CS50 PSU Parts
2014-10-17 by bob@...
Got a bad supply in a CS50.
Power supply had broken free and trashed the innards, which have been repaired, but now I'm getting a high pitch whine under all the audio, and the sound in general is a bit lumpy.
Visible cyclic noise on the power lines. Seems to be the +/-15V lines. as it's still there if I remove the fuses for the other lines.
Have changed some bits in the PSU which has lessened the issue, but it's still there.
Anyway...I'm looking for replacements for the power transistors.
I can find a 2SA745s, but there don't seem to be any 2SD203s in circulation.
What are a good complimentary pair to use instead?
Anyone have a suggestions?
Of course I could be barking up the wrong tree and the problem may be elsewhere.
Power supply had broken free and trashed the innards, which have been repaired, but now I'm getting a high pitch whine under all the audio, and the sound in general is a bit lumpy.
Visible cyclic noise on the power lines. Seems to be the +/-15V lines. as it's still there if I remove the fuses for the other lines.
Have changed some bits in the PSU which has lessened the issue, but it's still there.
Anyway...I'm looking for replacements for the power transistors.
I can find a 2SA745s, but there don't seem to be any 2SD203s in circulation.
What are a good complimentary pair to use instead?
Anyone have a suggestions?
Of course I could be barking up the wrong tree and the problem may be elsewhere.