The QRPLabs 10W linear amps and the 50W non linear amps seem to have very similar output circuitry. I am awaiting delivery of my QMX+ but I also have had for a long time one of the 10W linear amps (bought in anticipation of the QSX) that I want to use. My question is¡if I removed the BS170 drivers in the 10W linear amp and added a smallish input matching attenuator would the gain be sufficiently reduced so it could be driven linearly from say a 1-2W drive from the QMX? I am really only interested in the SSB output at the higher frequencies i.e 10m and 6m and beyond, as I noticed reports of quite low powers reported generally from the QMX+ at these frequencies.
I was proposing feeding the output of the 10W amp back through the QMX+ LPFs as the old LPF modules were rated at 10W so I don¡¯t see why the QMX+ should not handle the same. I was even considering changing the IRF PA devices for the higher frequency version used in the 5W amp (did this and got it working on 70MHz fine).
wadderya think?
73 Ken G4apb?
