Garey,
The relay came in from Mouser and I made the mod today. (The bad one was the
Varley) The T4XC is working fine. Thank you for the assistance.
Rick
W0RT
----- Original Message -----
From: "Garey Barrell" <k4...@mindspring.com>
To: "drakelist" <Drakelist@zerobeat.net>
Sent: Sunday, July 17, 2011 12:43 PM
Subject: Re: [Drakelist] T4XC
If it's the Varley, you need a P&B (Tyco) R10-E1-Y4-V2.5k, available from
Mouser and Digi-Key.
You'll need to add a 1.5k 1W resistor in series with the coil, otherwise a
drop-in replacement. Look at the socket for V10, the 6FQ7 (or 6EV7).
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 for a 15k ohm coil. 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.
If it's not the relay, then you'll have to look at the 6EV7 and relay coil
wiring. Not much else involved, the 6EV7 is 'hard switched' in TUNE, so
the VOX isn't involved.
73, Garey - K4OAH
Glen Allen, VA
Drake 2-B, 2-C/2-NT, 4-A, 4-B, C-Line
and TR-4/C Service Supplement CDs
<www.k4oah.com>
Richard Tucker wrote:
Garey,
No problem. I have been halfheartedly following that TR4C thing and
understand.
No relay click and no idle current. Must be the relay. I'll check it
out. I did pull and reseat all tubes . I also switched out V1 and 10 in
the VOX circuit. Still nada.
73 to all and thanks.
Rick
W0RT
----- Original Message ----- From: "Garey Barrell" <k4...@mindspring.com>
To: "Richard Tucker" <ri...@wavewls.com>
Cc: <drakelist@zerobeat.net>
Sent: Sunday, July 17, 2011 9:33 AM
Subject: Re: [Drakelist] T4XC
Richard -
I'm sorry. Didn't mean to 'attack' like that. This TR-4C that we've
been working on for about 500 messages has about gotten on my last
nerve! :-) I just KNOW it's going to be something silly that I missed
487 messages back.
Even after all that yesterday, I still didn't remember until last night,
"Do you hear the relay click?" when you switch to tune. And "Do you see
IDLE current?"
If it still has one of those "Varley" British made relays, most likely
an open relay coil, probably made by Lucas! :-)
73, Garey - K4OAH
Glen Allen, VA
Drake 2-B, 2-C/2-NT, 4-A, 4-B, C-Line
and TR-4/C Service Supplement CDs
<www.k4oah.com>
Richard Tucker wrote:
Sorry Garey. I guess I assumed that it would be asssumed by those on
the list that the PS was plugged in and the T4XC was switched on.
PS plugged in
Mode switch to SSB
All knobs set up for 40cw
It turns on with a "thunk"
AC4 has recent Heathkit shop kit installed and worked when last used.
All tubes light up
transcieve switch works as it should including switching of dial
lights.
All pilot lights are lit up
no meter movement
will not spot
will not key on cw.
It does not do anything in any switch position except turn on
I checked and rechecked all cables and hookup detail. Checked for bad
connections with RCA plugs.
I am familiar with using the Drake R4 line from many years of use but a
little brain dead from setting in 100 deg wx watching grandsons
baseball games.
Tommorrow AM I will take it out of the case and double check that all
tubes are light and unplug and plug athem. I will deoxit the mode
switch. Thank you.
Rick
W0RT
----- Original Message ----- From: "Garey Barrell"
<k4...@mindspring.com>
To: "Richard Tucker" <ri...@wavewls.com>
Cc: <drakelist@zerobeat.net>
Sent: Saturday, July 16, 2011 9:01 PM
Subject: Re: [Drakelist] T4XC
Rick -
Ya gotta give us more than that!!
Is the power supply connected?
Is it plugged in?
Is it turned on?
Do you hear it 'thunk' when you turn it on?
Do the tubes and pilot lamps light up?
Are ALL the tubes lit?
Does the meter move?
Does it do 'anything' in any switch position?
73, Garey - K4OAH
Glen Allen, VA
Drake 2-B, 2-C/2-NT, 4-A, 4-B, C-Line
and TR-4/C Service Supplement CDs
<www.k4oah.com>
Richard Tucker wrote:
T4XC was working fine and sat for a while (6mo) Hooked up with R4C .
Switched to tune. Nothing. It would not go into tune. Any
thoughts of what I should check first? I rocked the switches and
double checked the cables, etc.
Thanks
Rick
W0RT
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