[Biff]

Man, don't tube roll when you're tired. 

I didn't do any damage by doing this, did I?

Thanks, all.

[AVnerdguy]

Most likely not. In 20 sec. it barely had time to get to operating parameters.

[Biff]

Thanks. So what would happen eventually? Would the tube probably fail or would it take the whole unit with it?

I wish I knew more about this sort of thing.

[AVnerdguy]

I briefly looked up the pin outs but I didn't look at any of the operating voltages. They are similar and that is a good thing as you didn't put plate current where it shouldn't be, high voltages etc.. I would think (but I'd have to look at it longer) that you'd damage the tube 1st if the operating voltages were significantly higher in one than the other. Again, I just quickly looked at it to give you a quick answer so you wouldn't have to fret about it. I think you're OK. I'll look at it some more later and see if there was anything vital I missed. Have you tried it since the inadvertent swap?

[Biff]

I appreciate that.

Yeah, I'm listening to it right now. Seems fine. Nice sounding unit.

This is the second bullet I've dodged but the first one was hairy. I put a 12AU7 in that must have had a short. It took out one channel of my amplifier, but the Cornet came through okay. I checked all of the voltages on the board (with a good 12AU7 of course), and they were correct. No DC at the outputs either. I was REALLY sweating that one.

Bought a tube tester afterwards.

[AVnerdguy]

OK, the 5751 doesn't disipate as much plate pwr but it was only in there for 20 sec. so most likely it's fine. That would be the the most likely problem - it would have burned up rather quickly if left on too long. I think you're good - be careful out there

[Biff]

It did seem pretty bright. Heh heh.

I'll do that. Much obliged, my friend.

[AVnerdguy]

You're most welcome. I think I'd put that 5751 away and mark the box - use it for non critical applications/emergency etc.

[Biff]

Oh yeah, it could be used as a 12AX7 in a pinch, so I'm told.

[hagtech]

No damage.  It probably played fine.

jh