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1. [Amps] Longetivity of 4CX250B (score: 219): Author: sm0aom at telia.com (Karl-Arne Markström); Date: Mon Jun 23 08:18:47 2003; Most interesting information. Having managed Telefunken 20 kW HF transmitters at work using parallel 4CX250B's as drivers, the average filament hours we got usually were around 2 years (16000 h) befo; /archives//html/Amps/2003-06/msg00182.html (10,373 bytes)
2. [Amps] longevity of oxide cathode tube (score: 219): Author: sm0aom at telia.com (Karl-Arne Markström); Date: Wed Jun 25 09:25:17 2003; Interesting, this description fits in on the 4CX350AC, which is marketed by Svetlana and others as a lower temperature cathode and consequently longer life version of the 4CX350A. I have encountered; /archives//html/Amps/2003-06/msg00211.html (12,368 bytes)
3. [Amps] longevity of oxide cathode tube (score: 219): Author: sm0aom at telia.com (Karl-Arne Markström); Date: Thu Jun 26 08:14:17 2003; If I remember correctly, this was the normal procedure for some cavity magnetrons, as soon as RF pulses were detected at the output a relay turned off the filament current. If I remember correctly, t; /archives//html/Amps/2003-06/msg00215.html (9,386 bytes)
4. [Amps] Believe it or not... re: REPEATER RANGE CALCULATOR (score: 219): Author: sm0aom at telia.com (Karl-Arne Markström); Date: Fri Mar 7 01:14:44 2003; Hi all, If you haven't seen an analog computer before, now you have... First time, however, that I have seen one packaged in a VTVM case. Usually analog computers were big racks of operational amplif; /archives//html/Amps/2003-03/msg00286.html (8,757 bytes)

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