On a 2 times 4-1000A amp (5.5kv, grounded grid, cathode driven) I used two
separate parasitic suppressors, each with 3 paralleled 50 ohm carbon resistors
inside a 15mm diamater two-turn coil of 2mm copper wire over about 10mm
length. The amp has worked flawlessly (80 thru 10m) for many years.
If yours is a low band amp, you could probably make REALLY certain by
increasing the number of turns on the coil. Initially with four turns the
resistors smoked a little on 10m. I guessed "too much L". There was no
science to building these suppressors - it was a case of looking at the W6SAI
"Radio Handbook" and seeing if it worked. Voodoo? Maybe.
I didn't try the amp without parasitic chokes but it seemed to work and "if it
ain't broke, don't fix it"....
Hope this helps
Dave G0OIL
--- On Thu, 15/7/10, Rob Atkinson <ranchorobbo@gmail.com> wrote:
From: Rob Atkinson <ranchorobbo@gmail.com>
Subject: Re: [Amps] parasitic suppressor voodoo
To: amps@contesting.com
Date: Thursday, 15 July, 2010, 18:40
I would love to know what if any p.s. is needed on a pair 4-1000A at
4.5 KV triode connected cathode driven for 160, 75 and 40 m.
rob
K5UJ
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