Can someone recommend a good op amp that can run on a potentially noisy 6.3V tube amp heater supply?
So desired / required characteristics are:
- Single supply < 6.3V (although I think the 6.3V is RMS so the real voltage might be more like 8.9V)
- Very good PSRR
- Low noise (so preferrably bipolar and not something like "LinCMOS")
- Unity gain stable
- Decent power necessary to drive possibly long cable
I want to create a rack mount unit with a bunch of tube preamps and I need to buffer the output using probably a simple inverting op amp stage with a very large Ri / Rf ratio (like 1M / 10k) to step down the ~230Vpp of the vacuum tube anode to ~2.3Vpp on the op amp output.