Does the capacitor in the C1 position need to be 0.33uF or is it possible to use slightly different values as 0.22uF or 0.47uF?
The reason I'm asking is that I just tried a little teflon capacitor bypass (2200pF) on the Solen 0.33uF and it definitly changes the sound. It tilted the sound upwards in frequency (not so good) but cured a little hardness in the sound that was noticable on a few piano recordings played at full tilt (very good). I have many 0.22uF and 0.47uF capacitors of different brands but only the Solen in 0.33uF.....
The reason I'm asking is that I just tried a little teflon capacitor bypass (2200pF) on the Solen 0.33uF and it definitly changes the sound. It tilted the sound upwards in frequency (not so good) but cured a little hardness in the sound that was noticable on a few piano recordings played at full tilt (very good). I have many 0.22uF and 0.47uF capacitors of different brands but only the Solen in 0.33uF.....
Can span that range without much phase margin alteration. 0.33uF is the midpoint best termination but that part's electrical properties play a role too
Just tried changing the Solen 0.33uF for a 0.47uF FT-3 Teflon and compared it with a 0.47uF Mundorf Silver Oil. Very interesting to say the least. The russian teflon cured the hardness and was almost perfect, soundwise, on piano music. The problem was that it sounded great but slowed down the music and lacked musicality. In fact the musicality was better with the Solen. I don't know the cause of this, but I suspect that the russians, relatively speaking, lacks microdynamics and perhaps have a less developed midrange. The Mundorf however was just as fast as the Solen with even more musicality and naturalness which silver always seems to bring. Harder on piano (for whatever reason) but pretty much better on everything else.
If the PSU is supplying DC that reacts quickly to changes in current demand and does not ring when the current suddenly changes, then any capacitors in the PSU should have no effect on the signal passing through the amplifier.
The fact that you are hearing changes in the performance of the amplifier tells me that the PSU is not operating correctly.
I suspect it has insufficient stability margins when presented with a fast changing current demand.
The fact that you are hearing changes in the performance of the amplifier tells me that the PSU is not operating correctly.
I suspect it has insufficient stability margins when presented with a fast changing current demand.
Maybe l do have insufficient stability margins, but that you can't hear differences between different capacitors is controversial.
hearing a change in the output of the amplifier when an amplifier capacitor is swapped may be explained by the different parameters of the two capacitors and what they are doing while operating inside the amplifier.
But changes in the PSU that result in a change in the amplifier output is not down to any controversial or otherwise effect of "hearing a capacitor".
It is telling you the PSU is not operating correctly and that incorrect operation is affecting the performance of the amplifier.
Find out what is wrong with the PSU and sort the error.
But changes in the PSU that result in a change in the amplifier output is not down to any controversial or otherwise effect of "hearing a capacitor".
It is telling you the PSU is not operating correctly and that incorrect operation is affecting the performance of the amplifier.
Find out what is wrong with the PSU and sort the error.
I don't have enough knowledge of the workings of electronics to say any more about the subject of "hearing a capacitor" in a PSU.
On the other hand I just realized that the big honking FT-3's I tried yesterday wasn't burned in at all while the Mundorf had 100's of hours on them, so the comparison wasn't fair at all. I will give them a thorough workout and listen some more. There is something luring about the "unelectronic" and smooth character of Teflon that you never forgets first you've heard it. I just wished for a bit more musicality... My V-cap Cutf took 600 hours to become stable, so perhaps the FT-3 needs a little time as well.
On the other hand I just realized that the big honking FT-3's I tried yesterday wasn't burned in at all while the Mundorf had 100's of hours on them, so the comparison wasn't fair at all. I will give them a thorough workout and listen some more. There is something luring about the "unelectronic" and smooth character of Teflon that you never forgets first you've heard it. I just wished for a bit more musicality... My V-cap Cutf took 600 hours to become stable, so perhaps the FT-3 needs a little time as well.
Does this also apply for Salas SSLV where quality/type of 4,7uf zobel output cap also impacts sound signature when regulator is used in gain stages?
Tian open loop gain plotting method says ~90deg phase margin for standard SSHV2 and ~100 deg phase margin for SSLV1.1 (when with 4.7u 1R Zobel). Those figures should be generally plenty enough.
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If it's not a stability issue within the PSU, then what is the PSU doing to the supply of current/voltage that makes the amplifier produce different performances?
There has to be an explanation for a different sound.
There has to be an explanation for a different sound.
If the Zobel stifles a propensity to ringing when a particular fast changing current demand arrives, then yes with or without could be heard because the ringing or no ringing might well affect the amplifier's performance.
Hymn, well it seems it does in SSLV. I did not noticed that in reflector. On the other hand it change the sound subjectively in a "good" way with specific capacitor. I actually chose SSLV for gain stage due to that. I could pick the zobel cap which I subjectively think sounded best. I could not do that with reflector, although it was sounding good as well.
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If it was oscillating it would be very high in frequency like MHZ. The DMM would be doubtful it could be sensitive enough to catch 56mV AC that high. When such oscillation its not in the scope, maybe its noise or some low frequency the DMM sees. Like hum. Sweep the timescale on the scope from end to end and if you can't also see it, its not verifiable.