[ARC5] R-27/ARC-5 Hookup Question

[Bill Cromwell]

On 07/19/2013 08:30 PM, D C _Mac_ Macdonald wrote:
> Hi, Robert and ARC-5ers.
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> Can you actually feed the HV, gnd, and filament supply in through that back connector?
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> I'm thinking of building up multiple power supplies and matching sets of remote controls on a chassis to run several receivers.
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> I recently purchased four 12.6 VAC @ 3 A transformers and already have four transformers with 115/230 V primary and 120 V C.T @ .5 A secondary.
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> I figure I can apply ~120 VAC to the seondary and full-wave rectify the 115/230 V primaries to run ARC-5 receivers.  Should be able to get an easy 50 Watts out.
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> Basically, my idea is to build a box that will power and control up to four ARA/274-N/ARC-5 receivers.
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> Since some of my "Command" receivers have already been hacked on the rear connector, I can build cables to run them from the "magic" box as well.
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> I haven't been able to find any receiver racks or I would use some of those instead.
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> * * * * * * * * * * *
> * 73 - Mac, K2GKK/5 *
> * (Since 30 Nov 53) *
> * k2gkk at hotmail.com *
> * Oklahoma City, OK *
> * USAF & FAA (Ret.) *
> * * * * * * * * * * *
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Hi Mac,

I don't have of the command transmitters. I have not used the rear 
connector on my receivers. I have been into the wiring during recapping 
and I have been looking closely at the schematics. You should be able to 
run the radios through that rear connector. That is what I intend to do 
with mine. I will turn them from one power supply/controller that will 
switch the voltages like a 'bandswitch'. Since my radios all already 
have the usual sensitivity/BFO/audio junk hanging on the front I need 
only supply the heater and plate supplies through the back along with my 
proposed "muting" line. You won't need to supply the screens through 
there as the plate supply pin is common with the dynamotor plate supply 
pin on the back porch. The screens will be supplied the normal way. The 
dynamotor pins on the back porch will need to be covered with an 
insulating material.

I don't have any of the racks or trays or anything else with my 
receivers but I note that the rear socket has all female contacts. If 
you wire up a cable from your power supply to plug in there you could 
possibly have exposed, live pins when the cable is unplugged. I intend 
instead to use an idea I saw somewhere (maybe here) and run wires 
through those female socket contacts and solder them inside the 
receiver. At the other end, outside the radio, I will install a 
connector with male contacts to plug into the power supply.  Maybe I'll 
use octal plugs/sockets. Maybe something else - but that's the plan.