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Old 9th November 2018, 07:21 PM   #21
imraneesa is offline imraneesa
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Quote:
Originally Posted by Perry Babin View Post
So, is the maximum output from both channels 3v AC?
yes both channels have only maximum 2.8v~3v ac on outputs.
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Old 9th November 2018, 07:26 PM   #22
Perry Babin is offline Perry Babin  United States
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That's very strange that it's clean but low.

What is the DC voltage measured directly across R206 and R306?

Do you see essentially no signal on either side of C301 and C204?
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Old 9th November 2018, 07:40 PM   #23
imraneesa is offline imraneesa
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Quote:
Originally Posted by Perry Babin View Post
That's very strange that it's clean but low.

What is the DC voltage measured directly across R206 and R306?

Do you see essentially no signal on either side of C301 and C204?
There is no voltage across R206 and R306.

C301 and C204 has slight signal on negative side.
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Old 9th November 2018, 07:46 PM   #24
Perry Babin is offline Perry Babin  United States
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I've never seen clean audio pass with no bias for the differential amp. Do the bias pots do anything?

If not, post the DC voltage on all terminals of the LM339.
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Old 9th November 2018, 08:01 PM   #25
imraneesa is offline imraneesa
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Originally Posted by Perry Babin View Post
I've never seen clean audio pass with no bias for the differential amp. Do the bias pots do anything?

If not, post the DC voltage on all terminals of the LM339.
There is nothing happening when bias pot is turned. here are the voltages;
Pin1 20.1v
Pin2 4.6v
Pin3 11.7v
Pin4 0.3v
Pin5 2v
Pin6 4.9v
Pin7 4.9v
Pin8 3.9v
Pin9 4.9v
Pin10 4.9v
Pin11 7.3v
Pin12 0v
Pin13 4.6v
Pin14 4.6v
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Old 9th November 2018, 08:12 PM   #26
Perry Babin is offline Perry Babin  United States
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DC voltage on all 3 legs of Q10 and Q11?


Set the bias pots fully CCW so the bias won't be too high when the bias is restored to the differential amplifier.
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Old 9th November 2018, 08:25 PM   #27
imraneesa is offline imraneesa
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Quote:
Originally Posted by Perry Babin View Post
DC voltage on all 3 legs of Q10 and Q11?


Set the bias pots fully CCW so the bias won't be too high when the bias is restored to the differential amplifier.
Q10
pin1 0v
pin 2 20v
pin3 0v

Q11
Pin1 0v
Pin2 -20.2v
pin3 0v
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Old 9th November 2018, 08:30 PM   #28
Perry Babin is offline Perry Babin  United States
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It looks like Q10 has bad connections and may be defective. The collector should be at about 15v. The base is at 20. That should make the emitter about 1/2v below the base.
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Old 9th November 2018, 08:48 PM   #29
imraneesa is offline imraneesa
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Originally Posted by Perry Babin View Post
It looks like Q10 has bad connections and may be defective. The collector should be at about 15v. The base is at 20. That should make the emitter about 1/2v below the base.
lm339 pin1 was 20v now i am not getting 20v on pin1 again. R37 has 20v on one side other side is 0v.
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Old 9th November 2018, 08:51 PM   #30
Perry Babin is offline Perry Babin  United States
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The 20v side of that resistor should connect to the collector of Q10. Find the break between them.
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