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RE: BTW- Vintage Power Amp with Passive Pre

The standard output for CD players is 2 volts; but the output impedance varies a lot. My Rotel CD player has a 75 ohm output impedance. 75k is a decent input impedance and you could use a 10k pot in between and not load down the output and have only a 12% drop across the pot with that player. On the other hand, I had a couple of Sony CD players that had output impedances around 1100 ohms. They would still work with a 10k pot; but the drop across the player's output impedance and the pot could be as much as 25%. That's still enough to drive the amp to full output, as it would take a 25% drop from 2 volts down to 1.5 volts to drive the amp.

More later, I have to go.

Jerry

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