Hsu, what g2 did you use? It seems as though the GU-81M consumes
a LOT of g2 current, too...
73 & HNY,
Steve K0XP
On 12/27/2023 11:54 AM, Hsu wrote:
It seems that the GU-81M is what you want. I just
built an amplifier using a pair of FU-81/FM-8 (GU-81M/GI-8) with
output power: 1.8-14MHz, 2900W, 21-28Mhz, 2500W.grid driven, if
you only want 1KW, you can use one GU-81M on grunded-grid with a
power gain of about The GU-81M has a large
output capacitance, the plate capacitor must be replaced with a
fixed capacitor and requires a roller inductor to tune, and at
21MHz and higher, the plate capacitor C1 is replaced by the
output capacitor, as the EX8A does.?The amplifier is very quiet
and requires little to no heating time, and the tubes are very
inexpensive
? ? ? ?Hsu
desmond auld GI0UTE <
desauld@...>
于2023年12月27日周三 16:32写道：
Peter,
You are of course correct. But due to the tappings I have
options to get the voltage to where I want. The rectifier and
the DC produced would be better if I settled on 3 phase, but I
prefer this to be a plan b at this stage.
Thanks des?
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