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[Amps] Amplifier oscillating - any ideas?

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Subject: [Amps] Amplifier oscillating - any ideas?
From: "Sean Williams" <m1ecy@m1ecy.me.uk>
Date: Fri, 19 Aug 2005 14:42:43 +0100
List-post: <mailto:amps@contesting.com>
Hi All,

Having just got to testing my pair of Gi7bs on 144 MHz, I notice it oscillates 
quite happily at 478Megs.....

The amp is built to YU1AW easy build design, with one slight modification - I 
am using a 100pf doorknob as the HT decoupling cap.

Swinging any of the controls has no effect over frequency or power of the 
oscillation.

I have relocated the anode RFC so it has shorter leads, the grids are well 
grounded with brass collets that cover 99% of the grid connection and are well 
bolted to the aluminium chassis.

Any suggestions would be well recieved!

73 De Sean M1ECY
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