What age is my Solo head? Can I use 34's?

[tennisplayer]

serial number is: S-50 00539
I do not see a switch to switch from 6l6 to el34's, so I'm assuming it can't be done?

 

[fluff191]

You are correct. Bias switching has never been an option on the 50 watt head.

 

[muramasa]

I'm pretty sure my Series II single rectifier had a switch for 6L6 or EL34....

http://www.mesaboogie.com/Product_Info/Rectifier_Series/The_Single_Rectifiers/The_Solo_50_Head/the_solo_50_head.html

Yup that ^ link says you can, right hand side 2nd feature down.

So that means you have a series I single rectifier, and the first series didn't have a bias switch.

 

[fluff191]

Oh yeah I forgot about the second series. First ones you can't, second series you can.

 

[muramasa]

Oh yeah I forgot about the second series. First ones you can't, second series you can.

No matter, you're right anyways.

 

[clutch71]

Fluff didn't you do the adjustable bias mod on a 3 ch? In theory wouldn't this work on the SR series 1?