[Amps] Neutralizing push-pull amp

[Carl]

The easiest way to tune it is with a signal generator driving it at 30 MHz 
and a receiver or SA at the antenna connector. No voltages of course.
Move the rod closer or away with a non metallic object to determine if 
signal increases or decreases, trim or add length as needed. Absolute 
perfection not necessary but you want a good 25dB in/out isolation.

Carl
KM1H




----- Original Message ----- 
From: "B Osburn" <plantrunner5 at msn.com>
To: "Amps List" <amps at contesting.com>
Sent: Thursday, March 14, 2013 12:23 PM
Subject: [Amps] Neutralizing push-pull amp



Neutralizing push-pull amp
In pictures I see about a 2” long rod about 1” from the tube plate.   How do 
you tune it?  Keep making the rod longer/shorter?   How do you arrive at the 
initial location? This is for a pair of 4CX1500Bs: 2750V Plate, 225V 
Screen, -34V bias on the grid, Class AB1, 160M-20M.
Brad AB0YD
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