BC-639-A VHF 100 - 150 Mc AM Receiver

Two Parts

• The top box has a black ID plate: SIGNAL CORPS BC-639-A a red ID palte : R 5032A, Ref No 10D/259

and a paper sticker: 5820-644-0961     E 281 RA0089, Receiver BL-639A  0251 (aprox 38 lbs)
• The lower box has a black ID plate SIGNAL CORPS, RECTIFIER RA-42-A;

and a red ID plate with POWER UNIT, TYPE 5003 A, REF No 110K/498;
and a paper sticker with: PCSP 30I, 66233, 1803
and a string attached tag that says "Low Power Out PS".  (aprox 26 lbs)

Many years ago I removed the PS power cord connector and have hard wired a 3-wire power cord.  Also made a PS to radio jumper cable but there is no shell on the connector so high voltage is exposed, use caution!

Manuals & Documents

• T.O. 21R2-3BC639-22 1 Nov 1942 + Revised 10 Sep 1956 (copy)
• AN 08-40BC639-2 Handbook of Maintenance Instructions for Radio Receiver BC-639-A, RESTRICTED (For Official Use Only) Approved 1 November 1943, Revised 14 Aug 1944 (origional in excellent condition)
• T.O. 31R2-3SCR574-106, Handbook, Preventive Maintenance Instructions, Radio Receiver, BC-639-( ), 15 September 1955 (very good copy)
• Army Air Forces, Technical Order No. 08-10-191, Instruction Book, For, Operation and Maintenance, of, Rectifier RA-42-A, and, RecitifierRA-42-B, (and table mounted Navy Adaption), Manufactured by, BENDIX RADIO, Division of Bendix Avaiation Corporation, RESTRICTED, June 24, 1943 (very good copy)
• Technical Order, No. 16-40BC639-22, 30 April 1948, Department of the Air Force, Headquarters United States Air Force, Washington, Modification to Suppress Noise - BC-639-A and BC-639-B, data at bottom is 17 Jul 51. (good copy)
• Technical Order, No. 16-40BC639-21, (hand written = 31R2-3BC639-502), 9 August 1945, Headquarters Army Air Forces, Washington 25, D.C., Modification of Receiver to Provide Loudspeaker Operation - BC-639, date at bottom 11 Jun 51 & the RESTRICTED legend has been double lined out with signature block. (original)
• Technical Order, 31R2-3BC639-501, 30 April 1956, Department of the Air Force, Modification of Rectifier RA-42-( ), Radio Receiver BC-639 to install ventilating pluge in the RA-42-( ) case for cooling. (good copy)
• T.O. 31R2-3BC639-22, Formerly 31R2-3SCR574-42), Handbook of Maintenance Instructions, Radio Receiver, BC-639-A, F34601-73-D-1388, 1 November 1943, Change 7, 1 Aug 1973  (good copy)

Condition

The power supply seems to work OK but when a LS-166 type speaker is connected to the Monitor or Line jacks there is no sound.

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