[Drake] Re: TR-3 Relay same as TR-4C? [Was: Need Relay for T4X-C]

[Paul Blumhardt]

Thanks all!

As several of you suggested, I ordered the relay below from Mouser - which
is great because they are local to me!

John Kriner indicates that he's never added any resistance in series with
the 2.5k ohm coil in his repairs. I may add a 10k resistor in series anyway
just to try to maintain some semblance of impedance on the plate of the
6EV7.

This is typical of my luck, could it be the tube???? Never!

Thanks again

VY 73
Paul


> -----Original Message-----
> From: drake-bounces at mailman.qth.net
> [mailto:drake-bounces at mailman.qth.net]On Behalf Of doc
> Sent: Friday, July 29, 2005 10:05 PM
> To: drakelist at www.zerobeat.net
> Cc: Drake at mailman.qth.net
> Subject: [Drake] Re: TR-3 Relay same as TR-4C? [Was: Need Relay for
> T4X-C]
>
>
> Is this the same relay used in the TR-3, please?
>
> Thanks!  doc
>
> Garey Barrell wrote:
> > Paul -
> >
> > The "correct" replacement relay is the P&B (Tyco) R10-E1-Y4-V2.5k, same
> > relay used in the TR-4C, which IS available from Mouser.  You need to
> > add a 1.5k 1/2W resistor in series with the coil, otherwise a drop-in
> > replacement.
> > The 15k ohm coil relays were failure prone, primarily because of the
> > very fine wire needed.  The bobbin would swell,  especially in humid
> > conditions, stressing and breaking the wire.  This is why T-4XC's that
> > have been stored in the garage for a while often have a bad relay!  The
> > 2.5k ohm coil of course uses considerably larger wire.
> > 73, Garey - K4OAH
> > Atlanta
>
> --
> Thanks! & 73, doc kd4e
>
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