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Old 18th February 2013, 10:37 PM   #1
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Default MTX Thunder 8302

Amp powers up but no output..

Amp produces + and -32 volts of rail and + - 15 volts of regulated voltage


Any ideas on where to start?
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Old 18th February 2013, 10:45 PM   #2
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Confirm that you have both positive and negative supply voltage on all of the op-amps. There are resistors in the supply lines that sometimes open.
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Old 18th February 2013, 10:51 PM   #3
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I have + - 15 volts on all op-amps..
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Old 18th February 2013, 10:53 PM   #4
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Does operating all switches and pots through their entire range make a difference (absolutely no sound, not even static/noise being produced by the amp)?
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Old 18th February 2013, 10:58 PM   #5
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I got the amp to produce some sound but very very low output..

Last edited by S Merlington; 18th February 2013 at 11:01 PM.
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Old 19th February 2013, 07:26 AM   #6
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Drive a strong signal into the amp and see which op-amps have audio on their output pins and which don't.
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Old 23rd February 2013, 08:14 PM   #7
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All of the NE5532 op-amps have signal on the output pins..

Both TL074's have signal on PINS 1,8,14 but the signal looks distorted..
there is no audio on pin 7
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Old 24th February 2013, 01:17 AM   #8
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See post above any ideas?
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Old 24th February 2013, 01:25 AM   #9
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With the black probe on the emitter and the red probe on the base, what is the DC voltage on Q303?
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Old 24th February 2013, 01:33 AM   #10
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0.60 volts
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