Hi all!
I am in the process of DIY'ing a pair of 6550 p-p monoblocks based on the Mark III.
For the driver stage I want to use the venerable 6SL7 tube. After tinkering around with paper, pen, SPICE and Matlab I converged to the circuit shown below.
The attached simulation shows the open loop gain of the SRPP/phase splitter stage The simulated input voltage is a pure 1kHz tone with 2 volts of amplitude.
I have a few questions:
1) Is the voltage swing enough to drive the 6550 assuming a line level input of 1.41 volts RMS ?
2) What'd you prefer for the CCS LM334 or LM317?
I'd very much appreciate your comments.
Cheers!
--Rodrigo.