Hello,

Can someone explain to me how a solid-state constant current source would be
added to a Mullard-style LTP phase splitter? My amp is similar to an Eico HF89,
which is a Mullard 520 knockoff that uses a 6SN7GTB for the phase splitter (a
schematic can be seen on Ned's site at http://www.triodeel.com/eicohf87.gif).

The amp is fixed-biased, so it already has a -50V source that I could utilize
for the CCS. If the 18K cathode resistor is replaced with a CCS, I assume that
the plate resistors would need to be balanced (currently, they are 27K and 33K).
Should the grid of the 'lower' triode be grounded directly, instead of through a
..25 cap?

Thanks for the advice,
Jim