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December 4th 03, 11:51 AM
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Alun wrote:
(N2EY) wrote in : In article , Mike Coslo writes: On top of all this was the development of grounded-grid zero bias "Class B" (actually, Class AB2) linear amplifiers for amateur SSB use in the 1950s and '60s. Most designs required "50 to 100 watts" of drive power - perfect match for the usual 100W rig. A quad of 811As, pair of 572Bs, a single or pair of 3-400Zs or 3-500Zs, or a single 3-1000Z were (and still are) common designs. Now ee have ceramic-metal indirectly heated tubes like the 3CX800A7 which require less drive, but the old habits die hard... You might be right about needing a 100W rig to drive most linears, but not about the 6146s. A pair of 6146 tubes will deliver 280W upto 30 MHz and half that upto 60MHz acoording to the spec. You're mistaken, Alun. A single 6146B is rated at 61 watts output in AB1. So a pair would be at the 120w level. The old Yaesu FTDX-560 was rated at 280W out with a pair off 6146s (560W input power, hence the model number). You're half right. The FT-DX560 was rated at 560w PEP input power but it used television sweep tubes. Dave K8MN |
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