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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
sebrof's avatar
sebrof
837 posts
 
Just got the amp and tubes yesterday. I'm breaking in the power tubes, the 5751, and amp before I start rolling. I'll try to remember to post back in a few days.
doak
199 posts
 
12AT7 and 12AX7 are NOT "interchangable."
sebrof's avatar
sebrof
837 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
6,171 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.
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