New or Old DAC

I don't know. There may still be a conspiracy unfolding....at the very least, some real chain-pulling – and at worst, truly gross conceptual error…

Life IS too short for (this) type of behavior….

Huh? What are you talking about, Ben? Or are you just trying to be inflammatory?

-- Al

Al, it appears as if Ben is replying to Pettyofficer's 2nd post on 9/15/09. I give Ben credit if he can read through all that stuff, he's a better man than I am. I saw a wall of hieroglyphics and just gave up.

I think you cleared it up well Al, and I think it's now time to put this thread to bed. I now wish I had just bailed after my first reply.......sigh. Apologies to Mikedaniels for turning this thread into another mess. That's why I suggested to search the archives, this mess happens quite a bit with many questions, including this one.

Cheers,
John

Like John says…

I guess I neglected to include the Insert-Humor-Here tag; albeit inflammatory humor.

Almarg-

"The Rectifying Stage Circuit IS the Power Supply, and it is an Analog Circuit"

Then if the Rectifying Stage Circuit IS the Power Supply, and it utilizes Tubes, then Jmcgrogan2's claim that no-one uses Tubes-fancy Caps-or Resistors in the Power Supply for Digital Stages is completely bogus. Is there supposed to be a separate Rectifying Stage for both Analog
and Digital Stages? Can no-one see the contradiction, or did I.Q.'s just drop sharply on this Thread? A Rectifying Stage, that uses Analog circuitry, to convert AC to DC, whose DC Output is never the less NOT Analog based- what is so difficult to understand about this? Am I going too fast for everyone? S-h-o-u-l-d I s-l-o-w i-t d-o-w-n f-o-r e-v-e-r-y-o-n-e? Maybe if I took the Vacuum Tubes out of the Rectifying Stage of my DAC, and shoved them in Jmcgrogan2's dark place. Then broke them off, perhaps then he would get the point that they are NOT simply part of my imagination! Try Rectumfying that! Almarg- what are you trying to tell me- that no DAC in existence can utilize Vacuum Tubes in its Rectifying Stage as a Power Supply to its Digital Circuits? And you agree with Jmcgrogan2 in this regard? If you really are an EE, I would suggest that you stick to working on Solid State circuits, because you are apparently as clueless as Jmcgrogan2! Where do I get off of this Flat Earth Society Thread anyways?

Almarg- what are you trying to tell me- that no DAC in existence can utilize Vacuum Tubes in its Rectifying Stage as a Power Supply to its Digital Circuits? And you agree with Jmcgrogan2 in this regard?

No, I did not say that, and you are quite correct that audio components of all kinds can and often do utilize tube-based rectifier stages/power supplies, which in some components may supply power to digital as well as analog circuits.

JMCGrogan2: Remember, no one puts tubes, fancy caps or resistors in the digital to analog convertor, these premium parts go in the analog output stage.

Pettyofficer: Sorry to disagree, my Space Tech Lab DA-64XT DAC utilizes an STR-104 Tube Rectifier. This Rectifier does have two very, very large Tubes that supply power to all of the components within the DAC.

Again, I think there is a misunderstanding here. You (PO) were referring to the DAC component in the sense of the entire component, while John was referring (I believe) to "digital to analog converter" in the sense of the dac circuit or chip within the overall component (as distinguished from the power supply within the overall component). Notice his reference to the analog output buffer stage (as distinguished from the d/a converter stage), which would seem to confirm this interpretation.

Then if the Rectifying Stage Circuit IS the Power Supply, and it utilizes Tubes, then Jmcgrogan2's claim that no-one uses Tubes-fancy Caps-or Resistors in the Power Supply for Digital Stages is completely bogus.

If that is what John meant, then yes, he was clearly wrong. But I suggest that you consider the possibility that, as I indicated immediately above, he was using the phrase "digital to analog converter" in a different sense than you interpreted it.

Regards,
-- Al