In Reply to: From a practical standpoint... posted by mls-stl on July 15, 2012 at 08:38:46:
"...it's impossible to have a tube DAC where the analog portion of the signal does not spend time in a solid state device. The digital to analog conversion takes place inside of an integrated circuit and comes out as an analog signal."
Perhaps it amounts to counting angels on the head of a pin, but the digital pulse train created by the switches in a DAC chip are just that, digital. Depending on the way the DAC is implemented, there may be no transistor in the chip that sees anything that looks like an analog audio signal. (As one example, consider a 1 bit DAC where the digital pulses come out of the chip unchanged in form from the way they were input. The analog signal appears only after this pulse train has been filtered and this could be done externally, even by passive components.)
If the I/V circuitry is inside a DAC chip (an optional mode for some) then I would agree completely with your comment.
Tony Lauck
"Diversity is the law of nature; no two entities in this universe are uniform." - P.R. Sarkar
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Follow Ups
- RE: From a practical standpoint... - Tony Lauck 08:54:43 07/15/12 (13)
- RE: From a practical standpoint... - mls-stl 09:30:40 07/15/12 (1)
- RE: From a practical standpoint... - Tony Lauck 10:33:59 07/15/12 (0)
- RE: From a practical standpoint... - Dynobot 09:00:49 07/15/12 (10)
- RE: From a practical standpoint... - Tony Lauck 09:27:13 07/15/12 (9)
- The Philbrick model K2-W, the first commercial vacuum tube operational amplifier back in 1952. - cfb 12:09:30 07/15/12 (1)
- Thanks for the link! nt - Tony Lauck 12:29:46 07/15/12 (0)
- RE: From a practical standpoint... - Dynobot 09:32:06 07/15/12 (6)
- RE: From a practical standpoint... - John Swenson 17:49:34 07/16/12 (0)
- Keep in mind... - mls-stl 10:21:19 07/15/12 (4)
- 1961Vacuum Tube Op-Amp - Tony Lauck 12:23:16 07/15/12 (2)
- RE: 1961Vacuum Tube Op-Amp - rick_m 17:19:13 07/15/12 (1)
- RE: 1961Vacuum Tube Op-Amp - Tony Lauck 17:44:00 07/15/12 (0)
- Got it...thanks!..nt - Dynobot 10:23:34 07/15/12 (0)