If the heater isn't driven, the heater will sputter itself to the cathode
and eventually it will end up with a short between the heater and the
cathode. You need to put a filament choke in an amplifier using an 8877 and
NOT ground either side of the filament.
73, Jerry K0TV
----- Original Message -----
From: "R.Measures" <r@somis.org>
To: "AMPS" <amps@contesting.com>
Sent: Tuesday, March 01, 2005 11:48 AM
Subject: [Amps] AL-1500 Circuit Diagram
> In the AL-1500 diagram, the cathode is connected to one side of the
> heater, C7 couples RF from the tuned-input to the cathode ,and C8
> couples RF from the tuned-input to the other side of the heater. Can
> someone please explain why the heater is driven with RF?
>
> Richard L. Measures, AG6K, 805.386.3734. www.somis.org
>
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