2:90 users!! When you need to replace 3 preamp tubes inside?

[nexus]

Hi!
Does anyone know how long those preamp tubes inside 2:90 are ok?
What they do?
It´s time to change power tubes and need to know if those has to be replaced too.
They are here in Finland about 25e/tube, so there must be good reason to replace those tubes.

I use this unit every day, from 1hour to 6...

Thanks!

 

[thunda1216]

I generally don't replace any tube until it starts making noise or quits working...

ty

 

[PG13]

I kind of heard the same thing... leave them alone until an issue arises. In my case, I purchased a used 2-90 on e-bay and decided to re-tube it entirely to be on the safe side.

 

[nexus]

Thanks!

How about those power tube match codes???
What is the tube order at the 2:90, i have 4 different colors now... i got last tubes from our mesa-shop here
so how to place those tube pairs?