#1
So, I just bought a Fender Champion 600 and I'm gonna change the tubes. I was thinking a 6SJ7 for the preamp (that's what the vintage ones had) and I'm not sure what for the power amp. Any ideas?
#2
You're not going to be able to put a 6SJ7 in that amp without extensive modification. A 12ax7, 12ay7, 5751, 12WD7, or 12DW7 are all decent options for your preamp tube.

The output tube, you better keep it a 6v6. The cathode resistor is pathetic and any larger tube would destroy it, which could really hurt your output transformer.
#3
Quote by end_citizen
You're not going to be able to put a 6SJ7 in that amp without extensive modification. A 12ax7, 12ay7, 5751, 12WD7, or 12DW7 are all decent options for your preamp tube.

The output tube, you better keep it a 6v6. The cathode resistor is pathetic and any larger tube would destroy it, which could really hurt your output transformer.


What about a 6V6GT? (As you can probably tell, I know nothing about tube amps)
#4
6v6=6v6gt nowadays. The 6v6gt was a revision to the 6v6 back in 1962 (I think that year is right...). Now they just add letters to the end as a marketing ploy. Just look all the different letters they put at the end of 12ax7: 12ax7C, 12ax7B, 12ax7A, 12ax7WA, 12ax7WC, 12ax7R, 12ax7EH, 12ax7R2, 12ax7R3, etc...

These are all tubes that could be made on the same machine with the same materials. The same is true with 6v6GT, 6v6EH, 6v6R, 6v6S, 6v6C, etc. The letters at the end actually meant something when they were developing new types of tubes. It meant it was a newer revision. Now they add letters hoping people won't know that they are the same.