Power tube pairing in a roadster

[scruffydoo]

So I brought my roadster to Aus from the UK pretty unscathed except for developing a loud swirly crackle, I changed the preamps one at a time to try and find a culprit but everything was ok, having pencil tested the power tubes the middle 6L6 pair crackle on tapping, so I guess they didn't survive the journey. Question is can I just swap the inner pair or do I need a full quad? I also have a busted rectifier tube (the plastice locator pin cracked), can you swap these in singles or do they need to be a pair?

cheers doods

 

[ANIMATED SUSPENSION]

Just replace the inner pair, they don't have to be a matched quad. The rectifier tubes can be replaced singly.

 

[scruffydoo]

thanks buddy