Don -
Depending upon the serial number of your T-4XC, you may need to add a
resistor.
The "correct" replacement relay is the P&B (Tyco) R10-E1-Y4-V2.5k, same
relay
used in the "late" T-4XC and TR-4C, which IS available from Mouser and
Digikey
among others. Currently about $18.
If your old relay is a Varley with a 15k coil, you need to look at the
socket for V10, the
6FQ7 (or 6EV7). If there is a 1.5k, 1W resistor connected between Pin 6
and Pin 9,
just plug in the new relay. If there is NO resistor, remove the wire
connected to Pin 6
and move it to Pin 9, add a 1.5k, 1W resistor between Pin 6 and Pin 9,
and plug in
the new relay.
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
Glen Allen, VA
Drake 2-B, 4-B, C-Line& TR-4/C Service Supplement CDs
<www.k4oah.com>
Don Jones wrote:
Hi,
Looks like I have a flakey T/R relay in my T4XC. I am looking for a
source for a replacement part.
73, Don KO7i
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