Counterpoint SA-100 Repair

[anatech]

Hi flex2,
Many thanks. I have the tube section sorted, the second stage was being starved as you know. It performs extremely well now, but I'll have a look at what you've done. I'll never miss an opportunity to learn something!

I'm just making the solid stage output section perform better. I'm using a power diamond buffer.

 

[konst]

@anatech, how you getting on with those conversions? Ready for a retail product?

 

[konst]

I experimented with these amps a lot. There are a number of design goofs (worse than mistakes). I came up with a version that was reliable, ran much cooler, had much lower noise and distortion, plus the DC offset became stable without wandering all over as is normal. It required a total redesign keeping the original basics, four new PCBs to replace the original one. I separated the power supply, voltage amp stage and each output section got a PCB. No more mosfets. The folks I made prototypes for strongly preferred the new version and these people LOVE Counterpoint. I have a bunch to do once I finalize the new design.

Let's have it 🙂

 

[anatech]

Well, it would be a set of PCBs. Possibly a few new mounting holes in the chassis. Lot's of development required, so little time.