swapping rectifier tubes

[AL1]

Can the GZ34 rectifier tube be changed to a 5Y3 in a deluxe reverb reissue with out doing anything other than rebiasing? Would a GZ32 or 5V4g be a better choice.

[THLH]

Yes, just rebias. You CANNOT use a 5Y3 with 6L6's because of the extra voltage. This is straight from David Allen at Allen Amps. I'm running my Old Flame (much like a Deluxe Reverb) with 6V6's and a 5U4 right now. Because the 6V6's have a lower voltage, just about any rectifier tube will work with a minor rebias.

[Red Planet]

I just purchased a Tweed Proluxe from Steven Gupta and it has 6L6's and a 5Y3GT rectifier in it. Can you put a GZ34 in it to undo some of the SAG.

[Blue Strat]

http://www.kcanostubes.com/Rectos.html

Lot's of '50s tube PA amps used 5Y3s with 6L6s. The reason this may not work would be CURRENT, not voltage. In any case, it will work for a while....likely a long while.