I'm actually curious about this. Except my my amp has 5 Pre-Amp valves, but I'm also after 6L6s with 12AX7s. I play very similar music (drop tuned metal) and was curious as to what valves I could use in mine. Below is the pre-amp stages.
V1B -Input and first gain stage both channels
V1A, V2B, V2A, V3B, V3A - Cascaded gain stages for lead channel
V4B - Tone stacks both channels / fx send
V4A - Driver for the Phase splitter
V5B / V5A - Phase splitter
I was thinking mabye:
1) A Tungsol for V1, with JJs for V2-V5.
Or mabye:
2) Tungsols in V1 & V2, with JJs in V3-V5
Or even:
3) JJ in V1, Tung Sol in V2-V3 and JJs again in V4-V5
What would people suggest?
Also could somebody please explain what the 'Driver' for the Phase Splitter is for, as well as 'Tone Stacks' for both the channels?
Cheers