[Drake] T4XB T/R Relay hangs

Sun, 21 Dec 2003 21:21:49 -0600

Coil is not grounded, thanks.

-Pete

-----Original Message-----
From: "David Harmon" <[email protected]>
To: "'Peter Veach'" <[email protected]>, <[email protected]>
Date: Sun, 21 Dec 2003 19:09:10 -0800
Subject: RE: [Drake] T4XB T/R Relay hangs

> Before you do that, try adding a piece of scotch tape under the relay
> armature to add a little residual gap between the armature and the
> core.
> You can add several pieces to see if that will help any.
> However, after looking at the schematic, I'll bet that the relay coil
> has shorted to ground....not enough to operate the relay without help
> from the tube, but enough ground to keep it operated after the tube
> stops conducting. The relay has 250vdc on it all the time. If you
> remove
> the tube and the relay does not release.............that's it...the
> coil
> has gone to ground.
> 
> 
> Regards
> 
> Dave Harmon
> NSRCA 586
> [email protected]
> Torrance, Ca.
> 
> -----Original Message-----
> From: [email protected]
> [mailto:[email protected]]
> On Behalf Of Peter Veach
> Sent: Sunday, December 21, 2003 6:39 PM
> To: [email protected]
> Subject: Re: [Drake] T4XB T/R Relay hangs
> 
> Ok, I tried the reversing the wires trick and it had no effect on the
> problem. I have a photocopy of the manual, but the only schematic 
> included is for the power supply. The 6EV7 tests good on my sencore 
> tester, but I will order a new one anyway. I have not used this rig
> for 
> a while, but this was starting to cause problems the last time I used
> it. It seemed like the last time it did this, after a while the
> problem 
> went away, so maybe the tube. Kinda weird though. Unless the relay is
> bad and that thing does not look like fun to replace. 
> 
> thanks
> 
> -Pete
> 
> 
> -----Original Message-----
> From: "Al Parker" <[email protected]>
> To: "Peter Veach" <[email protected]>, <[email protected]>
> Date: Sun, 21 Dec 2003 18:58:43 -0500
> Subject: Re: [Drake] T4XB T/R Relay hangs
> 
> > Hi Pete,
> >     Could be the 6EV7, could be it's cathode bias resistor.  Could
> be
> > if
> > you adj the bias slightly you'll fix it, or the anti-vox pot.  The
> > esteemed Barry Ornitz has suggested that swapping wires to the
> relay
> > will
> > counteract the residual magnetizm that may have developed.
> >     You oughta have a schematic/manual.  The ones on BAMA, or 'most
> > anywhere else on-line, are poor resolution, the originals skems
> > weren't
> > very good to start with.  Let me know if you can't get a decent
> one,
> > I'll
> > send you a good scan.
> 
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