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Old 24th March 2011, 12:50 AM   #21
Dr Zeus is offline Dr Zeus  United States
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Yes the following transistors are testing out just fine:Q19, Q20, Q21, Q22, Q23, Q8, & Q16.

Q10 just lost Leg one while I attempted to de-solder it. Unfortunatly I dont exactly know what AG / QW is other than guessing it to be a BCX52-10 PNP driver. I put an MPSA56 TO-92 in place of where the BCX52-10 driver was, twisting the base and collector legs of course. MPSA56 I believe is the closest to the BCX52-10 I have.

Unfortunatly that didnt help the problem.
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Old 24th March 2011, 01:17 AM   #22
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AG could also be a 2SA1797.

I didn't think about this before. This is a self oscillating amp. The waveforms aren't likely to be normal unless both high and low side outputs are in the circuit.

If you install all of the outputs and clamp them to the sink, how much current does the amp draw?
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Old 25th March 2011, 02:11 AM   #23
Dr Zeus is offline Dr Zeus  United States
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With all the outputs installed, the amp draws less than 5 amps to power and play. It is stable at this point.

Now it is time for me to order all the parts!! The amp will need the following;

L7912, L7812
L7915, L7815
2SA1797 (Confirmed)
12x IRFP064N
12x 47ohm gate resistors
5x IRF9640
5x 10ohm gate resistors

Question: I've been using an MPSA56 in place of Q10 on the driver board, where an AG transistor broke off while I was de-soldering it. The amp seems to be working just fine with the MPSA56 but since I'm ordering I might as well pick up a 2SA1797. Would te MPSA56 work though?
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Old 25th March 2011, 02:16 AM   #24
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I'd order the correct part.

Don't forget about the list of transistors in the 'semiconductor datasheets' folder that begin with 'transistors marked...'. The AG was in that group.
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