Military Wireless Museum
The Eddystone wall, the display in the museum
The sets.
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and now, in greater detail with brief descriptions
The S.700 or IMR54 receiver, as used on the Queen Mary liner, with a 'normal sized' 730 sitting on top.
(The 730 itself is unique in that its a 730, serial number 00001)
ALL WORLD TWO: 1936. 0-V-1 battery, headphones. 15-52 metres with the two coils supplied (others extra).
Probably the �Cinderella� of Stratton in the late �30s, the A.W.2 is described in E.S.W.M. No.3 (ibid.), offered as a kit (price �3 7s 6d plus valves and case) or ready-built and tested for �5 5s complete. It continued in the shops until the outbreak of World War 2, by which time its price (ready-built) had fallen to �3 17s 6d. To tempt new impecunious S.W.L.s it was offered on Hire Purchase terms complete with phones and batteries for �1 down and six monthly payments of 16s 4d. (The starting pay for an office boy at this time was around 5s weekly). All World Two 1936-39. A mains hybrid was described (heater transformer, HT battery) but never mentioned again. Used by Voluntary Interceptors (V.I.s) during the early war period, before H.R.O.s were bought from U.S.A. (V.I.s were civilian hams and S.W.L.s who monitored enemy Morse signals from their home QTH for Bletchley Park cipher school to decode.) (from EddystoneUserGroup QRG)
An early set here, 1932 ish. The All Wave Four.
Stratton & Co.Ltd.; Birmingham. TRF with reaction (regenerative). Coverage 150 kHz - 24 MHz (2,5" vertical plug in coils: blue coil 13-26m, yellow 22-45m, red 40-85 m,green 250-500m), Igranic Indigraph dials, aerial tuning coupling condensor; tropicalised diecast sectionalised aluminium case with hinged cover. Eddystones' earliest "professional grade" model successfully used by British Arctic Air Route Expedition 1930.
The All World Four.
1934, TRF, AM, 140 kHz - 30 MHz with plugin coils. Tropicalised diecast cabinet similar to that of the "All Wave Four", hinged lid, smaller (1 1/2") plug-in coils covering 140 kHz - 30 MHz.
The 358 with plug in coils
Coverage 40 kHz - 31MHz in 10 bands. Wave band is changed by plugging in different coil units. No crystal filter, note the lacking switch left of "tone" and "BFO" controls (see 358X with crystal filter). Matching external Power supply S390 supplying 6V LT and 175/180V HT. Army tube designations: ARP34 ARTH2 ARP34 ARP34 AR21 ARP34 VT52 ZA3489. Navy designation Receiver B34.
the general coverage S 504, awaiting restoration.
Communications receiver covering 580 kHz - 30,5 MHz in five bands (580-1340 kHz, 1,34-2,9 MHz, 2,9-6,5 MHz, 6,25-13,4 MHz, 13,2 - 30,5 MHz), AM, CW (BFO). S-Meter tuning indicator, Noise limiter, Crystal filter.
the domestic version, the S 556, the first pre war set.
Communications receiver covering 580 kHz - 30,5 MHz in five bands (580-1340 kHz, 1,34-2,9 MHz, 2,9-6,5 MHz, 6,25-13,4 MHz, 13,2 - 30,5 MHz). Similar to 504 but with two integrated speakers and magic eye tuning indicator.
The three band S-640 receiver, general coverage.
Year: 1947�1949. EF39 ECH35 EF39 EF39 6Q7GT 6V6GT EB34 EF39 6X5GT. Shortwave receiver covering 1,7-32 MHz in three bands (1,7-4,5 MHz, 4,5-12,6 MHz, 12,6-32 MHz), AM, CW (BFO); optional separate speaker, 669 S-meter and 687 6V accumulator.
The Tea Planters special, the 659, with matching speaker
Year: 1947/1948. : EF39 6K8GT EF39 EBC33 EM34 6V6GT EB34 6X5GT. Communications receiver covering 520 kHz - 30 MHz in four bands (522-1220 kHz, 1,2-2,75 MHz, 5,8-13 MHz, 12,8-30 MHz), AM, magic eye tuning indicator, noise limiter (switch on rear of set). Usually supplied with huge console speaker. Dial later used for much more common 670.
The four band S-670 receiver, general coverage.
Year: 1948�1954. UAF41 UCH41 UAF41 UAF41 UAF41 UL41 UL41. Receiver used as "cabin set" on board of ships for first class passengers and ship's officers; Coverage 522 kHz - 30 MHz in four bands (522-1220 kHz; 1,2-2,75 MHz; 3,7-10,6 MHz; 10,5-30 MHz, not the gap in the range of maritime communications bands), AM only.In many sets, spare dials made for the 659 receiver have been used (mediumwaves marked in meters), the dial back-plate carried the designation "Marine Receiver 659/670" in the same place of the magic eye.
The later vesion, the six band S-670C receiver, general coverage.
Year: 1962�1964. UAF42 UCH42 UAF42 UL41 DM70. Receiver used as "cabin set" on board of ships for first class passengers and ship's officers; Coverage 150 kHz - 30 MHz in six bands (150-350kHz; 500-1110kHz; 1,11-2,5MHz; 2,5-5,5MHz; 5,5-13MHz; 13-30 MHz), AM only. New "slide-rule" dial. Successor model 670C/1, sold under Marconi "Elettra" label (MIMCO 2232B). A variant with high power 10W audio output has been sold as Marconi "Elettra" (MIMCO 3873A).
The 680x general coverage hf receiver.
Frequency Coverage :- 480 kc/s to 30 Mc/s in 5 ranges. Range 1 : - 30 to 12.3 Mc/s. Range 2 : - 12.5 to 5.3 Mc/s. Range 3 : - 5.7 to 2.5 Mc/s. Range 4 : - 2.5 to 1.11 Mc/s. Range 5 : - 1120 kc/s to 480 kc/s. The intermediate frequency was permeability tuned to 450kc/s, the coupling between the coils being varied mechanically by a panel control to give a wide range of selectivity. The BFO had a range of plus or minus 3 kc/s. Aerial Input : - 400 ohm (nominal). Power Supply : - 100 and 200-250 volts AC (40 to 60 c/s).
The three band S-710/B receiver (All World Six), general coverage.
Year: 1949. General coverage receiver, 480 kHz - 30,6 MHz in four bands (480-1460kHz; 1,4-3,8MHz; 3,7-10,6MHz; 10,5-30,6MHz). AM only. Battery powered, integrated vibra-pack, matching 687 6V accumulator. In some models, spare dial glasses from 659 have been used, they are marked "All wWorld Six" in the left upper corner.
The 730/4 general coverage set, used by the military.
The receiver is a 15 valve superhet, having 2 RF stages. It uses 7 and 9 pin miniature valves throughout, apart from the rectifier and voltage regulator, which are octal. The set is designed to work off mains power or batteries. Sensitivity is given as AM better than 5uv, CW better than 2uv at 15db S/N at 50 mw output power. Power output at 1 watt into 2.5 ohms gives typically 18% distortion. Cathode follower output is at 68 ohms. There are 5 tuning ranges as follows: Range 1 12.3 - 30 MHz Range 2 5.3 - 12.5 MHz Range 3 2.8 - 5.3 MHz Range 4 1.1 - 2.5 MHz Range 5 0.43 - 1.1 MHz. The intermediate frequency is 450kc/s.
A special 730 now, a 730 (no /) and serial number 0001.
The rather nicely coloured S740, general coverage sw rx.
Year: 1950�1954. EAF42 ECH42 EAF42 EAF42 EL42 EAF42 EB41 EZ40. General coverage receiver, covers 480 kHz - 30.6 MHz in four ranges (480-1460 kHz; 1,4-3,8 MHz; 3,7-10,6 MHz; 10,5-30,6 MHz), AM, CW (BFO), noise limiter, S-meter. Similar to 710/B, but with BFO/NL.
The 750 set now............
Year: 1950�1958. 6BA6 ECH42 6AM6 ECH42 6BA6 DH77 6AL5 N78 6BA6 5Z4G VR150. Superhet, double/triple conversion; IF-Freq 1620/85 kHz. General coverage receiver, covers 480 kHz - 32 MHz in four bands (480-1465 kHz, 1,7-4,5 MHz, 4,5-12 MHz, 12-32 MHz), AM, CW (BFO). Matching 811 speaker, 687/1 6V DC vibrator power unit, 669 external S-meter.
The 770R VHF set now............
Wavebands: Range 1 114 to 165 MHz Range 2 78 to 114 MHz Range 3 54 to 78 MHz Range 4 39 to 54 MHz Range 5 27 to 39 MHz Range 6 19 to 27 MHz. IF Frequency: 5.2 MHz
the LW/MW/VHF 820 Tuner, supplied to be fitted into ones own hifi unit .....
Year: 1955. 6AM6 12AT7 ECH42 6AM6 EM80 6AM6 6AL5 EZ41. FM broadcast band tuner covering 87.5 - 100 MHz, two MW presets (one in 610-960 and one in 960-1550 kHz range - BBC Home and Light) and one LW preset (one in 150 - 250 kHz range - BBC Droitwich Light). Output only low level for HiFi amplifier. Also sold as Mimco 2294A (9 sets) and with crystal control for Rediffusion.
the general coverage 830 receiver, dual conversion .....
1969-1973. 300 - 30000 kHz. Double Conversion Superheterodyne. 15 Tubes plus Semiconductors. 6ES8 RF Amp, 6AK5 1st Mixer, 6AJ8 2nd Mixer/2nd Osc Iso. Amp, 6C4 2nd Local Osc, 6BA6 1st 100 kHz IF Amp, 6BA6 2nd 100 kHz IF Amp, 6AL5 AM NL, 6AU6 Cathode Follow, 6AT6 AM Detector AGC Rectifier, 6AQ5 Audio Out, 6AU6 Calibrator, 6U8 1st Local Osc, 6BE6 CW/SSB Detector and (2) 0A2 HT Stabilizer plus 4 diodes. Single conversion below 1.5 MHz.
The model 840 receiver.
Only 501 manufactured. EDDYSTONE TYPE S.840: �Economy�communications receiver suggested by Stratton�s agent in the British Dependency of Aden on the Persian Gulf. They were selling lots of the very successful 670 �cabin� broadcast receivers and suggested that a similar set but with a BFO for SWLs would be a good seller. And so the 840 was created. The whole series (840A/840C � ibid.) ran for 15 years and was a great success. 7 valves; 1 RF; 1 IF (450kc/s) BFO; AC/DC 110-250v (work anywhere!) 4 bands, 480kc/s-30mc/s.
The Eddystone 840A now.............
Released 1955. Four wavebands covering 480Kc/s to 30Mc/s. 7 Valves (four UAF42's, UCH42, UL41 plus UY41 rectifier). A.C. or D.C. Mains
The Eddystone 840C .............
Year: 1961�1968. Valves 8: UAF42 UCH42 UAF42 UAF42 DM70 UAF42 UL41 UY41. Superhet with RF-stage; IF-Freq 450 kHz; 2 AF stage(s). Wave bands 480kHz to 30MHz. AC/DC-set 100-250 Volt
The 850 VLF rx..............
Year: 1961/1962. 6BA6 6AJ8 6BA6 6BA6 6AL5 6AU6 6AT6 6AM5 6BE6 5Z4G VR150-30. VLF communications receiver covering 10 - 600 kHz in 6 bands (10-20, 19-40, 40-85, 80-160, 150-310, 300 - 600 kHz), AM, CW (BFO). S-meter, CW audio filter, bandwidth 0,4 / 1,5 / 6 kHz. Used for maritime and submarine communications surveillance, 100 sets produced. Aerial input 75 and 300 Ohm, balanced or unbalanced. Connection for IF output abt. 100 mV suitable for terminating impedances 75-300 Ohm. Audio output: loudspeaker 2,5-3 Ohm, lines 600 Ohm, headphone 2000 Ohm.
A baby Eddystone.. the 870, the POSH set, Port Out Starbord Home, as used in passenger ships cabins etc.
The rather super Model 880 now. This is the 880/3
Two ham band sets now, first the Eddystone 888A
and the EA12 receiver .....
The Edddystone 909A, a set made for the Scandinavian market so very few found in the UK.
the single band 930 receiver .....
the special BBC 930 receiver .....
the general coverage 940 receiver .....
the general coverage 958 receiver .....
The eddystone EC958 is a high stability high performance communications receiver first manufactured in 1972. There are a number of variants /1, /7, /9 for example. Price in 1972 �1137 plus VAT. 10khz to 30Mhz in 10 bands, triple superhet.
the general coverage 960 receiver ..... the first transistorised set
the single channel HF 964/7 receiver .....
the VHF 990R receiver ..... transistorised 27-240MHz VHF set
the UHF 990S receiver ..... transistorised UHF set
the Eddystone Receiver 1002, hf and vhf, mains or battery. Nice set but note no bfo ..........
the Eddystone Receiver 1004A, badged as a Marconi Sentinel.
The 1560R receiver, part of the Marconi Marlin set.
the 1650 receiver 10kHz to 30MHz, AM, CW, SSB.
The 1830 receiver, general coverage, high performance.
The 1837/3 receiver, general coverage.
The 1837/1S badged as Marconi Pacific.
The 1838 receiver, general coverage.
The 1990/R3 receiver, VHF, and 1061B pan scope.
The E series of sets.................................
The EC-10 one of the best known of Eddystones sets.
and the EC-10A/2 marine version with 2182 tuner.
and the EB-35 geneal coverage domestic set with FM band.
and the EB-36 general hf coverage.
the EY11 as seen on another page, EC10 clone with DF, there is a valved version of this as well.
Another EC10 clone with DF facility, the Seaguide set. Seaguide badged for Marconi Marine. The Z00 identity is the MIMCO reference in the same way the Marconi Broadcast stuff was B� etc.
the Eddystone built Type 31A test set ..........
a transmitter built by Stratton, during WWII, S440, VHF Radio Telephone use.
the Eddystone 961 Panadaptor, tunes 500khz to 30 Mhz ..........
Pair of Eddystone EP14 Panoramic Display. Used to show 1Mhz wide IF o/p of various receivers.
Eddystone 2245 marine rx...............
the Bug keys
and the famous round loudspeakers
and finally, the next project. The ECR receiver, we have one complete set and one for restoration.
I am always interested in obtaining other Eddystone sets, please get in touch if you have one to dispose of. Many thanks.
Send an e-mail to: Ben Nock, G4BXD
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********* Pictures by G4BXD are G4BXD copyright ********
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