[R-390] RE: RE: 390A relay problems

[Bob Young]

Yes, thanks Dave,

I'm used to big tube amps that draw a lot of plate current when standby is 
switched off or transmitters which do the same thing. I think mine may be 
doing it though because of the long gradual build up in voltage of the 
inrush limiter, it doesn't do it if plugged into the wall bypassing the 
limiter, or it could be a hint of a later problem?

Bob
KB1OKL




>From: "David Wise" <David_Wise at Phoenix.com>
>To: <r-390 at mailman.qth.net>
>Subject: RE: [R-390] RE: 390A relay problems
>Date: Tue, 2 Oct 2007 10:20:06 -0700
> > notice if I switch
> > >past standby and go right to AGC, it immediately pulls right in,
>
>This sentence indicates a misunderstanding on the part of
>the speaker.  The R-390A antenna relay grounds/disconnects
>the input when it's picked, and enables/connects the input
>when it's dropped.  In STANDBY and CAL, it's picked; in
>AGC and MGC it's dropped.  The "pulls right in" is actually
>the half-picked relay dropping, not a successful pick.
>Those old rectifiers always go bad; put it out to pasture
>and install a silicon bridge.
>
>Dave Wise
>