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

To: <amps@contesting.com>
Subject: [AMPS] Blown TL922A... What to do?
From: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK)
Date: Tue, 5 Sep 2000 22:08:45 +0100
measures wrote:
>
>>I had also noted the  grid current pinned the meter, 
>
>?  This is a fairly reliable indication of a parasitic oscillation c. 
>120MHz.  D-14 prevents destruction of the meter movement during the surge 
>in grid current during the intermittent parasitic.  
>
That is no proof of a parasitic. The grid current meter is in the return
path from chassis to B-minus, so a DC arc from B+ to chassis will pin
that meter with no RF involvement whatsoever. 

73 from Ian G3SEK          Editor, 'The VHF/UHF DX Book'
                          'In Practice' columnist for RadCom (RSGB)
                           http://www.ifwtech.com/g3sek

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