I use a NOS telefunken 12AT7 on my VTL mono block 125'S sound great. I also would look at the mullards NOS I also use these tubes in my VTL . I think these are the best choice for this amp.
Mullards - available from the Parts Connection, on sale until October 31. cheers, Samuel Johnston P.S. They meet spec which is more than I can say for the Pentas that Luke Manely uses.
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