preamp tube replacement (Diezel Einstein combo)

[guitar_face]

Hi

I want to replace a preamp tube or two. I know in how to do it in theory I guess but physically I worried I'll damage the tube. Never done this before as you can probably tell.

So I've take the cap/spring loaded cylinder off. Do I also take off the preamp tube 'ring' that surrounds the tube? I've tried to put the tube in without taking off this ring but haven't put any force into it as I don't know what I'm doing basically.

So do I take off the surrounding ring or not?

Any other tips?

Much appreciated

thanks

EDIT; when I tried to put it in I was aware of the arrangement of the pins, so that's not a problem.

 

[guitar_face]

bump

It obviously applies to pretty much every other tube amp out there, I shouldn't have mentioned what kind of amp it is.

So if anyone here uses tube amps please answer my simple question.

Thanks