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Title: Could anyone please ID this RCA 400W RF amp? Post by: Opcom on January 14, 2026, 02:54:22 AM This is maybe a senior moment, as it's been sitting on a shelf for several years, apparently put aside and then forgotten then buried as more urgent work had to get done. AMfone - Dedicated to Amplitude Modulation on the Amateur Radio Bands
I bought it off ebay and IIRC the seller said its frequwncy range was 54-88MHz. It says "class AB" on the two amplifier boards. I was able to look up "Band I" to find that it is indeed 54-88MHz in the USA (47-68MHz in the EU). Unfortunately, searching hasn't turned up these old part numbers or documents. I don't know what model of transmitter it's from. The RCA name plate says: 400 WATT AMPLIFIER BAND I MI-563161-1 SERIAL 2386110 CAMDEN, N.J. Some data on the two main amp boards are: 69893 CODE CC CLASS AB 3477904-2B L/P 3729671 MI-563181-1 So basically there's an input splitter made of PCB material, the pair of push pull amps, and a combiner made pf PC board as well. Additionally, a control board and multimeter & switch are at the front. A large power socket, and a row of large pins that apparently take the bias. ground, and other voltages that are needed. There's a huge heat sink on the underside. Transistors: four 372901-2, and two 3729474-4. Does anyone know if this might work on 6 meters (even at reduced power), and the correct voltages for it, or has the manual for it, so at least I could test it without frying it? Thanks in advance, Patrick |