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  1. CCC GGG

    Palomar TX-5300 using four MRF421's

    I picked up a TX-5300 on EBay for $81 and just for grins put in a set of four MRF421 transistors. Had to bring the bias down to about 0.4 Volts to keep the thermal runaway in check. Also added 150 ohms in series with 0.1 uFd between each collector and base to help stabilize it. I'm mainly...
  2. CCC GGG

    HW-8 on steroids

    I picked up a clean HW-8 a while back and finally did a mod I've wanted to try for a while. I designed a super simple amp using a single MRF-454. It uses a 9:1 broadband balun on the input and output in order to sort of match the 'few ohms, mostly resistive' input and output impedance of the...
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