Rebel 30 won't bias to 40mA

  • Thread starter Thread starter laughingal
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laughingal

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My Rebel 30 head will not allow me to bias the 6v6 tubes past 30mA. The EL84 bias to 40mA just fine.

Anybody any idea what the problem could be?

I depend on this amp.
 
Are these the original tubes or new replacements? What brand are they? Was there a problem with the previous pair? FYI, even at 30mA, each tube is idling at 15mA, which is just fine. You can use the amp like this until we figure out what is going on after you perform the test below.
Do this:
1) Put in only one 6V6 tube and measure the test point. Leave the other socket empty.
2) Now put the other 6V6 into the same socket, still leaving the other socket empty, and measure the test point again.

What did you read each time in the above two tests?
 
Thanks, it was a duh on my side. It's good now. Appreciate your response.
 
Not to embarrass you but.....I have seen people have issues measuring the bias. Would you mind telling me what you were doing wrong so I can possibly help others who may make the same mistake?
Did you have the meter set to measure something other than DC volts?
Thanks
 
Hi Bruce - once I read the print on the circuit board and realized that the amp is supposed to be biased in mV (not mA), I biased the amp successfully and have been bathing in streams of tone ever since.

So . . . it was my duh, I am embarrassed, but that's ok. A little humility now and again is good for the soul :)

BTW - I think it's a class act for you to interact directly with users of your brand equipment. Can't say I've ever seen anything like it before.

Scott
 
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