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[AMPS] Blown TL922A... What to do?

To: <amps@contesting.com>
Subject: [AMPS] Blown TL922A... What to do?
From: W8JI@contesting.com (Tom Rauch)
Date: Sun, 10 Sep 2000 20:17:22 -0400
Subject:                RE: [AMPS] Blown TL922A... What to do?
Date sent:              Sun, 10 Sep 2000 13:00:01 -0700
From:                   measures <2@vc.net>
To:                     "AMPS" <amps@contesting.com>

> Using such software, it was determined that the 8877 is likely to be able
> to oscillate above 100MHz.  In my opinion, corrective measures are
> indicated. 

The self-neutralizing frequency of an 8877 with properly grounded 
grid is several hundred MHz. I suppose the tube might be "likely" to 
oscillate up there  if conditions are right.

 > The intermittent nature of VHF parasites makes this difficult at best. 

What makes a parasitic "intermittent"? The stage either has 
enough regenerative feedback, or it does not. All you have to do is 
duplicate the feedback conditions, and you will have a repeatable 
oscillation.
 

73, Tom W8JI
w8ji@contesting.com

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