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In Reply to: RE: Qualities that depend on the recording posted by morricab on November 06, 2023 at 06:44:37
"like dynamics and soundstage when a rectifier is swapped on a tube amp...yes the rectifier for the power supply and it is scarily obvious"
Can you explain? Does one rectifier tube produce more voltage? More current? Just what about the two rectifier tubes are different? I assume you mean swapping between two tubes of the same type?
What if the raw supply output voltage is regulated before reaching the audio circuits?
Thanks.
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
Follow Ups:
No, I cannot explain and yes, I am talking about two tubes of the same type.
For example: I have a Marconi (made in Canada) 5U4G and NOS Svetlana Winged C Russian equivalent. In addition, some friends brought over another Marconi 5U4G (but from a different country and looks somewhat different inside), a new Czech made KR Audio anniversary 5U4G and one other one I can't remember.
The Canadian Marconi clearly had better soundstage and imaging 3d, better tone as well with more of the sense of the players "being there" than the others. The KR was surprisingly forthright and direct but losing a lot of what made the Marconi special. THe RUssian one made things sound a big flat (relative to the others) and grey tonally. The other Marconi was sort of in the middle somewhere.
Technically, they all spec the same and are lightly used tubes, so not a case of one being worn out (plus these rectifiers last a LONG time). The voltage drop should be the same (we were also rolling 5R4GYs and 5AR4s as the amp in question will work with all three types). The other rectifiers we rolled also sound very differnt from each other and that could partially be due to voltage drop differences affecting the bias settings on the tubes.
However, we heard similar differences Intra-tube type (as I described above for the 5U4Gs)...the three 5AR4s I had on had sounded quite different from each other as well as quite different from the 5U4Gs. The best one was the 1955 Valvo metal base (very expensive and for good reason).
The best 5U4G was the Marconi (Canada) and the best 5R4GY was a 1940s RCA Blackplate, which sounded more similar to the Marconi than the Valvo.
While the inter tube type could be in part explained by the voltage drop, this cannot be the cause of the sound differences in the same tube type; nonetheless the difference is profound and easily repeatable.
I still shake my head in disbelief. However, the power supply is in the circuit path in a way. So, whatever small differences in distortion, voltage drop or whatever there are...matters.
"nonetheless the difference is profound and easily repeatable. "
Would you say easily heard in a double blind test?
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
I would think yes, but of course this wasn't done. Do you need that to accept what you hear?
I know that our ears and brains are easily fooled. Many things do influence what we think we hear. We are not in control of these things.
View YouTube Video
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
What is your point exactly? I know you are into tubes and I am pretty sure you have been rolling them in your life... Did you not hear the obvious differences when rolling?
I have done blind tests on interconnect cables and we were able to essentially always spot not only if there was a change but once revealed which ones were which, going back blind could tell WHICH cable was installed.
That was more subtle than a lot of what I heard with rectifier tubes.
For sure the differences can be my imagination...so can all of so-called "reality" for that matter. I listen to long term impact and so if I am fooled it is over months and consistent. I could prove it to myself with blind tests but don't waste my time anymore with such things. I hear what I hear, whether real or imagined and I choose my preference.
It is intersting though that we are talking about mass delusion though. Most of us hear the same thing...how much we like or dislike it is subjective.
.
Have Fun and Enjoy the Music
"Still Working the Problem"
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