In Reply to: RE: BTW- Vintage Power Amp with Passive Pre posted by Eli Duttman on July 14, 2012 at 18:04:49:
Eli,
Thanks for that tip about current capability in regard to cable capacitance.
I know enough to check for an output coupling cap, when using a single ended buffer. Plus, I have run into some other stuff when adding buffers. Stuff like muting circuits which work by shorting the output to ground. In my Onkyo TX870 receiver's preamp they put a 2500 ohm resistor in series to limit current from the linear IC at the output, so it could stand the muting circuits downstream of it. The power amp is nicely done; but the preamp is sort of a dog's breakfast of circuit elements. Don't even get me started on the CD input circuit - my rant on that atrocity could last past midnight.
Jerry
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- RE: BTW- Vintage Power Amp with Passive Pre - Bold Eagle 18:30:48 07/14/12 (0)