On January 19, 2014 at 19:49, highfigh said...
RE: phono preamp, that won't work when it's off, but it's possible that the switching for sources, volume and tone controls are passive and that's something I hadn't thought of before. I have a Sony ES integrated amp that has all passive switching/volume and tone controls. I had it modified so it would have preamp out and when I shut the power amp off, I was surprised by the fact that the sound didn't stop.
The sound didn't stop from the REC OUT or from the PRE OUT, or both? If the switching is passive, it could come out the REC out when power is off. But the volume control is after the switching in the circuit path, then there's the line level amp (of a preamp) that gives you the PREAMP OUT. If audio goes through with the power off, then it should be lower in level and distorted, because it's just leaking through powered-down circuitry.
Look at Art Audio- IIRC, they have at least one with a level control and I'll find another brand in the next day, or so- I installed one, but don't remember what brand it is.
By which you mean a preamp with one pair of inputs and one pair of outputs, intended to amplify and RIAA equalize the output of a phono cartridge. Right? That's what I was talking about.
