So, Modulus 5e3 - fully rewired with cloth cable using the shortest runs I could. Lowered the bias resistor on v1 to heat up the preamp and lose a bit of headroom and completed the Paul C Pi mod A - it absolutely sings and I could not be happier.
my 5e5a (Fender 5e5a 57 Custom shop) has the same preamp mod, but also has the local feedback loop removed, switchable global negative feedback and the paul C mod - totally sings and drives super hard, yet with great clarity.
next thing I am gonna try is removing the choke in the 5e5. It measures at about 100ohm, but as an inductance device I guess that changes depending on the current/voltage pull and it probably removes some hum due to the same dynamic. The 5e5 layout (not 5e5a) as a none choke amp suggests a 2k5 resistor in place of the choke - but any recommendations/ideas here. I am experimenting a bit to see how it sounds - my ultimate amp would be a vintage 5e5, if one comes up in the Uk…!
i am also looking at the Marsh Amps 5e5 kit as an option, so, if anyone has built this please do let me know.
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