> What is the point of having 24VDC from T2?
The bias supply is *negative* DC ... where do you expect to get it
other than a separate low voltage supply?
This bias supply is hardly complicated ... it is a scaled copy of the
circuit used in many other much bigger amplifiers/transmitters.
73,
... Joe, W4TV
On 5/4/2014 9:49 PM, Paul Decker wrote:
FYI, if it helps any, this goes to a 3cx800A7 amplifier of some sort.
----- Original Message -----
From: Paul Decker
To: amps@contesting.com
Sent: Mon, 05 May 2014 01:18:47 -0000 (UTC)
Subject: complicated Bias circuit
Hi builders.
Hopefully you all can view this schematic.
I'm trying to understand what T2 and associated circuitry do. D17 and D18 seem like a simple bias
circuit as SW3 selects between "class C" and "class AB1" It seems opening R20
puts tube in standby (RX).
What is the point of having 24VDC from T2? Is it to have a smaller wattage D17
and D18?
https://scontent-a.xx.fbcdn.net/hphotos-frc1/t1.0-9/10289874_10202768703951918_1823401065078063020_n.jpg
Thanks in advance,
Paul
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