Been a while....
A little confused on pre-amp out cap values.
I have a ARC LS7(circuit schematic) which has 2.0uf o/p cap bypassed with 0.01uf. (stock)
The power-amp has an input Independence of 150Kohms (unbalance) and 100Kohms (balanced).
I use it unbalanced.
Reading an old thread on Pinkfish re upgrading the LS7 the suggestion was to increase the o/p cap values to 10uf (better l/f response).
The V-Cap CALCULATOR suggests the opposite and o/p cap value of 0.53uf!!I would try:
1. Increase output cap to 10uF, put something in the level of Mundorf MCap Supreme or similar.
2. Replace the old-fashioned high-voltage regulator with the very best one you can possibly put together.
3. Split high-voltage power rails to L,R, input-stage and output stage, total of 4 regs.
4. Consider reducing the gain by changing FB resistors.
I have briefly re-read Morgan Jones' Valve Amplifiers who suggests the same, a much lower value. (Jones seems to suggest partly it is a cost reason).
Why?
Surely as wide a frequency response is what one should be looking for so 5hz (2.1uf), better than 20hz (0.53uf)? Though I do note the V-Cap argument about too much capacitor can effect sound.
Any thoughts?