audio-talk

Mike H wrote: ↑Thu Jan 23, 2020 12:32 am Top hole. ....

steve s wrote: ↑Thu Jan 23, 2020 11:21 am It would be good to hear it Steve, I too have found what I think is a much better amp than the a20, but im sure people will laugh when I say it's built around the tda2030 chip..
I've owned them for a few years, but eventually give them a try a few months ago.. pretty good in my view.

I've been trying to build an off the net circuit, quite unsuccessfully !.. to see if the sound is recreatable.... I think I'm going to end up copying my originals when I get a chance though.

I've been planning a new valve amp and been back and forth deciding which output valve to use... still not really settled on it.. going back to one power supply.. as a tester, but with an unconventional smoothing arrangement as valve amps go.
I have picked a mains transformer with multiple by taps so switching between choke and cap loading will give a wide HT range, I think I may settle on 250vt globe px4s for testers
Let's see..

Nick wrote: ↑Tue Jan 21, 2020 1:41 pm For a reference work Self or Cordel would be my suggestion. Probably and instead of or in the last sentence.

Cressy Snr wrote: ↑Thu Jan 23, 2020 4:17 pm

I can bring “The Clone” to your place when you’re free if you want to hear it on your speakers.

steve s wrote: ↑Thu Jan 23, 2020 6:37 pm

Cressy Snr wrote: ↑Thu Jan 23, 2020 4:17 pm

I can bring “The Clone” to your place when you’re free if you want to hear it on your speakers.

That sounds like a plan Steve, can we give it a few weeks.. I'd like to get this valve amp finished and, unfortunately, I'm starting a kitchen refurb at Lesleys daughter's next week, I expect that to take 2-3 weeks, it puts a large spanner in the works regarding my social life..

Cressy Snr wrote: ↑Tue Jan 28, 2020 1:12 pm Thought I’d put the electronic finishing touches to the amp yesterday and fitted 1uF film cap bypasses to all the power supply caps. I sat back, cued up a record and prepared to be enveloped on sonic bliss. Instead I got sandpaper and grit for treble and the whole tone of the thing was completely fooked up. Took them out and returned to liquidity and music.

I’ve never had much sonic success with bypassing PSU electrolytics, the sound is always degraded, despite what other people say. The only real success was with the output caps on the OTL, where the improvements were quite marked.

Cressy Snr wrote: ↑Tue Jan 28, 2020 1:12 pm I’ve never had much sonic success with bypassing PSU electrolytics, the sound is always degraded, despite what other people say.

Cressy Snr wrote: ↑Tue Jan 28, 2020 1:12 pm I’ve never had much sonic success with bypassing PSU electrolytics, the sound is always degraded, despite what other people say. The only real success was with the output caps on the OTL, where the improvements were quite marked.