Power tubes in MKIV

[six20aus]

Okay so I fukd up pulling out one of the middle power tubes and it was so tight the glass came loose in the base. Off to buy a new set. Can I use one of the old outer tubes in the middle slots safely ? Theyre all Mesa branded 6L6 GC tubes so I assume there's no problem with that. I have only ever used it in tweed triode A class mode.

Ie. buy one set of two for the outers and move one of the old ones to the inner set.

I assume its safe but just checking.

 

[six20aus]

Okay now I'm confused. Put in two new red 6L6 GC mesa tubes and the volume seems to have dropped on R2 and across the board. The old mesa 12ax7's glow but the two new ones I put in V1 and V2 do not is this normal ?

No more squeal when I engage the loop anymore anyway.

 

[Tuna141]

The volume drop may be due to the new preamp tubes that you installed - they may simply be lower gain or one may have a problem. Try putting the old ones back in and see if the volume comes back.