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Old 13th December 2002, 12:21 PM   #1
diyAudio Member
Join Date: Nov 2002
Location: South Korea
Angry I met unreasonable unbalanced status!!

I'm a Korean, live in seoul South Korea, and like DIY of audio amps.

I have a 300B SE power amp, which was DIYed by me past.
Recent days, I made its B+ down to 320 volts for tubes' life.
However, it causes two channels to be unbalanced.
A right channel has a triple greater output level than left.

What can I do for the balanced operation of the power amp?


my Email: gokhl@dreamwiz.com
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Old 13th December 2002, 01:11 PM   #2
dhaen is offline dhaen  Europe
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Join Date: Jun 2002
Location: U.K.
Hi Gokhl, welcome to the forum.

I'm not clear about the channel imbalance:

Do you mean that when 1 channel is outputting 1 volt, the other is outputting 3 volts? That's a 12dB imbalance!

What was the original +B voltage?

If the amp uses manual bias, you will have to adjust this.

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