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In Reply to: RE: This is what is gong on... posted by Balle Clorin on March 25, 2016 at 09:08:28
That is a wonderful curve, within 2 dB !
Second order distortion is a valve amp charasteristic, higher orders are ss charasteritics and very nasty.
Avoid valve amps with more than 10 dB overall feedback, then 2-nd order distrotion is very low.
I get the impression that your music collection is made of very bad compressed CD's or vinyl.
If the curve is your amp it looks very good. Do not call your amp "euphonic" just because you miss the ultarbright artificial ss crossoverdistortion/TIM you're probably got used to.
Follow Ups:
So here is the actual mesaured frequency reponse in Voltage dB at speaker terminals, Nice for a 300B I think,I love the sound but one cannot deny the frequency drop off of 1dB that must be audible.. the secondd figure is the inroom measurement with Tranistor(green) vs 300B (Blue) tube amplifier using a calibrated Umik microphone..
Edits: 03/26/16 03/26/16 03/26/16 03/26/16 03/26/16
Thanks for your information.
Indeed the source impedance matters, heavy feedback compensates for a non linear curve. Nevertheless measurements do nothing for me, loudspeaker amplitude curves, room influences are bigger issues.
My Magnepan MG1-c with a little tweak on the filter has an impedance of 5 Ohm on every frequencie. As there is no EMF feedback to the amplifier Valves or Solid State work almost or entirely the same, yet I prefer my valve amplifier, in my case without feedback. Natural sound, various Solid State amp in the past all had their own sound, from good to very bad. Even a single ended 6BQ5 amp at low volume sound musical and natural versus Solid State amp's.
I wish for a solid state amp with good sound, cheaper, easyer, no expensive valves to replace, etc. but never found one.
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