[Amps] parasitic suppressor voodoo

[DAVE WHITE]

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 at gmail.com> wrote:

From: Rob Atkinson <ranchorobbo at gmail.com>
Subject: Re: [Amps] parasitic suppressor voodoo
To: amps at 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
_______________________________________________
Amps mailing list
Amps at contesting.com
http://lists.contesting.com/mailman/listinfo/amps