Retubing difference in MARK IV Version A and B

[webstersp]

I bought a Mark IV short head on ebay and I'm not sure if it's a version A or B (haven't receive it yet)
I want to order new tubes but I have read somewhere (can't find where..) that there were at least one of the
preamp tubes that should be different in them...

Anybody can help me on this before I order my tubes!?

 

[GD_NC]

Any chance you can post a picture of the back panel? It's pretty easy to tell them apart from the back.

& yes there is one preamp tube that is different. The B uses all 12ax7's the A has one 12at7 in V4

See: http://forum.grailtone.com/viewtopic.php?f=27&t=5987

 

[webstersp]

The only picture still on the link where I bought it is this one...
This looks like a B version...

 

[Fronzil]

ye thats a B

 

[Shep]

4x6L6's
4x12ax7's
1x 12ax7 matched triode's.


Easy AAS