 47v.It may be minus 45 but I go for minus 47.
"For every complex problem there is an answer that is clear, simple, and wrong" H. L. Mencken
Edits: 02/25/15
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Follow Ups
- It is a curious thing, as the plate voltages are going to pop up, but not the bias supply voltage - Michael Samra 18:33:43 02/25/15 (0)
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