----- Original Message -----
From: <gdaught6@stanford.edu>
To: <amps@contesting.com>
Sent: Wednesday, November 27, 2013 11:53 AM
Subject: Re: [Amps] Chinese FU-724F
Hsu wrote...
I found a Chinese cheap triode for industry, filamnet 6V/50A;
Pamax=2.5kW; Grid diss=150W;Umax=6kV;
u=70, you know most industrial triodes are low/ meidum u tubes, but
this one is high u tube.
As it is idustial tube , so the price is cheap.Any suggestion?does
it fit hamradio well?
Look at the mu (amplification factor) for the 3-500Z, or the 8877, for
example: 160
and 200. With a mu of 70, it will take considerably more drive power than
what is
usual for amateur service.
73,
George T Daughters, K6GT
CU in the California QSO Party (CQP)
October 4-5, 2014
No argument there but many rigs have excess power to burn and many others
use an IPA to drive a YC-156 and other tubes with handles anyway. That is
what the ALS-600, SB-1000, AL-80 family, etc are used for.
Also several of the old glass tetrodes popularly used in GG wind up with an
effective mu not much above the FU-724F, especially when run at a voltage
well below their maximum. Think 4-1000A or a 4-400 used in a SB-220.
Carl
KM1H
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