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Any hi-gain module would work for this mod and even like as "top boost" and "JTM"

for hi-gain modules from only new tubes (not NOS): 1. Ei (Yugoslavia) this is replica of telefunken tubes 2. Mesa Russian-1 (Russia) 3. Tung-Sol (Russia) 4. Electro-harmonix (Russia) 5. Shuguang (China) 6. JJ (Slovakia) but this range variable from module to module

KH-1=Blackface 100% !!!!!!! :(

This is last upd schematics This is not 100% pure "Krank" shematics, because randall's first tube stage of preamp on the chasis location are not contain krank's parts values. First stage is common for the all modules at the same time I did formulated this shematics by myself from the original...

I will modifed the "UltraLead" module into "Krank Krankenstein". Modded module has more sharpnes of rythm sound than original Krank because was used 2.2 nf capacitor instead of 22nf. This is schematics of complete mod: P.S. SALVATION MODS it's super sound and appearance!

And one more modification of XTC module. It called "XTC MOD" :D I was replaced electrolytic cap from 22uf to polyester 2.2uf, and I was placed switch "structure" with replace cathode resistor from 2.5k to 2 x 4.7k like this was in original preamp.