Bill13
100+ Head-Fier
- Joined
- Jun 22, 2004
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Rob,
You mentioned two caps in the direct signal path. Are these two caps polypropylene, or other kind of high quality caps for audio?
By "usual two caps" do you mean one cap used for the output stage's input, and the second cap used for the Qutest audio output (output stage to the RCA jacks).
If two caps are used in the audio path, do I understand correctly that a DC servo is not used to enable direct-coupled audio output for Qutest?
Thanks, Bill
You mentioned two caps in the direct signal path. Are these two caps polypropylene, or other kind of high quality caps for audio?
By "usual two caps" do you mean one cap used for the output stage's input, and the second cap used for the Qutest audio output (output stage to the RCA jacks).
If two caps are used in the audio path, do I understand correctly that a DC servo is not used to enable direct-coupled audio output for Qutest?
Thanks, Bill
It's a discrete class A OP stage. One feedback loop and the usual two caps and two resistors in the direct signal path. The OP07C are merely the analogue integrators for the digital DC servo; they are not in the audio path, and only influence the DC on the output. It takes 16 seconds to get DC to be nulled out by the digital servo, that's what is happening at power up during the rainbow display mode.