(c) 2004,2008 Peter McCollum
Observed Serial Numbers
This section lists ranges of serial numbers
that have been observed for various equipment. Included are notes about
markings or feature variations.
2227-2781 and 2973-3417 SST-1-D, numbers mentioned in documentation
4587 SST-1-D, with RDR marking inside
6802 SST-1-G
5304 SST-1-E, packing list dated 3/12/47
5402 SST-1-E
1829-2728 SSR-1-D, numbers mentioned in documentation
713 SSR-1 (no letter??)
4870 SSR-1-G (power cable missing)
5037 SSR-1-G (power cable not original)
5126 SSR-1-G
5643 SSR-1-G, packing list dated 3/12/47
5718 SSR-1-G
6647 SSR-1-G
2350-5349 SSP-1-D, numbers mentioned in documentation
3129 SSP-1-D
3372 SSP-1-D, packing list dated 3/12/47
4923 SSP-1-D
(none) Case is somewhat rough/crude from the casting process. Lid marked "DET B-1 MIAMI FLA". Lots of hand-wear on knobs. Key knob is a more rounded shape than later models. Serial was carefully removed from panel. The base of the FT-243 socket is brown, not black. Ant. current lamp housing has larger knurling than later models. All binding posts stamped with "RDR". Power plug is brown, not black. Front panel lettering is smaller than later models. Inside show signs of repair. Tubes have 1964 and 1966 dates.
150 “RDR” marked binding posts. Front panel only, mounted on a plaque given to a retiree.
523 Rounded key knob, “RDR” binding posts, “MWO 39”.
3336 "RT-3" stenciled in white on top and bottom, MWO "39" dated 25-Apr-66. Lid casting says C-8355-B D605A B/Z W. Box is casting C 8356 RFO 95. "0-43" marking on tubes (late 1950 ?).
3767 Case shows some 'roughness' from the casting process. 2E26 tube marked "8-52". 6AC7 is marked "2-09".
4324 Bottom case corners are ‘semi-sharp’.
4765 RT/A-3 conversion (see below).
4958 RT/A-3 conversion (see below).
4961 2E26 has "3-04" marking (early 1953 ?). No "RDR" markings.
5301 RT/D-3 conversion (see below). MWO 39.
5724 RT/E-3 conversion (see below). MWO 39.
5844
5884 Case has MWO sticker (1966), but no diodes installed, and Rcvr post has shorting wire.
5903 "RT-3" painted on lid, no plate.
6093 Has a metal MWO sticker "MWO 39 10/22/69".
6122 Modified to be an RT/A-3 (see below).
6283
6328 Modified to be an RT/A-3 (see below).
6400
6487 Lid marked "RT-3" in small orange lettering. Letter "H" stamped in upper-right corner of lid. "MWO 39" stenciled above ID plate on panel. Case is smooth and clean - no 'roughness' from the casting process. Tubes dated Jan/Mar 1964.
6520
6815 Brought back from Germany c.1967.
3405 (Number hand-written on RT/A-3 lid.)
4765
4958
6122
6281 (Number hand-written on RT/A-3 lid.)
6328
5301 The case was formerly an RT/A-3 unit - it has the yellow stripe, plus a portion of the “A” schematic is still inside.
? (no number)
5724 “MWO 39” stenciled above ID.
2xx A note on the bottom plate reads “THIS UNIT WAS TREATED WITH FUNGICIDAL LACQUER MARCH 1950”. No “RDR” markings.
477 Tube date codes range from 1948-1951. A note on the bottom plate reads “THIS UNIT WAS TREATED WITH FUNGICIDAL LACQUER MARCH 1950”. No “RDR” markings.
40 Marked with two MWO numbers. P.S. #40 exists also.
70 Has power supply, also.
86
328 Found in Greece. P.S. is #354.
? (number removed)
? (number removed) Tube date codes include 1950 and 1951. The two 0B2 tube sockets are labeled “0C3”, although the 0C3 is an octal type, and the sockets/panel don’t appear to have been modified.
? (number removed)
2020 [Unit pictured in manual, and labeled "RR-2", not "RR-2B".]
(?) Serial # has been removed, but was probably 2 digits. Panel was originally marked “RR-2”, but the “B” was added in white ink. “RDR” marking on knobs and binding posts. Bottom edge perimeter of case is a sharp corner, not rounded.
(none) Looks like it never had a serial # marking.
(none)
3039 Originally marked “RR-2”, but “B” was added.
3486
3973 Lid marked "RR-2B" in small orange lettering. Sticker on case "Dec 7 1968". Bottom edge perimeter of case is a sharp corner, not rounded. Knobs have "RDR" stamped into them.
4029 Gain and tuning knobs stamped "RDR".
6690 Lid marked "RR-2B" in small orange lettering. Knobs do *not* have "RDR" stamping.
7175 Front panel only, mounted on a plaque given to a retiree.
8046 Brought back from Germany c.1967.
3443
3460
173 [Unit pictured in manual.]
249 Meter does NOT have the “RDR” logo.
320 Meter has the “RDR” logo. Bottom perimeter of case edges are sharp.
2155 Meter is marked with "Burlington" logo (not RDR).
3
32 MWO 11-5820-474-35/1
?1 2-digit serial.
102 No ID plate on lid, and no holes. Number "2" stenciled large on box.
105 ID plate on lid, also says "Vitro Electronics".
136
137 Admiral Corp. Label on panel reads: "MWO 11-5820-474-35/1, Applied at Depot, Checked 8231 - RJM"
163
255
266
283 FR-36-039-C-4-44845(E) Admiral Corp. Serial is on lid only - panel serial was removed.
291 MWO 11-5820-474-35/1
298 No ID plate on lid, and no holes.
307 MWO 11-5820-474-35/1. No tag on cover, and no holes.
336 Silk-screened ID plate. Lid has "SET-1" stenciled on it.
340 No ID plate on lid, and no holes. "SET 22" stenciled on box.
344
378
430
443 Has "21" stenciled on cover.
456 Cover only. Stick-on label.
471
476
499 Has cover #456.
540 Shop tag stamped operational, dated Feb/Mar 1986.
544
559
666
709 ID tag screwed onto lid. Serial # on panel is painted, not engraved. "Rough cast" case.
737 FR-36-039-C-5-14591(E) Admiral Corp. Lid's ID plate is self-adhesive foil, but there are holes and captive nuts for original ID plate. Front panel stencil marking: "MWO-11-5820-474-35/1". Front panel sticker: "Overhauled Tobyhana Army Depot 5-8-81".
801
102A Oklahoma Aerotronics, Inc. DAAB 05-69-C-1302. Cover is stenciled "CO C" above ID plate, and "A30" below.
124A
220A
324A
411A Oklahoma Aerotronics, Inc. DAAB 05-69-C-1302. Has "13" stenciled on cover. Flat-black paint.
418A Has lid # 484A.
484A Lid only.
556A Oklahoma Aerotronics, Inc., DAAB 05-69-C-1302.
685A 05-69-C-1302
none
none No serial numbers. Lid has no ID plate, but screws are in the holes, then varnished over.
? No data plate - has 2755 stamped in the same spot.
15
66 Mis-matched cover.
70 No tag on cover, and no holes. White insp. stamp on panel. Tuning window is clear, not yellow. "35" is stenciled on cover and case.
121 "Receiver Radio R-1004/GRC-109" stenciled in white on the lid. No ID plate on lid. Panel says only: R-1004/GRC-109, Ser. No. 121.
134
206 Marked "OD 5" on cover.
214 order # FR-36-039-C-5-14591(E), lid plate is screwed on. Serial etched on front panel.
273 FR-36-039-C-4-44845(E)
277
293 No ID tag on lid. Front panel is painted (silkscreen), and serial # is engraved.
299 Has "SFEP" stenciled in blue on lid.
344 ID plate on lid (screwed on). FR-36-039-C-4-44845(E) Admiral Corp. Tuning dial window is clear, not yellow. No serial # on panel - panel may have been repainted? "OD 5" stenciled in white on lid. Case is somewhat crudely finished, and has four 'support bosses' built in to the top edge of the casting.
373
415
439 Shop tag stamped operational, dated Feb/Mar 1986.
440 ID plate on lid.
497 Stick-on label on lid. Overhauled by Tobyhana, date code "2117". Front panel ID plate has painted-on serial #. Serial is also engraved in large numbers in the lower-right corner of panel.
505
562
566
684
707
709
726 Screw-on ID plate on lid.
780 Silk-screened ID plate.
784
804 Lid only.
893
1246 ID sticker maybe was added later – rcvr appears to be an older version, possibly an RR-2B, with an ‘RDR’ gain knob.
93A Oklahoma Aerotronics, Inc., DAAB 05-69-C-1302
118A Metal ID plate on lid, with screws. This lid is on radio #141A. ID plate has spelling error: "reciever". DAAB 05-69-C-1302.
141A Has lid #118A.
220A
380A
409A
478A
637A
20
86 No ID on lid, panel ID is painted, panel serial is engraved.
141 Case is crudely finished, with pebble-grain top. ID plate screwed on. FR-36-039-C-4-44845(E) Admiral Corp. Alum. sticker: "OVERHAULED TOBYHANA DATE 1119". "WHO5AO" stamped into panel.
152 ID plate on lid (screwed on).
192
194 Has "12" stenciled on side of case.
250
306
307
346 FR-36-039-C-4-44845(E) Admiral Corp. ID plate on lid (screwed on). Sticker ID on panel, no serial #.
347
376 "17" stenciled on lid. Date code of late 1962 on internal parts.
378
429
463 No tag on lid, and no holes.
469
528 Rebuilt by Tobyhana 6/10/81.
603 Shop tag stamped operational, dated Feb/Mar 1986. Overhauled sticker dated 6079 Tobyhanna Army Depot.
714
900