JJ-7591 Special Considerations?

[Snapcase]

http://datasheets.electron-tube.net/...127/7/7591.pdf

[Gitarman]

7591's

Has anyone ever tried 6v6's? They may sound closer to the 7591's?
And i would not have to rewire the amp...

[soundmasterg]

7591's are a sensitive tube just like an EL84, so they have a fair amount of gain on their own. If you have an amp designed for them and you sub in 6V6's, you will not have as much gain and will probably have to revoice the preamp and/or phase inverter for more gain. Moreover, the 7591 will put out more power than a 6V6 and sounds really nice too. A very balanced tube. I would stick with 7591's myself.

Greg

[Gitarman]

thanks,

I will give it a try.
As i bought the amp because i sat in one night, on someones else's gemini and it was an eye opener as to the sound.

[telemoxy]

Yes, guys. You're right. But the real thing, in a real scenario, (onstage), the Gemini I cannot keep up with the Deluxe or Atomic performance levels. With those two amps I can play along with a loud drummer without a problem. But not against my band mate with a Sovtek Miget 50, an Ampeg B25, an Ampeg V2 or a Hiwatt DR103 (tamed to 50w). I need my B25 or my Soldano SL60 in that band. But for my solo project, I want lower powered amps. 20 watters are just perfect but though I love the tone, the Gemini I falls short against a drummer. Do you think modern 7591s are guilty for that? Would things improve with NOS tubes all the rest beign equal? Any other idea? I need a little more volume from my Gemini.

In a numbers of other threads with posts from owners of your amp they all eventually settled on Weber Blue Dogs Ceramic speakers. If you are curious, try a search for threads that refer to Ampeg, 7591A, Gemini, Reverberocket and Mercury etc. They mention a number of mods to bring the gain up and cut through the band.

Good Luck

[Gitarman]

tweed deluxe 6v6 to 7591?

This thread sounds interesting to me.
How about, has anyone tried to change over a tweed deluxe to 7591 tubes.
I know some guys would frown on this but if you have a non original one. also it would be easy to change back.
sometimes the tweed deluxe is a little too flappy.
just a thought. has anyone tried it?