A question concerning my current repair project of an audio amp that uses big (600 W) but otherwise rather classic complementary output stages:
I assume when testing an audio power amp with 6 pairs of paralleled npn/pnp transistors, it is o.k. to assemble just 1 pair while testing as long as you have no significant output load connected. The advantage would be that, while testing, I would not blow as many of the precius MJ15022/23 transistors I have available as spare parts.
In what ways (if any) will the bias current circuit be affected?
Any problems I may not have considered but may be important for this repair technique?
Any other really good tricks for fixing big amps?
Once I am closer to finishing the repair: Does 10…15 mA of bias current per transitor branch sound like a good number to you?
Best Answer
1 bank of 6 at a time ok. Bias not affected significantly. 10-15 mA plausible.