Music Man 6L6 or EL34 ?

[drewl]

Anyone ever use 6L6's in a music man 2275-130 which originally has 6CA7's?

Even though it runs the screens at half the plate voltage I'm a little hesitant to put modern EL34's in an amp with 700 volts on the plates.

Are the output transformers different in the different versions?

[The Dude]

You might consider permanently wiring it to half power mode (half power switch that uses a different x-former winding). If not, it'll be a tube eater with modern tubes of most any type.

[Lee_ranaldo]

You can try E34L's from JJ/TESLA. I read on many places that they were the a good substitute for 6CA7's on musicmans. Running the amp on low power mode will reduce the overall voltaje of the amp
including the heaters which "could" reduce tube life.

[pdf64]

'Running the amp on low power mode will reduce the overall voltaje of the amp including the heaters which "could" reduce tube life'

From http://schems.com/manu/musicman/musi...&_2275-130.pdf it looks like the version with a tube phase splitter uses a switched primary (thereby reducing all secondary voltages), whereas the version with op-amp phase splitter uses a switched B+ winding, which would leave the heater supply pretty much unaffected.
Unfortunately there's no indication with either version what the 'Lo' voltages are; does anyone have that info?
Pete

[g1]

I'm pretty sure the engineers would have used a compromise for safe heater voltages in the switched primary models.
With the increase in modern line voltage, I would be more concerned with heater voltages being too high on the high power setting.
I think with current line voltage, the lo setting will have heaters closer to 6.3V than the high setting will.