I have been working on making a drop in replacement PCB for the old B&K ST-140 amplifiers for several months now, and I after several revisions I have got a decent sounding amplifier. I would like someone to look over my work and give me ideas for improvements. I would like anything from mechanical ideas to circuit design layout.
I just recently bought several amplifiers to compare to my upgraded B&k amplifier. I bought a KST-150 and a topping LA 90. Both of these are supposed to be high performance amplifiers for the money and to my surprise the B&K amplifier blew the doors off both of these amplifiers as far as musicality and emotional engagement.
I am currently trying to order a Quant QA403 audio analyzer to do distortion and other testing on my diy projects but they are currently back ordered.
I am using the original power supply but with new kemit 20,000 uf caps. So 40,000uf total.
I'm getting about +63 and -63 VDC on the rails.
Please feel free to give me any suggestions I'm all ears.
I just recently bought several amplifiers to compare to my upgraded B&k amplifier. I bought a KST-150 and a topping LA 90. Both of these are supposed to be high performance amplifiers for the money and to my surprise the B&K amplifier blew the doors off both of these amplifiers as far as musicality and emotional engagement.
I am currently trying to order a Quant QA403 audio analyzer to do distortion and other testing on my diy projects but they are currently back ordered.
I am using the original power supply but with new kemit 20,000 uf caps. So 40,000uf total.
I'm getting about +63 and -63 VDC on the rails.
Please feel free to give me any suggestions I'm all ears.
Attachments
I forgot to mention I put a RC zobel filter on the output of the amplifier. 8ohm and .003 uf.
The input cap is 5uf, the cap I have in the schematic is 47uf.
The cap in the feedback is 200uf in the schematic it shows 47uf.
The input cap is 5uf, the cap I have in the schematic is 47uf.
The cap in the feedback is 200uf in the schematic it shows 47uf.
I made a aluminum adapter plate to hold the exicon MOSFETs. The plates bolt directly to the heat sink using the original holes.
