Will a jj7027a tube break my amp

[rouss]

Its a fender blues delxe re-issue 40 watt , It normally takes 2x6l6, can they be substitted for jj 7027 and will this change the tone

[MrSleepy]

A 7027 can be substituted with a bias change ..the 7027 require -60 to -65 v..

So your amp would need to be biased to -60 odd ish..I'm not sure if you can get to those values in the fender bias circuit.

I would expect it to change the tone..not sure what to though..but I'd guess the same sort of characteristics as a 6550.. very clean then metallicy overdrive.
Ampeg chose them for their tone and ability to stay clean when pushed.

Rob

[Prairie Dawg]

Originally Posted by rouss

Its a fender blues delxe re-issue 40 watt , It normally takes 2x6l6, can they be substitted for jj 7027 and will this change the tone

The JJ 7027 is exactly the same as their 6L6GC, except it has 2 more pins-1 and 6. If your amp does not use pins 1 and 6 for anything like a transfer point, you can use them and be happy-They're no different. Most Ampegs that featured 7027s didn't have pins one and 6 wired for anything anyway.