Your choice? Plexi vs Bassman

nick · 2011-04-13T18:23:27+00:00

'68 Marshall JMP SuperPA, 100w '69 Bassman, 50w Which would you choose? ? My personal Pros/Cons Bassman: Pros: 1.) Head is small enough to cart to gigs 2.) Definately loud enough with 50w 3.) Gets very dirty with my Les Paul! 4.) AB169 circuit which is apparently the BF Cons: 1.) Not much clean headroom (with my Les Paul) 2.) Head wants a 4ohm cab, I have 2x16ohm Greenbacks Marshall: Pros: 1.) Takes pedals insanely well ??? 2.) Plenty clean headroom, only breaks up at plenty something on the dial 3.) Dont be fooled by the PA part, done some reading and apart from the extra 4 inputs, its a Plexi, some suggest removing those inputs 4.) Switchable 4,6,16 ohm output Cons: 1.) Its huge.. and weighs a ton 2.) Slight buzz which could be an old valve or dodgey cap

FenderBender

nick wrote According to the amp schematic, one tube should be as 12at7

That would be the phase inverter, closest to the power tubes. The 12AX7 in that position is the reason you had so little headroom. I'm stoked you found the problem!

FenderBender

Just for reference:

ECC81/12AT7 - gain approx 60
ECC82/12AU7 - gain approx 17
ECC83/12AX7 - gain approx 100

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