You should at least call Ric Schultz at EVS. I am pleased with the output board mod he did for me, and he has a range of options for solid state mods at reasonable prices. If you really want a tube output, then of course Modwright is the big option.
Keep in mind that the Modwright option utilizes a substantial external power supply that is great in terms of performance, but may be a problem in terms of space.
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