I had lightning here a few yrs ago...Not a direct hit,but close...The relay
contacts welded together in my amp.Symptoms:The amp would key up and show
zsac but drive was sent directly to the antenna and not to the tube
cathode....Check transfer rlys...Good place to start...Jim..
----- Original Message -----
From: "jeremy-ca" <km1h@jeremy.mv.com>
To: <TNeill1648@aol.com>; <amps@contesting.com>
Sent: Sunday, June 24, 2007 9:36 AM
Subject: Re: [Amps] Kenwood TL-922A Amp
> 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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> >
>
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