My god did these tubes wake this thing up! I loved my Fireball as soon as I got it. No frills in your face gain machine. I was however having problems cutting through with a whole band. Typical Fireball problem. I read somewhere that 5881's in a fireball would take care of the issue. So I bought a Tung Sol 5881 duet. It took the Engl type gain that was already there and gave it this mid range growl! I've done quit a bit of experimenting in my days with different tubes in different amps and got to see the differences from tube to tube, but I have never heard such a dramatic change. Mind you the 6L6's that were in there were Boogies, which I'm not a fan of unless they are in a Boogie, but I didn't think they were spent. Now, I didn't have it re-biased yet. I just wanted to her the difference. I used it at rehearsal last night and now I'll bring it to my tech to re-bias and maybe put in bias points and a trim pot on the outside of the chassis so you can get to it without pulling the chassis out. I'm in love with this thing all over again.
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