Same thing happened to me Bill. Only the filament wire going to the choke
was about 18 gauge wire. This caused about a 1.5 VAC drop from the filament
xformer to the choke for the 3-400Z's. I was only able to get about 600
watts out when I was supposed to get 1KW. I replaced the wire with 14 gauge
and there is now a full gallon going out to the antenna.
73,
Mike(y)
W3SLK
----- Original Message -----
From: William Fuqua <Wlfuqu00@pop.uky.edu>
To: Colin Lamb ; <k7fm@teleport.com>; <amps@contesting.com>
Sent: Monday, March 06, 2000 4:31 PM
Subject: Re: [AMPS] 6 volts on a 3-500Z filament
>
> I got a single 3-400Z homebrew amp that someone had given up on.
> I connected it to my power supply and fired it up. At first I thought the
> tube that came with it was bad but I then checked the filament voltage.
> It was almost 4 volts. The guy used a 5 volt transformer but did not
> allow for the drop in the filament choke.and wiring. I simply added
> a 24 volt boost transformer in the primary and that brought it right
> to about 5 volts at the socket. I can now switch out the
> boost transformer to extend the life of the tube when in standby.
> I imagine the builder must have been frustrated not being able to
> figure out why he could not get much output.
>
> 73
> Bill wa4lav
>
>
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>
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