There are still many 'older generation' transceivers in use, such as the once very popular FT-101 series, that rely on sweep-tube (TV line-output valve) poweramplifiers. Several items in TV (eg August 1999) have indicated howsome of these now rare (and hence expensive) valve-types can be replaced by still-available RF power valves such as the 6146B. Bill Tipton, K5JRI, in the 'Hints & Kinks' column of QST, September2000, pp68-69) provides useful additional information on this topics.
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