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previous: Charles Two things happen on those amps. -- 3/14/1999 10:25 PM

Re: Newbie: hum problem

3/15/1999 10:31 AM
Giacomo	Re: Newbie: hum problem Charles I replaced the Hum Balance pot with two 100 ohm resistor. No good news for me, hum goes on. I tried the "quick & dirt" OT method, but I think that my analog VOM multitester has too high resistance, in fact I find 20-22ma for each group of three 6L6. Furthermore when I attempt to measure the current across each OT's half the hum decrease very much. I guess that much of the current go through the meter. I should now measure the idle current of each tube. Is it the same of "cathode resistor" method? Giacomo

3/15/1999 10:31 AM

Giacomo

Re: Newbie: hum problem

Charles

I replaced the Hum Balance pot with two 100 ohm resistor.
No good news for me, hum goes on.

I tried the "quick & dirt" OT method, but I think that my analog VOM multitester has too high resistance, in fact I find 20-22ma for *each group of three* 6L6. Furthermore when I attempt to measure the current across each OT's half the hum decrease very much. I guess that much of the current go through the meter.

I should now measure the idle current of each tube.
Is it the same of "cathode resistor" method?

Giacomo

Replies:

Bruce Yes. If you have room, install a 1%... -- 3/15/1999 9:09 PM