My last 4X1 amp, back in the 80's, ran a pair in AB2. I used swamped grid
input with a toroid 4:1 step up from the T4XC to get the necessary grid
voltage. Screen and bias were all SS rectifiers but tube regulators.
With 5200V it put out some serious power. Since it was a build to order it
got only minimal air exposure here but the customer was happy. It is now at
its 3rd home.
Ive been wondering, besides the drive requirement, why swamped grid cant be
used in Class C? It would eliminate the neutralization requirement with some
tubes as well as the hassle of a bandswitching input.
Carl
KM1H
----- Original Message -----
From: "rbethman" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Tuesday, December 04, 2007 1:19 PM
Subject: Re: [AMRadio] Building
Chuck,
No pictures as of yet. I've got a Harris 4KV power supply for plate
power.
I'm looking at developing bias supply(s) for the 4-1000a, and driving it
OTHER than GG.
I figure I can get a better rig by doing so.
Bob - N0DGN
[EMAIL PROTECTED] wrote:
Say Bob............
Got any pictures of that 4-1000A lashup?
I've been collecting parts for a 4-400 amp and hope to start on it in
January when the temps get a bit cooler in the shop.
Have a DX-60/HG-10 just waiting to drive something.
73
W4MIL
Chuck
Palm Coast, FL
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