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12at7 with 12ax7 tubes

Greetings and Happy Easter,

This post has probably been answered before at some point. I have a Symphonies pre V2 that uses three 12ax7 tubes along with a 6x4 rectifier. I wanted to know if I could use a pair of 12at7 tubes for the output section with no ill effects. Thanks to all and good listening.
south43
doak
199 posts
 
12AT7 and 12AX7 are NOT "interchangable."
sebrof's avatar
sebrof
835 posts
 
Thanks Doak.
So much for that experiment.
south43 OP
386 posts
 
I beg to differ. The links given do state that these tubes are interchangable. I have done this as mentioned in my setup with no ill effects. Of course Sebrof the decision is your call. Good listening.
rodman99999
6,132 posts
 
Actually, there are some semantics involved, as the 12AX7 can be replaced with a 5751, 12AT7 or 12AY7, but the 12AT7 can only be replaced with a 5751 or a 12AY7. ERGO, "interchangeable" may not be the correct word.
tomcy6's avatar
tomcy6
2,589 posts
 
Rodman or anyone else, have you actually substituted 12AT7s for 12AX7s or other swaps mentioned in the links?

It would be great if we could swap tube types but the Tube Store writeup says:

"These substitutions can also work in home audio amps, but we don't recommend trying this unless you are having trouble finding the correct tube type for your amp."
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