audio-talk

First you need a DAC that is DSD capable, if you want to enjoy "real" SACD sound from some sort of digital input. If you are interested just in standard digital output (PCM 16 or 24 bit), some BluRay players that are SACD compatible will have PCM digital output through SPDIF. Some will pla...

No need to put ashes on your head... there is nothing wrong with your amp - besides the unnecessary additions like the diode "isolating" the driver from the rest of the amplifier (and the power supply). The best way to build a good amplifier is to follow a known (or expected) good schemati...

As far as I know, ultrapath represents a capacity divider that acts as voltage divider in AC terms, injecting a precisely defined quantity of hum into the circuitry (at cathode level, g+1) in order to cancel hum. No, thats not ultrapath. Ultrapath does exactly the same thing as a normal cathode bip...

Either no one was reading, or no one wanted to indulge, but the diode that conducts both ways bait was not grabbed. This probably means that everyone here knows that diodes to conduct AC both ways if the frequency is high enough. Thus more high frequency was passed in the feedback loop than low freq...

That's feedback. Steve, I just noticed your 100nF cap and 200k which is -3db 7hz. Aren't amps with feedback meant to have zeros down at 1hz? You would need 700nF or nearest equivalent 1 uF. Tabor is DC, which you started out with also didn't you? Is it worth backtracking? Being in the feedback loop...

Changes from last schematic: Series resistors feeding EL34 screen regulator now make up 7K2 6U4G TV damper diode isolates power stage from driver stage, ensuring only one route for plate to grid feedback. This is not correct. Once heated, the diode conducts. Both ways (!) and the resistance is obvi...

Thanks Alex, appreciated, but that highlights to me that your real interest is amplifier design possibly not out and out sound quality, or maybe just a lack of funds? My interest in amplifier design dates back to my childhood. Instead of becoming an engineer I became an economist - its the damnatio...

What speakers do you use alex to assess your amplifiers.? At home, Heybrook Sextets (SEAS woofer and mid with Tonegen ribbon tweeter). The speakers are between 88 and 90 dB/W/m efficiency. I have made recently slight modifications to the crossovers, as explained in more detail in this thread: http:...

I did not get the "self promotion" part, but it does not matter. No? must be me then. Maybe I should alter my sig to point to my own opinions. I would like to stress the fact that my signature links to my design work and not my opinions. I seldom post opinions , I prefer stressing out fac...

No Nick, I did not build the Aurora. And I do not intend to.

I did not get the "self promotion" part, but it does not matter.

And you don't have to worry about me, I can manage myself quite well... as my post above points out, I don't intend to waste time in pointless discourse.

How stupid I was... it took me years and years to get to the truth! 1) People know little or nothing, while I imagine they do know something and start by giving them credit for what they are not. 2) I come late, so people are already fascinated by what they have been told previously. Thus their opin...

Are we talking differences in micro-dynamics, or bass dynamics ? Most PP amps seem superior in bass dynamics to SE amps unless the SE amp has a shunt-regulated supply . In microdynamics it can be the other way round . On the other hand the Aurora that I built , and Gary P's 47 PP amp were as dynami...

Quite unbeliveable disrespect to one of the most intelligent and nicest guys in the business - who also happens to be a professional electronics designer in the US. This is exactly the kind of reply Iam soooooo sick and tired of! Unfortunately, you never met me, so you cannot say anything so nice a...

I'm replying mostly to stay on topic. I am not satisfied with the example proposed, because from the very beginning technical inconsistencies are shown, as well as incorrect or imprecise explanation of the work being done. Also, lots of current source symbols without explanation of the actual circui...

You are not missing anything - but the feedback resistors you are mentioning, between the anode of the driver and the anode of the output tube on each phase. Without those resistors, you could choose to have a common resistor on the two drivers (as well as the two output tubes), and as a matter of f...