Thanks a lot again. I have come to the conclusion that i cannot live without a remote controlled volume maybe without any V gain. But able to drive properly also low Zin power amps. I have this one in the scope ....I am using an attenuator cable. I specified the required attenuation to an engineer who made the cable for me (I am not an engineer)....
Hi John, it is based on this analog interface@pma you need to talk to us about your measurement system and the improvements. I am limited with my gear to pre AP system one numbers.
It would be interesting to see how it behaves on difficult loads (?)
I have a question and a request. The question is if this Yamaha amplifier shows any resemblance to the current AS501/701/801 series? The request is for a proper test of a Quad 606-2 or 909, if at all possible. Restorer John, do you have one?
Yamaha A-S801 Integrated Amplifier Review
The Yamaha A-S801 is an honestly rated 100 watt/ch integrated amplifier with a built in high resolution USB-B DAC to power a serious dedicated two-channel or upscale PC system with pristine fidelity.www.audioholics.com
Thanks, added it to the list below. I read about 110W in 4 ohms 1% THD+N, is that right?As I have some improvements in my measuring system, I have re-measured this vintage amp to get both THD and THD+N plots. The result is not bad and it would score respectably even in current @amirm power amplifier charts. Interesting.
View attachment 155212
and also in dB as used in ASR
View attachment 155213
... and THD and THD+N vs. frequency at 22W/4ohm with 40kHz bandwidth
View attachment 155214
View attachment 155215
Thanks, added it to the list below. I read about 110W in 4 ohms 1% THD+N, is that right?
Amplifier SINAD list ASR + 3rd parties
List Name,THD+N (5W, 4 ohms),SINAD (dB) (5W, 4 ohms),Power (W) (1% THD+N, 4 ohms),Price (USD),Source Topping LA90 (stereo, bypass, low gain),0.00009%,121,90,800,<a href="https://www.l7audiolab.com/f/topping-la90/">L7 Audio Lab</a>,Suggestions, corrections and more info here: Topping LA90 Discre...docs.google.com
It'd be nice to see power into 8 ohms please,
Also if you have more amplifiers measured and posted publicly please let me know and I will add them to the list. Thanks in advance.Thank you, staying on the safe side I would leave it at 110W/4ohm, even if I measured >130W/4ohm/1% earlier. I do not like the operation in clipping area with elevated high order harmonics.
There's still enough 'iffy' amps in use out there in subjectivist circles who still find all good measuring stuff is (benign) boring in sound, so PLEASE DON'T stop doing IMD testsOK, give me one more day please. I use the 4ohm as a rule for the reason that almost all speakers have impedance dips down to 4-6 ohms even if their rated impedance is 8ohm. I am a friend of worst case analysis.
Yes the 19+20kHz at high power was a killer in the past, but it helped us to understand how to design a reliable amplifier. For this reason, I like to see it even nowadays.