MA Preamp tube layout?

[Lizzy]

Sorry ask again if this was already covered in another post but what is the preamp tube layout of the MA100H? I presume the one next to the EL34's is the PI but not sure on the other 2.
SteveD, any chance you could also divulge what factory/manufacturer the Marshall branded preamps are from?

Oddly enough I bought the amp fully expecting I'd be returning it to the store within 30 days after I got the GAS out of my system, however after gigging with it last week I think it may be a keeper. Great clean channel, syrupy sweet and chimey at the same time and overdrive side to my ears has the clear open "bossy" Marshall sound I'm looking for. Reminds me a lot of the JTM/JCM600 series I've heard but hopefully without the design issues.

I think however the Marshall marketing dept missed the boat a bit with the naming though. Personally I think calling it something like JCM500 may have made it sound a little more acceptable and serious rather than MA which just seems to have a cheap ring to it right out of the box.
But for what my opinion is worth I think you did a stellar job on this one Steve. Now if we could only just rename it and add a dedicated solo boost knob I'd gladly pay double for one. :~)

[SteveD]

The MA uses Shuaguang preamp valves.

V1 = input buffer and first OD section
V2 = second OD section and tone stack
V3 = PI

[Nebulozny]

I have changed all preamp tubes to Tung-Sol, kinda liked them more than stock ones, also tried Electroharmonix in V1 position, wasn't impressed by difference, TungSol's were best tubes for my taste.
Clean channel is great indeed, but I really spend 90% of my playing time in the overdrive section.
MA is whole new concept from Marshall, and all it needs is some famous guy to play one show with the amp,and it will go up more, I see that people generally hate that ''Made in Vietnam'' label.

[Phano36]

I personnaly think that Electroharmonix sucks sorry if I offendent some peoples.
I use JJ.s Tesla in all my amps.
I made some shows using my MA but still it seems that it didn't brought the amp up lollll
I have one gig comming on April 26 maybe after that show the MA will be famous lollll.