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previous: Bruce J Re: Interactive Volume Hum Increase -- 2/8/2003 12:35 AM	View Thread

Any ideas on how to minimize this?

2/8/2003 6:54 PM
Jason A	Any ideas on how to minimize this? Guys, Yeah, either channel on it's own is fine. I measured approx 50 millivolts of hum/hiss on the speaker terminals with the tone control and bright volume up 1/2 way. When I activate the "unused" volume, it peaks at about 200 millivolts. It is fairly loud. In a band/practice situation, this is not a problem. However, if I were to use the amp for quiet passages in a recording situation, I woudl have to resort to a noise gate or filter. Yuck. I'd like to figure out how to minimize this hum on this circuit. I don't believe it is the tubes [I have swapped out many and have roughly the same measurements]. I am using the artificial CT [100R's from 6.3VAC secondary leg to ground]. There is no difference between connecting this to the 6V6 cathode [DC+] or ground. I was told to use the brass gound plane instead of the 3 point star ground setup. Any ideas/opinions? Jason

2/8/2003 6:54 PM

Jason A

Any ideas on how to minimize this?

Guys,

Yeah, either channel on it's own is fine. I measured approx 50 millivolts of hum/hiss on the speaker terminals with the tone control and bright volume up 1/2 way. When I activate the "unused" volume, it peaks at about 200 millivolts. It is fairly loud. In a band/practice situation, this is not a problem. However, if I were to use the amp for quiet passages in a recording situation, I woudl have to resort to a noise gate or filter. Yuck. I'd like to figure out how to minimize this hum on this circuit. I don't believe it is the tubes [I have swapped out many and have roughly the same measurements]. I am using the artificial CT [100R's from 6.3VAC secondary leg to ground]. There is no difference between connecting this to the 6V6 cathode [DC+] or ground. I was told to use the brass gound plane instead of the 3 point star ground setup. Any ideas/opinions?

Jason

Replies:

Bruce /Mission Amps Is this a homebrew 5E3 or someone's... -- 2/8/2003 8:06 PM