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Crunch P1500.1
Crunch P1500.1
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Old 7th August 2014, 02:17 AM   #1
S Merlington is offline S Merlington  United States
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Default Crunch P1500.1

Anyone have a pic of the circuit board around the drivers in the output section of this amp?

Or know the value of C20?
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Old 7th August 2014, 02:25 AM   #2
Perry Babin is offline Perry Babin  United States
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It appears to be the same as the attached board. If so, it's a 470pf.
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Old 7th August 2014, 02:27 AM   #3
S Merlington is offline S Merlington  United States
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Thank you for the info..

Can i replace it with a disk cap ?
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Old 7th August 2014, 02:30 AM   #4
Perry Babin is offline Perry Babin  United States
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Yes. It's a ceramic cap (same as the disc capacitor).
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Old 7th August 2014, 03:21 AM   #5
S Merlington is offline S Merlington  United States
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Ok replaced the capacitor..

Amp powers up but no sound..

I have + - 15 volts on power supply pins of all op-amps..

I have both positive and negative rail voltages 55 volts

I get rail to rail oscillation

I get audio on all op amps

but still no output..

Any ideas?
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Old 7th August 2014, 03:25 AM   #6
Perry Babin is offline Perry Babin  United States
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If you have rail-rail oscillation, there's a problem.

Was that capacitor removed by someone or did it appear to be left out by the manufacturer?
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Old 7th August 2014, 03:30 AM   #7
S Merlington is offline S Merlington  United States
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It was taken out by someone
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Old 7th August 2014, 03:31 AM   #8
Perry Babin is offline Perry Babin  United States
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Are you sure that it's oscillating?

If so, remove the cap to see if it stops.
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Old 7th August 2014, 03:44 AM   #9
S Merlington is offline S Merlington  United States
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Ok i will have to get some resistors tommrow morning this amp just self distructed on me..

I will replace all resistor that smoked and post back when i get it completed
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Old 7th August 2014, 03:06 PM   #10
ultra is offline ultra
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If you need any pics,i have an identical amp on my bench.
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