Digital Drive

Upsamplers, DACs, jitter, shakes and analogue withdrawals, this is it.

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RE: From a practical standpoint...

Posted by Tony Lauck on July 15, 2012 at 08:54:43:
"...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.