#1
Hello!

I just took possession of an Ampeg J-20 Jet and I have to say it's a tone lover's dream.

It came with metal covers on the preamp tubes. The hang tag's feature outline says "Padded steel tube cages prevent damage during transport."

My question is this: I can see that they can be removed. Should they be removed to promote heat dissipation? Should I have not played the amp with the tube covers on?

Anyone have experience with this?
#2
It's up to you. Although my amp kept going from really quiet to ridiculously loud volumes on its own after I'd played it loud for anywhere over 20 minutes, I tried taking the preamp tube covers off and haven't had a problem since.
A dwarf might hear you. What then?

My Music
#3
^^ Thanks for the anecdote. I think that's good enough for me. I'm taking them off. I can only assume the covers could prevent heat dissipation and help the tubes overheat. Probably what happened to your amp. Good to know it hasn't troubled you since.
#4
I'm sure that was just a coincidence. I've had my tube covers off and on with my 2205 and there was no difference. Do a little research and you will find there is nothing wrong with keeping the covers on. If you are worried about heat, get a small fan and set it behind your amp.
#5
Heat dissapation is improved with them off, durability and security is improved with them on. *shrug. It's gravey to me; I leave them on, 'cause I'm lazy.