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With feedback...I get that you may get controll over the speakers better...But with the M60 if i add Any feedback I find anyone can hear the diff an it not good?....goodluck with any OTL that has to have feedback to work...Ralphs amp can be used to show people what feedback sound like...in a Min.
Other amps....i gess that dont sound right to start with....i am lucky that i like the sound of some...Pass Labs for one.
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Oddly enough Futterman circuit uses a lot of NFB as a matter of course, to keep it stable, I think. Yet when I listen to a Futterman, I don't hear much of a problem that I could ascribe to NFB. I never understood that.
Hi Lew !I must say next :
After spending many years repairing thousand of consumer electronic units , TV , Amps , Tuners ,VCR , etc , I have the unique chance to analyze and explore many SS Amps circuit to.
For me in many SS Amps repairing cases it was the obvious that early SS OTL Amps designers all over the world from the early 70`( Special from Japan ) are direct copied the original early Futterman OTL SEPP Tube amps design.
It`s funny but this old SS Amps from early 70` based on the original Futterman OTL SEPP Tube amps design usually follows all the original Futterman Amps circuits solution , like negative feedback loops , bootstrapping loops and many other specific solution from the original Futterman OTL tube amps from the early 70` , and they sounded quit good & acceptable even today ! Firstly never boring and with very precise defined bass sonics which is very pleasurable for human ear .
Usually the common mistake of this Futterman based SS Amps design copies from early 70`is that to they have very poor designed PSU , but that`s was the Amps mass production era symptom ,on today mass production `` HI-FI`` market is even worse !Best Regards !
__
Enlightened Evolution-Astral Projection
Edits: 12/10/11
Maybe it the CircLotron!......it was a lab type amp in the 50s....if it the diffamp setup....maybe feedback shows more of the diffrenc in the R+R-....L+L-....
As the amp output is set above ground=Earth.....But in most other amps it dose the trick...I have a amp here that i diyed 50-60watts maybe, 2 KT88..with 440B+on the plates...An i have feedback it the amp,it runs UL outputs....sounds sweet...it must make the THD walke the line...Funny but put feedback in the M60s...nite an day....I have most speakers set up to run good on low power tube amps...The ML Ascent i have in now,as all ESL
dont let much by...good are bad....an i have rework the ESL panels an get an get 3-4 more db output of them..... M60s plays loud! But i like the transfourmer type amp sounds...feedback..In audio if you dont put it in you setup you dont an wont no....
As Ralph knows, I have been interacting with some of the old crowd from the SLOG website (Sound Lab Owners Group, now defunct). We have done some stuff with the SL crossover and audio step-up transformers that make the spkr way more efficient and much higher in impedance, therefore much more friendly to OTL or any other tube amps. I am listening to my modified 845PXs now. Sound is fabulous.
Vary cool, I got into the SoundLab A1 interfaces...An got a bout 3db more output..just as i did with the Acoustats... Martinlongan had already done.
But i got out of the A1s...Move on to two way ESL to get more output...
I like what the ESL panels do from 200hz up..to each his on.
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