Go to Rich Measures site and read up on parasitic suppressors. Pay close
attention to what he writes and follow his suggestions.
Link is http://www.somis.org/
73
Bob, K4TAX
----- Original Message -----
From: "jerome schatten" <romers@shaw.ca>
To: <tentec@contesting.com>
Sent: Thursday, April 03, 2008 5:28 PM
Subject: [TenTec] another amp question
> Learned gentlemen...
>
> Excuse me if this is somewhat off-topic, but I've been following the
> 811 amp discussion with much interest and have a related question:
>
> I'm currently doing some work my pair of 813's and was thinking about
> the 'parasitic' problem as discussed on this list.
>
> My fear is not blowing the tubes or the band switch, but rather in
> blowing the front end of a modern transceiver driving it. The
> configuration is a pair of 813's truly running zero bias GG (grids all
> tied together and connected directly to ground ~ 50 ma. idle current
> at 2200v). No band switch (rotary inductor pi-network). Manual
> switching tx/rx avoids hot switching. Input to the amp is grounded in
> Rx. Works 80 thru 20 only.
>
> Should I be worried about the parasitic problem taking out what's
> driving it? If so, how to prevent (minimize) that? In the 40 years
> I've been running this beast (still the same set of tubes) I've driven
> it with everything from a Viking Ranger, to a Jupiter and never had so
> much as burp. But one never knows.
>
> Getting nervous in Vancouver,
> va7vv
> --
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