The most obvious things to check would be the TX/RX relay contacts welded
in RX or a blown RF coupling cap at the filaments.
Since you have idle current the DC path is OK.
Carl
KM1H
----- Original Message -----
From: <TNeill1648@aol.com>
To: <amps@contesting.com>
Sent: Sunday, June 24, 2007 11:20 AM
Subject: [Amps] Kenwood TL-922A Amp
>I am having a problem with my TL-922A and would appreciate any suggestions
>on
> what the problem may be before I open it up and look around.
>
> We recently had a major thunder storm that generated significant
> lightning.
> I thought I had unplugged and disconnected all cables but had over looked
> the
> 922A.
>
> When AC is applied to the amp it comes on and appears to be functioning
> normally. HV is in the normal range. There is no smell generally
> associated with
> a burned component. Everything appears normal.
>
> When the amp is keyed, the change over relay operates normally and the
> idle
> current on the final tubes is OK.
>
> Once drive is applied, nothing happens. There is no grid or plate current
> indication of drive being applied.
>
> It seems as though there is an open circuit in the input section.
>
> Does the 922A have any type of protection circuit for the input? Perhaps
> a
> diode protection circuit? I have had this amp 20 years and this is the
> only
> problem I have ever had.
>
> Thanks.
>
> Tom K4XG
>
>
>
> ************************************** See what's free at
> http://www.aol.com.
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