I have a Classic 50 410. Im not sure if it can run on 2 but I would think not because those are the power tubes. Another thing is that if you need an extra tube you might as well have one. I would check out some Sovtek tubes. Thats what I run and the amp sounds like a million bucks. Hope this helps.
I woudl not run any $ EL84 amp on 2 tubes...EL84's tend to run very hot and running only 2 of them could make a big problem in the long run...my advise, don't do it.
The real question is if you can get another amp for free if you F the one you have up by running two tubes. :laugh2:
Btw... how old is your C50? Mine uses the 4 x EL84 rig too but the new ones use 2 x 6L6. I'm pretty sure my amp is from between 1991-94.
/sigh I figured that's how it would be I was just crossing my fingers that it wasn't heh...
Oh well, I'll tell the guy to keep em unless he finds a set in his shop. My tubes will last me till Christmas I'm sure, they're just getting a little noisey. By then money will be a little easier to come by.
I just had to paint my car, run a new exhaust, did a tune up, and one of the axles went out so I'm having that dealt with right now. So yea, lol won't have much in the wallet for a little while, no worries though.