[quote name='dannybuoy' timestamp='1395899379' post='2407682']
You'd have to try it I guess! Depends whether the DI is too hot because of the V2 tube itself, or because the V1 tube is feeding it too hot a signal. Perhaps it's a bit of both.
If I had to guess, I'd say changing V1 would make the gain knob range more usable, and changing V2 would lower volume through the fx loop and DI.
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In which case, if it were I, going by the diagram above, I'd try a 5751 in V1 and V2 and a 12AX7 in V3 and if the DI signal was still too hot, try a 12AU7 in V3 instead. This combo ought to give both more headroom and reduce the DI signal.
G.