I would look at Sunn schematics and add on/of cold clipper with a CF stack, but that is just me. May want to check the node feeding the PI and increase the voltage for more swing and I prefer in a guitar amp a 6SL7, but 6SN7 for Bass, Hifi and Sunn amps. This places the power section to take 6L6GC. If I were to make it into a geetar amp, I may change the L-C input which is most likely about 300 on the plates of the output tubes.Ĭhange it to Cap input and voltage will increase to to over 400, most likely around 440 with a GZ34 Rectifier. This one I believe has the 6sn7 PI driving 6L6Gb. Just as hammond or maybe more, the amps are reaally nice. Wonderful organs, but other items as well. Jimbob, Whirllitzer made a lot of things.