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Old 27th May 2013, 10:00 PM   #1
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Default punch 601s bias

Anyone know what the bias voltage should be for this amp?
Can the bias be set with just one working channel?
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Old 27th May 2013, 11:05 PM   #2
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It should be at 0 vdc across the source resistors.

The working channel should still bias properly.
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Old 27th May 2013, 11:39 PM   #3
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0.000? When I have it set there I get distortion at low volume.
With black prob on amp main ground and red prob on the gate of PS FETS I get 10.58v.
Is that ok for this amp?
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Old 28th May 2013, 03:17 AM   #4
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With Blaco probe on Ground termianl of the amp what voltages do you get on all 3 legs of the power supply fets??

Leg 1:
Leg 2:
Leg 3:
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Old 28th May 2013, 12:12 PM   #5
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I think the voltage on the gate is to high but the fet is not geting hot
Leg 1:10.58
Leg 2:12.38
Leg 3: 0.00
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Old 28th May 2013, 10:48 PM   #6
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Usually you would see 4 or 5 vdc on the gate legs.
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Old 28th May 2013, 10:51 PM   #7
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Some of the newer amps I have worked on will have distortion in a good channel if there is a bad channel.

Some of the protection circuitry could be damaged.

To set the bias watch your amp meter on your power supply. Screw the pot clockwise just until it starts to draw current then back it off till the current draw goes away. That will be good enough for this amp.
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Old 2nd June 2013, 04:37 PM   #8
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Can I used a 2A transistor in place of a 2G?
I don't remember what this amp had.Its the drivers for the power supply FETs.
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Old 3rd June 2013, 11:26 PM   #9
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You can use 2A or 2G, the 2G has a little higher current handling.
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Old 28th January 2014, 03:01 AM   #10
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Any one no in what location the PS drivers go,I took all out and don't remember
where the 1A or 2A goes .A pick will also do.
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