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MTX Thunder 8302
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Old 24th February 2013, 02:44 AM   #11
Perry Babin is offline Perry Babin  United States
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Do you see audio on the base of Q301 or Q201?
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Old 24th February 2013, 02:59 AM   #12
S Merlington is offline S Merlington  United States
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Join Date: Jun 2012
Yes i see audio on both Q301 and Q201..

Amp is producing audio on the output terminals but is very low and distorted
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Old 24th February 2013, 03:02 AM   #13
Perry Babin is offline Perry Babin  United States
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Do the bias pots work like they should?

When properly biased, does the amp produce normal audio?

Is the audio on Q201/301 clean?
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Old 24th February 2013, 03:10 AM   #14
S Merlington is offline S Merlington  United States
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Neither bias pot works ..

If i turn them the current draw does not increase at all
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Old 24th February 2013, 03:19 AM   #15
Perry Babin is offline Perry Babin  United States
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The base of Q303 goes to the bias pot. From the bias pot, there is a resistor that goes to the negative rail. Find that resistor.
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Old 24th February 2013, 03:26 AM   #16
S Merlington is offline S Merlington  United States
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R349 and 249 are both defective..

They are 47.5 ohm resistors..

Should i check anything else before i put new ones in and power the amp up?
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Old 24th February 2013, 03:37 AM   #17
Perry Babin is offline Perry Babin  United States
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I don't know how they're being used. I think that they are part of the bias circuit but I'm not sure.
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Old 26th February 2013, 07:13 PM   #18
S Merlington is offline S Merlington  United States
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Replaced R249 and 349

Bias pots still dont work correctly..

Any ideas where to go next?
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Old 27th February 2013, 01:39 PM   #19
Perry Babin is offline Perry Babin  United States
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Location: Louisiana
Post 15?
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Old 3rd March 2013, 01:53 AM   #20
S Merlington is offline S Merlington  United States
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Join Date: Jun 2012
If the 0.22 ohm resistors are bad would that cause the amp not to Bias and burn up other resistors in the channels ??

Because i was checking them off the board and all 16 of them read 5.75 mega ohms
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