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Vintage Amateur and Military Radio Amateur/military receivers and transmitters, morse, and any other related vintage comms equipment.

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Old 26th Jan 2010, 10:46 pm   #1
cougar_lou
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Default AR88 Control Unit Type 88

Greetings to all.

The following comes from the Air Ministry document AP2567A,Receivers type R1556,R1556A,R1556B.


"One of the modifications to the standard AR88 or AR88D was the addition of a plug, type R to the rear chassis. This plug is connected in series between the resistor R55 (in the RF/IF gain control circuit) and earth. The control unit type 88 can be connected to this circuit by a socket type C; this arrangement provides sidetone in the receiver. A short circuited socket, type C is also provided so that when sidetone is not required, the normal RF gain control circuit can be restored".


Has anyone any information on the elusive Control Unit Type 88 or Soket type C etc?


Brian G.
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Old 26th Jan 2010, 11:49 pm   #2
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Default Re: Ar88 control unit type 88

You could always try the RAF Hendon archive.

They might have something on it.
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Old 26th Jan 2010, 11:57 pm   #3
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Default Re: Ar88 control unit type 88

I traced the wiring on my own AR88 which is the R1556A variant some time ago and have attached a rough sketch.

Socket type 'C' is a flat mains type two pin socket which mates with a similar plug screwed to the chassis of the AR88. I will take a picture some time and post it here.
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Old 28th Jan 2010, 10:32 pm   #4
cougar_lou
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Default Re: AR88 control unit type 88

And you were kind enough to send me a copy back then. We were seeking info on the 88 control unit as well.

Thanks,Brian G.
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Old 6th Feb 2010, 10:32 pm   #5
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Default Re: AR88 Control Unit Type 88

Some pictures.
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Old 13th Feb 2010, 1:08 am   #6
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Default Re: AR88 Control Unit Type 88

Ta muchly Graham,Brian G.
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