Promitheus, I have a few (3) white (pink ones are gone} PCBs available in Germany. If you are interested, PM me.
Cheers, Ernst
I am using two identical 25va(2x22v) amgis transformers(like 6L6 in the first post) for another project and the last days I have connected the transformers to a quasimodo jig to work out the snubbers.
The capacitor values were the same as the ones suggested by Mark and the resistor value came out 22r.
Just in case someone wants to try it out I would like to hear his opinion regarding the sound before/after implementing the snubbers.
The capacitor values were the same as the ones suggested by Mark and the resistor value came out 22r.
Just in case someone wants to try it out I would like to hear his opinion regarding the sound before/after implementing the snubbers.
I was answering that question. 
If you were talking about a PSU output snubber I'd suggest removing it and throwing it away. But a transformer snubber? All it will do is make the PSU even better behaved. That's always positive in my experience.
Wether or not it will actually have an impact on the sonics is for you to find out. Expectation bias will kick in strongly here, honestly, as the PSU is highly (almost ludicriously) well-filtered before the regulators, and the amplifier circuit's PSRR is pretty darn good.
If you were talking about a PSU output snubber I'd suggest removing it and throwing it away. But a transformer snubber? All it will do is make the PSU even better behaved. That's always positive in my experience.
Wether or not it will actually have an impact on the sonics is for you to find out. Expectation bias will kick in strongly here, honestly, as the PSU is highly (almost ludicriously) well-filtered before the regulators, and the amplifier circuit's PSRR is pretty darn good.
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Until now I have used these snubbers on the output of a transformer on a dac and now on a preamp. To be honest I have implemented them right from the start of the build process so I didn’t had a chance to make a comparison.
Today I had noticed that you use the same transformers as I use in my preamp and I thought it could be useful to share my info about the snubber for this transformer in the idea that maybe someone wants to implement it and after will share his opinion about the change in performance of his preamp.
Today I had noticed that you use the same transformers as I use in my preamp and I thought it could be useful to share my info about the snubber for this transformer in the idea that maybe someone wants to implement it and after will share his opinion about the change in performance of his preamp.
Modern metal film resistors are all very, very good.
I have used Vishay/Dale, Yeago, Xicon, thay all sound the same - very nice!!
I prefer the Dale because they are easiest to read and the value is written on the side instead of the color code.
Circuit sound is impacted much, much more by any active device than any passive component. (This includes capacitors.) If you want to experiment with sonic flavoring, try different opamps, they will sound different.
I have used Vishay/Dale, Yeago, Xicon, thay all sound the same - very nice!!
I prefer the Dale because they are easiest to read and the value is written on the side instead of the color code.
Circuit sound is impacted much, much more by any active device than any passive component. (This includes capacitors.) If you want to experiment with sonic flavoring, try different opamps, they will sound different.
Thanks for your reply.Modern metal film resistors are all very, very good.
I have used Vishay/Dale, Yeago, Xicon, thay all sound the same - very nice!!
I prefer the Dale because they are easiest to read and the value is written on the side instead of the color code.
Circuit sound is impacted much, much more by any active device than any passive component. (This includes capacitors.) If you want to experiment with sonic flavoring, try different opamps, they will sound different.
I also read about the experiments with the opamps and the various FETs.. Also about their (opamps) effect on the offset voltage. In your opinion, does the current capability of the opamp matter in driving the FET's, for they act as a capacitive load?
BTW, in case of excessive offset voltage, I remember reports of tenths of millivolts, is there a way of correcting that by means of a trimmer, without ruining the sound quality?
I plan to run the amp on somewhere around +/- 17V dc so a wider range of opamps can be applied.
greetz,
Edwin
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The typical offset is hardly worth adjusting out at milli volts or less.
You could trim the + inputs on the opamps if you wanted.
6L6 is correct about resistors most metal films are quite good. The Vishay/BC SFR25 are nice .4 Watt fitting in .5" spacing and cost about 5 cents. The Dales are nice if you want easy to read and non magnetic.
You could trim the + inputs on the opamps if you wanted.
6L6 is correct about resistors most metal films are quite good. The Vishay/BC SFR25 are nice .4 Watt fitting in .5" spacing and cost about 5 cents. The Dales are nice if you want easy to read and non magnetic.
Can I ask which Burson's you tried and what didn't work? Maybe the Muses or AD825.
I have a pair of metal LME49710's that I hope will work together.
I have reviewer's samples of the Supreme Sound V5 and V5i, neither worked unfortunately. The V5 produced a faint sound and the V5i didn't work at all. It's too bad as I really like the Bursons in a DAC i had previously. I need to confirm I was sent dual units as requested... will report back.