EB5AGV's SP-600 Known Units Information

Keep them glowing!

Here you have some information about different units of the SP-600 series. Thanks to Benjamin D. Hall for providing some of them. Please, e-mail any corrections or information about new units to add to the list. I'm looking for all kind of SP-600 mods and magazine articles references to include them here. Thanks!.


Model: SP-600-J
S/N: 1170

Comments:
- Retrofitted with product detector mod as outlined in QST, 1970.
- Someone attempted the crystal option but didn't complete it.
- Khaki coloured front panel.
- Can't remember what type of capacitors it has.


Model: SP-600-J-3
S/N: 5110

Comments:
Rack mount military unit.


Model: SP-600-JL
S/N: 1765


Model: SP-600-JL-16
S/N: 6827

Comments:
R274/FRR
S/N 969, Order 3376-PHILA-52

- Medium grey front panel.
- SO239 antenna connector.
- Retrofitted with crystal option.
- Don't know what type of capacitors it has.


Model: SP-600-JLX-2B
S/N: 2181-U

Comments:
Frequency coverage starting at 100KHz till 29.5MHz.


Model: SP-600-JX
S/N: 1806

Comments:
This is a military unit with the underneath sprayed with the anti-fungus varnish. The capacitors fitted are not the dreaded black tubular. They are made by Astron and have a silvered colored body with a transparent plastic cover around the tubular body. The 0.01 uF caps are labelled ASTRON CP09A1 KF103K3 AAQFP 6-01-10 .01 - 600. The 0.02 caps are similar and are also made by ASTRON. They all look to be factory installed as the varnish is still covering the solder joints. The caps inside the IF cans however are disc ceramic. The antenna connector looks to have been factory modified to an SO-239 style to accept coax cable. This one is housed inside a Hallicrafters CY-1345/GR cabinet with US Army Signal Corps labelled on it. It has the regular dial lock.


Model: SP-600-JX
S/N: 1823

Comments:
It has the yellow colored anti-fungal coating on top and on bottom of the chassis. It has the metal astron caps (the same ones that are in a lot of R390A's) and ceramic caps in the IF's. It still is in the original condition when the army decommissioned it years ago. I plan to restore it soon, although it is not at all in bad shape.


Model: SP-600-JX
S/N: 2018

Comments:
S/N 245, Order 1689 PHILA-51-01

Has some original disc caps, many red and brown micamolds, and GREY fugly color-coded tubular pieces of sht, all of which are coated with the original tropical varnish, had official-looking mod consisting of resistor ntwk at V6 and V8 to coax to BNC on rear apron, no clue what it was for (previously asked group, nada), no other mods, is complete.


Model: SP-600-JX
S/N: 2139


Model: SP-600-JX
S/N: 2469

Comments:
Rear Panel has:
IF Output, AVC O/P, Audio O/P, 3/8 A fuse, 1.6A fuse.
Nothing else special, it HAD the infamous BT capacitors, but they are ALL gone (yep, even the ones under the RF deck and in the turret).


Model: SP-600-JX
S/N: 2571

Comments:
R274A/FRR
S/N 597, Order 1689-PHILA-51-01

It is really heavy (it has an enormous case). Works _great_.The letters 'JX', '2571' and '597' are stamped into the plates, everything else is printed on.


Model: SP-600-JX
S/N: 3146


Model: SP-600-JX-1
S/N: 1601

Comments:
It is mint and all original (until I finish replacing all of the black beauty caps)


Model: SP-600-JX-1
S/N: 4609

Comments:
R-274A/FRR
S/N 1866, Order 3376-Phila-52

Has 'Dial Lock' rather than IF gain. Brown Ugly Caps. Even has top cover intact!.


Model: SP-600-JX-1
S/N: 4658

Comments:
R 274A/FRR
S/N 1571, Order 3376-PHILA-52

This one is a rack mount (in cabinet now), and has the dial lock knob.


Model: SP-600-JX-6
S/N: 5911

Comments:
R-274B/FRR
NObsr-52039, 13:CHC

Has penciled date of 4-28-57 in 2 places on chassis.


Model: SP-600-JX-6
S/N: 6262

Comments:
R-274B/FRR

Has dial lock. Rack mounted.


Model: SP-600-JX-6
S/N: 15438

Comments:
R-274B/FRR
NObsr-52039, 1983:CHC

Dial lock, black caps, rack mounted, missing 2 of three 'top hat' tube retainer rings, missing one screw on crystals retainer assembly, no top and bottom covers. Otherwise complete and in excellent working condition, scratches and some paint chipping on face.


Model: SP-600-JX-7
S/N: 4250

Quite good conditions, apart from some scratches.


Model: SP-600-JX-10
S/N: 7344

Comments:
It was full of the black uglies, and has the IF gain mod rather than a dial lock. The IF gain is an obvious mod, install was real ugly, but it does have a stick-on IF Gain label over the dial lock marking on the front panel.


Model: SP-600-JX-10
S/N: 9837

Comments:
Lots of black uglies but in good shape. Seems to have been well looked after in its working life (at an HF monitoring station, I think). No defective caps so far, but VFO/Xtal select switch is broken. Big deal to get in and change it. Must do so soon, however. Non-mil radio. Will be a very nice radio when its fixed.


Model: SP-600-JX-14
S/N: 1061

Comments:
R-274C/FRR
Order 3376-PHILA-52, US Navy Property 82858-000890

Has tuning lock, crystal deck no crystals. Looks original. Doesn't work. Couple of lousy solder joints.


Model: SP-600-JX-14
S/N: 7600

Comments:
Military Name Plate Data:
Signal Corps R-542/FRR
SN 304
Order 3376-PHILA-52

The set is in generally good condition.


Model: SP-600-JX-14
S/N: 8289

Comments:
R-274C/FRR
S/N 598, Order 3376-PHILA-52

Comments:
Came with dial lock, black caps (all have been replaced). Front panel (originally gray) had been repainted ugly beige, engraving and all (now restored to its original glory). No cabinet, but had top/bottom covers.


Model: SP-600-JX-14
S/N: 8340

Comments:
R-274C/FRR
S/N 532, Order 3376-PHILA-52

Uses the tubular caps (but not for long). The input conn. for the antenna is a standard UHF. I thought these used twinax conn.? Gray front panel, white letters engraved.


Model: SP-600-JX-14
S/N: 9422

Comments:
Very badly treated unit but one which has some promise if I can find or manufacture the parts: SP-600-JX-14, Ser # 9422, US Navy Tag # 62858-000890. Unit is missing AF and RF Gain control knobs, crystal selector knob, ball-end toggle switches, VFO cutover switch, tube shields, tube hold down clips/posts, top and bottom covers, and much I have not detailed.


Model: SP-600-JX-14
S/N: 9903

Comments:
It's a bit different from any others I've seen. It's a rack mount with a gray front panel. It has a Collins transformer on the back mounted to a bracket 600 ohm to 8 ohm for the speaker with a 1/4" phone jack. Instead of the middle knob on the left side it has a toggle switch marked 'Meter RF and AF' which switches the meter. The most unusual thing is a rack and pinion operated switch for two antenna connections. It's located on the top right of the front panel. It's operated with a black lever similar to a transmit/receive switch. It uses a UG201A/U connector both front and back of the switch. The pinion moves the rack fore and aft to select the input on the tee shaped switch. With the rear connector inside the radio I suppose it is used for a permanent antenna connection and the one on the front panel might be for testing? There is no if gain control but it has a nice bfo setup when the switch is in the ssb position. No markings for cw just ssb. The chassis seems to be all stainless steel. I just had it on and was listening to the guys on 3885 being maliciously interfered with by the ssb goon squad. It sounds a lot better than my Drake R8.


Model: SP-600-JX-17
S/N: 956

Comments:
R-274C
S/N 956, Order 3376-PHILA-52

Not a dual diversity model, tuning lock instead of IF gain. Only real oddity is that it came with a tripple triode product detector mounted under the rear deck near the if out strip. its not a hack the bracket has a part # stamped into it.


Model: SP-600-JX-17
S/N: 14377

Comments:
Has a decal just to the rear of the serial number tag stating it to be the property of the "Federal Communication Commission". I purchased it this fall from a ham who restored it after what seems to be a lengthy basement storage.
It was manufactured with ceramic disc caps and a few tubulars that were swapped out by previous owner. It has the IF Gain mod with the stick-on label and the four red knobs. A not connected to anything toggle switch of the same type used elsewhere on the panel was added to the upper left of the panel, between the meter and tuning bezel, even with the top edge of the bezel. It is an excellent performer and has great audio. I listened to the final broadcast of Radio St Helena for over 40 minutes with only minor corrections necessary.


Model: SP-600-JX-17
S/N: 14657

Has NO 'Black Beauties' (Hoorah !!). It has SO-239 connectors on the back for external VFO, BFO and IFO (IF Oscillator) signals. Also one more not identified that I have to trace out to see where it goes.


Model: SP-600-JX-17
S/N: 14984


Model: SP-600-JX-17
S/N: 15718

Comments:
Black ugly caps, not a military unit


Model: SP-600-JX-17
S/N: 16517

Comments:
No military contract number shown on name plate; has dial lock instead of IF gain control; no other unusual mods or features; original Hammarlund cabinet.


Model:SP-600-JX-17
S/N: 16950


Model:SP-600-JX-17
S/N: 16955

Comments:
IF Gain, ceramic caps, 2 of 2 tube retainer rings missing. Otherwise unit is complete with original cainet and matching speaker. Cabinet and matching Hammarlund speaker are painted black. Unit looks like new inside and out. Has original wrenches. This unit was made for the Military but probably purchased by a Hammarlund employee. I am the third owner. I bought it 4 weeks ago from a man who lives about 16 miles from where Hammarlunds were made. (although I was told by the fellow that this unit was probably not made at his local Hammarlund plant). Has black dial skirts with raised aluminum colored numbers. I've been informed that this style of dial is known but not often extant.


Model: SP-600-JX-17
S/N: 17234

Comments:
Disk caps, not a military unit, has IF output, bfo, ifo, and remote jacks (factory config). Instead of a dial lock,it has an IF Gain control (the glued-on label is long gone). It has a coaxial antenna connector (SO-239), not a 'Twinax' connector.
The 'I.F. Gain' circuit appears to have been a 'depot mod'. It's neatly done, but the wiring is routed alongside the laced wire harness, not in it. Also, the panel was modified with a label that was glued on. This might explain why all JX-17's aren't the same.


Model: SP-600-JX-17
S/N: 17475

Comments:
Never had Black Beauties Factory Mods: External oscillator inputs for HFO, IFO, and BFO via SO-239's on rear panel. Two additional controls: 'IFO' (two positions) 'EXT' 'INT', 'BFO-AVC' (4 positions) 'EXT-SLOW' 'EXT-FAST' 'INTERNAL SLOW' 'INTERNAL FAST', 'HFO' switch has an added 'EXT' position, dial lock replaced with IF gain control with paste on metal label, frequency control unit uses 7-pin miniture tube rather than 6AC7.


Model: SP-600-JX-17
S/N: 17890

Comments:
It needed no restoration whatsoever save some weak tube replacements. It is all original, looks very good and works like new.


Model: SP-600-JX-17
S/N: ????

Comments:
Has the IF gain control also. That is what is shown in the ckt diagram as well. Also something different on the back panel. It is full of those black caps. Ug!.


Model: SP-600-JX-21
S/N: 20315

Comments:
Operational and complete set, no black uglies - all disk ceramics of the 0.01 mf value (post-1956 standard). Tuning lock, IF and AVC out, 100 ohm bal antenna input. Good shape, except that 'The BA Butcher' hacksawed the vertical U-bar stays on the chassis sides off. Non standard cabinet - perforated metal w/o lid. Cracked but complete fuse cover, no hex keys. Filter electrolytic changed app 1980 (Cornell-Dubilier 20+20+10+10 mF). Some scuff marks from the cabinet bolts, and pencil 'doodling' in the engravings, otherwise the front panel is ok. Manufacturing date (hitherto) unknown, but the bathtub caps has a '10-58' stamping. Rumor says it was used for the Stockholm Radio maritime service, but not confirmed (yet).


Model: SP-600-JX-21
S/N: 20661

Comments:
Picked up in the late 60's from military salvage - used it for many years then it went into storage until now.


Model: SP-600-JX-21
S/N: 21670

Comments:
Original manual dated 1963. No 'Black Beauties'. IF output. Purchased new in January 1964 (incoming inspection tag dated 23 Jan 64 still attached. Inspection tag carries the logo of the Swedish Telecommunications Administration, but by all probability not used in their stations, probably bought by them as a cover for use in the Swedish SIGINT centers, as a Swedish military nomenclature decal still is readable on the chassis. I am the third known owner, the receiver has been in storage for at least one decade


This one is my unit. More information at EB5AGV's SP-600 Boatanchors list articles

Model: SP-600-JX-21?
S/N: 54609257

Comments:
Higher S/N reported until now. Perhaps a different S/N scheme?. NO black uglies. No military tag. Currently working although it could benefit of a detailed alignment.


Model: SP-600-JX-26

Comments:
R-274C/FRR
S/N 1612, Order 3376-PHILA-52

Its last owner was the Pacific Missile Range (Navy) at Point Magu, Ca. I rescued it from a surplus store where it had been dropped on its face bending the front panel in. I hammered it flat and repainted it. Inside it was in very good condition except for the cooked resistors in the bias rectifier circuit. I had to replace a couple of micas in the turret but it still has all of its 'black uglies' and it works fine. I added a low distortion heterodyne detector (solid state) which gives great CW/SSB and hi-fi AM. It's reversible of course, no new holes, no irreplaceable parts removed.


Model: SP-600-JX-26
S/N: 10878

Comments:
R-274C/FRR
S/N 1766, Order 3376-PHILA-52

Black uglies; I've replaced almost all.


Model: SP-600-JX-26
S/N: 11405

Comments:
R-274C/FRR
S/N 3200, Order 25693-Phila-53

It had black uglies.


Model: SP-600-JX-26
S/N: 11865

Comments:
Clean of Black Uglies apparently a military unit, no modifications visible. Unit is in excellent electrical and cosmetic condition.


Model: SP-600-JX-26
S/N: 11918

Comments:
On the tuning capacitor cover there is a sticker that says: 'FOR DIRECTION FINDING OPERATION - REMOVE WHITE-BLACK LEAD FROM SCREW TERMINAL NUMBER 8 ON TERMINAL BOARD E13 AND CONNECT TO SCREW TERMINAL NUMBER 7' The radio seems to be complete except for the missing Allen wrenches and one of the metal pop-in covers on the main tuning box. The power cord is decomposing quickly so that will have to be changed before proceding. I do have the re-cap kit that Roy Morgan was offering awhile back, so when I have some time and room on the bench, it will be ready for the blackcapectomy. Stay tuned.


Model: SP-600-JX-26
S/N: 12030

R-274C/FRR
S/N 2402, Order 3376-Phila-52

Comments:
This receiver came through a friend who got it from MARS (I believe in Germany) while he was in the Air Force. The radio came complete with Black Beauties which have been replaced. No other mods noted. The radio is currently being restored and recapped. 12/1/99


Model: SP-600-JX-26
S/N: 12828

Comments:
It has black beauty capacitors in it and the dial lock. It has an aluminum front panel which is in such bad shape that it is not fit for refinishing. I'm told that the malady the panel suffers from is called intragranular corrosion. This SP-600 has no cabinet. My SP-600 condition is currently 'bad', due to rust and corrosion, but it is complete. A previous owner bolted on an outboard product detector. I haven't turned this SP-600 on yet, because I'm sure that it wouldn't work if I did. Nothing else noteworthy to report about it.


Model: SP-600-JX-26
S/N: ????

Comments:
R-274C/FRR
S/N 1580, Order 3376-PHILA-52

My unit has the Tuning Lock knob, and seems to be in all respects a typical unit, with no unusual features. However, one comment is that it does have some unmarked BNC connectors on the back (three, to be exact). Two of these have a short (3 inch) piece of Coax to connect two of these connectors/jacks together.


Model: SP-600-JX-37
S/N: 20854

Comments:
This rcvr is a rack-mount model with top and bottom cover plates. The present power transformer is a Hammarlund model 31029.2 (as far as I can learn, the JX-37 models were originally made with 25HZ transformers). It has a dial lock, and NO black caps; they all are disc ceramics.


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