In the 1960s Henry & others marketed amps for other than amateur use. They were called ' export models'. For military, government civilian & other uses. Most would easily reach amateur limits for domestic use. The 'export models' usually had a heavier plate transformer. Some times a larger cooling chimney. The same amperage but 500v or more higher out. Using the same amp but with the export model xfmr could result in 500 or a 1000 more watts output.A friend was stationed on Deigo Garcia in the Indian Ocean. The ham shack ran such an export model amp. They used it for hamming & MARS work. He said if he LIGHTLY drove this amp it put out 3KW. Another friend bought a used amp with the 'export model' label. He had to really drive it lightly. He set the HyGain balun on his TH6 on fire! Supposed to be a 5 KW balun. The bigger Alpha had 3 holes cut in the chassis. USA ones were sold with 2 tubes but I've heard guys say they were running a full 3 holer. You fill in the blan k. These companies need to sell to other markets besides amateur radio to stay in business.Henry amps used to be used in hospitals for Diathermy. k9il ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net
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