¿ªÔÆÌåÓýGrids don¡¯t have enough thermal mass for protection like a plate has.? Exceeding peak values are enough to blow out a grid. ? Many moons ago, I had a Henry 3-KA it had a pair of Eimac 3-500Zs had sheet metal plates and ~ 3500 Volts on the plates.? It was a beast.? It was a mess when I bought it.? I had to rebuilt the plate circuit wiring and replace the noisy plate circuit fan.? I replaced the fan with a more powerful Dayton squirrel cage blower. This was in the days when the US FCC power limits were 2K peak output.? The FCC intended that 2K peak to be for SSB. ?But the rule was written 2KW peak.? 2KW peak for SSB is also 2 KW peak for CW. ?At that power level the plates were a nice dull red¡ªjust like the spec sheets says.? And a Bird Wattmeter indicated 2 KW output¡ªprobably exceeded the 500 Watt per tube dissipation but the greater air volume helped mitigate that some.? Worked out well for a bunch of CQ World-Wide Contests. ? 73, Dave, w6de ? From: [email protected]
<[email protected]> On Behalf Of Kim Elmore via groups.io
Sent: 17 April, 2025 19:33 To: [email protected] Subject: Re: [ham-amplifiers] SB-1000 ? I can¡¯t help but chime in: RMS is the only value that makes sense. Outlet voltage in your house is 120 V RMS. There¡¯s no such thing as ¡°RMS power¡±; peak power come from peak RMS values.? ? Kim N5OP ? ? "People that make music together cannot be enemies, at least as long as the music lasts."?-- Paul Hindemith
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