HF Amplifier Rogue's Gallery
Weather is too nice (but hot, humid, and buggy) to justify a lot of inside time for electronics. Thought I post a gallery of recent HF (broadband) amps. No tube amps, here. Left to right: 2-stage 2N5109/RD15HVF1 - 6W out for 1mW in; push-pull RD15HVF1's - 16W out (KK4DAS's design); push-pull RD30HVF1's - 35W out; push-pull RD70HVF1's - 85 to 100W out; single-ended MRF101 (WA2EUJ design) - >100W output with 50 volt supply. (All the other amps are designed for 12 - 14 volt supply.) I tend to use the HVF devices, even at HF, for higher gain. No power oscillators, yet! I plan to evaluate/optimize IMD behavior for each of these (probably during the winter). One of them will get packaged with a switchable LPF for day-to-day use. Haven't delved into any => VHF amps, recently. I have a selection of these left over from the past, ranging from 25W to 1000W out. Don't need to build any more. ...