From: "David Austin" 
Subject: [drakelist] T4XC relay source?


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Hi everyone,

Trying to fix my T4XC last night, discovered that the problem is an open =
circuit solenoid on the plug-in relay (K1). The relay is a Varley VP4 =
CAB/120. Just wondered if anyone has needed to replace this before and =
if so where they might be obtained at reasonable price? I have searched =
the web to no avail (quite a few VP4, but not this specification). Have =
contacted manufacturers here in the UK (now owned by Clifford and Snell) =
who tell me that all relays are made to order in batches, so think their =
quote is going to be quite expensive. The closest I have found is a VP4 =
CAB/26 (26 volt solenoid as opposed to 120 volt), which will presumably =
not be suitable even with circuit mod?

Also, is there a liklehood that a fault in the vox control tube (6EV7) =
used to switch this relay could have caused the burnout, or is this very =
unlikely? Can plate resistance of a tube go low, causing excess current =
draw? Don't want to replace the relay only to blow it again!

David
G4GTP
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Hi everyone,
 
Trying to fix my T4XC last night, =
discovered that=20
the problem is an open circuit solenoid on the plug-in relay (K1). The =
relay is=20
a Varley VP4 CAB/120. Just wondered if anyone has needed to replace this =
before=20
and if so where they might be obtained at reasonable price? I have =
searched the=20
web to no avail (quite a few VP4, but not this specification). Have =
contacted=20
manufacturers here in the UK (now owned by Clifford and Snell) who tell =
me that=20
all relays are made to order in batches, so think their quote is going =
to be=20
quite expensive. The closest I have found is a VP4 CAB/26 (26 volt =
solenoid as=20
opposed to 120 volt), which will presumably not be suitable even with =
circuit=20
mod?
 
Also, is there a liklehood
that a fault =
in the vox=20
control tube (6EV7) used to switch this relay could have caused the =
burnout, or=20
is this very unlikely? Can plate resistance of a tube go low, causing =
excess=20
current draw? Don't want to replace the relay only to blow it=20
again!
 
David
G4GTP

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