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[uzerman]

To build your 50W combo amp around the LP-PRE, you'll need several components: a DPDT footswitch and high-quality FETs (like 2N5457 or J201) for channel switching and input buffering, preamp tubes (12AX7 or equivalent), potentiometers, capacitors, and resistors for tone controls. For the PA-66 power amp, gather parts for individual bias points (trimpots, test points), a pentode/triode switch (high-voltage rated), components for body and presence controls, feedback loop and bias mode switches, and a power scaling kit (like London Power). You'll also need parts for the SV1 reverb and RBX modules, and switching options for the BFX loop, including a parallel/serial switch and in/out bypass. For footswitch control, get a custom three-button footswitch to manage channel switching, FX loop, and FET input, possibly using relays or a controller from companies like Voodoo Lab. Ensure Hoffman in NC makes your chassis with all necessary cutouts, and coordinate with your cabinet maker for compatibility with the ET-90 speaker. Don’t forget miscellaneous items like high-quality jacks, wiring, fuses, and test equipment (multimeter, soldering tools). Your experience with the Soma84 and D-PRE will serve you well—this build will be challenging but rewarding, bringing your dream amp to life!





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