Eddystone_post-war_models.pdf

《Eddystone_post-war_models.pdf》由会员分享，可在线阅读，更多相关《Eddystone_post-war_models.pdf（35页珍藏版）》请在收音机爱好者资料库上搜索。

1、 POST- WAR MODELS irst of all a word about prices. In 1940 the British government introduced a new indirect tax to help pay for the War. It was called Purchase Tax and was levied on the trade price of items deemed to be consumer goods, not clothes, food, or Eddystone components. The actual rate was

2、determined by the Chancellor of the Exchequer and varied according to the needs of the economy. After the war it was continued until 1973, and was used as an economic regulator which varied according to the luxury rating of the goods. In 1946 Strattons claimed that their Eddystone receivers were not

3、 consumer goods. The Revenue authorities begged to differ and rated them as domestic receivers. Strattons then claimed that communication receivers were not domestic receivers and left out the loudspeakers (which their first post-war cabinet had been designed to take). The tax-man ignored them. Afte

4、r two years of debate the Revenue finally gave in, but determined that the criterion would be the presence or absence of a BFO! The tax varied between 30% and 60% of trade price until VAT replaced PT (which started at 8% of retail price across the board, but is currently 17.5%). Secondly, a word abo

5、ut nomenclature. At some time in the very late thirties all Strattons radio products were given an S number. This stood for Specification (not Stratton, as has been suggested). The actual sequence of these numbers is very erratic. In general terms the numbers get greater with the passage of time, bu

6、t not always so. The allocation of these numbers is usually credited to Harold Cox, who by this time was the Technical Director of the Eddystone Radio section of Strattons, which, it must always be remembered, manufactured more powder compacts and fancy goods than radios! In the early 1960s a new sy

7、stem of numbering started, to run in parallel with this traditional nomenclature. It was the two-letter prefix of which the first was always E (for Eddystone) and the second was a type designator, viz: EA Amateur EB Broadcast EC Communication EM Marine EP Panadaptor (not strictly a receiver) EY Yach

8、tsman In the late thirties a traditional dating system was incorporated into the serial numbers of Eddystone receivers. Starting from 1923, it was a simple letter per year which repeated every 26 years plus a letter per month which utilised the first twelve letters of the alphabet. The earliest sets

9、 extant, c.1926-7, to wit four Eddystone Twins and three Atlantic Twos, have no serials whatever, so I think this starting date of 1923 is wishful thinking. Serials of the 1930s dont fit this rule until 1939. In theory there was a special order to this code; up to 1948 the month came first and from

10、1949 the year came first. This was fine, but in practice it seems the job of punching out the serial plates was given to the newest apprentice who was never quite sure which way round he should be doing it and didnt like to ask! So there seem to be as many errors as correct codes. But with a bit of

11、luck, using the date spread of production given within as a guide, you will probably be able to get the right answer. The exceptions seem to be these of the Type EC models (above), most of which have the prefix omitted. F 2 Other exceptions to the rule are the prefixes DD and PP, which refer to the

12、set being a development or pre- production model. The serial will always be very low (like PP0002). These sets were not sold but raffled off to employees. They may or may not be something like the final product! But they do turn up. Dating Code for Eddystones (see text) A 1923 A 1949 A Jan B 1924 B

13、1950 B Feb C 1925 C 1951 C Mar D 1926 D 1952 D Apr E 1927 E 1953 E May F 1928 F 1954 F Jun G 1929 G 1955 G July H 1930 H 1956 H Aug I 1931 I 1957 I Sept J 1932 J 1958 J Oct K 1933 K 1959 K Nov L 1934 L 1960 L Dec M 1935 M 1961 N 1936 N 1962 O 1937 O 1963 P 1938 P 1964 Q 1939 Q 1965 R 1940 R 1966 S 1

14、941 S 1967 T 1942 T 1968 U 1943 U 1969 V 1944 V 1970 W 1945 W 1971 X 1946 X 1972 Y 1947 Y 1973 Z 1948 Z 1974 Type S.556 / S.556B 1946 EDDYSTONE TYPE S.556: 1946, First post-war model. De-luxe tea-planters broadcast receiver. AC mains. 10 octal valves; 2 RF; 2 IF (450 kc/s); magic eye tuning, 75 inpu

15、t. Twin built-in 3” speakers. 580kc/s - 30.5mc/s Price 37 (plus purchase tax in UK) Rare S.556B: As above but with internal 6 volt vibro-pack in place of the AC psu. (It is wrongly called the model 566 in the 556 handbook). It was intended for use with a 6-volt accumulator and petrol generator for c

16、harging. Very rare. Type S.504 1946 EDDYSTONE TYPE S.504: 1946. First post-war communication receiver, based on S.556 but without speakers and with S-meter, BFO. Dual-gate Xtal filter, Noise limiter. 75 ohm input. Same coil-box and frequency coverage as S.556, AC mains. Rare. NOTE: Most Eddystone ha

17、lf-moon dial sets have provision for a 400 balanced feeder or end-fed aerial. In 3 the case of using the latter, a special shorting link must be in place Type S659 / 659B EDDYSTONE TYPE S.659: 1947-8. Tea planters set. 8 octal valves; AC mains, 1 RF; 1 IF (450kc/s) 4 bands, 520kc/s- 30mc/s; magic ey

18、e, noise limiter (switch at rear); built-in speaker but offered with huge baffle speaker. Very rare. S.659B: as S.659 but with built-in 6-volt vibropack instead of AC. Very rare. NOTA BENE: TUNING DIALS MADE FOR THE S.659 WERE LATER USED FOR THE MUCH MORE COMMON TYPE S.670. THIS OFTEN LEADS TO CONFU

19、SION. SEE UNDER S.670. EDDYSTONE TYPE S.640: 1947. HF communications receiver; 1.7 31mc/s; 9 octal valves; electrical bandspread. AC mains; 1 RF; 2 IF (1,600kc/s); BFO, xtal filter, 4,000 manufactured from 1947-1949. Price started at 42 (plus UK PT) then dropped to 27 10s (became tax-exempt in 1948,

20、 as did all sets with a BFO). Optional separate speaker and S-meter. Aimed at the radio-amateur/SWL market. Common. Type S.640 1947 EDDYSTONE TYPE S.680: A famous communication receiver which had a false start. The model (below) was exhibited at the 1947 Radiolympia Show and hailed as the successor

21、to the S.504 (ibid.), using the latest range of miniature valves. Prototype Model S.680 1947 Unfortunately it ran a little too warm (it was using the cabinet and mains transformer of the 640, which itself only just managed to keep cool enough). So it went back to the drawing board for a couple of ye

22、ars and re-appeared in 1949 as the New 680. This has caused a little confusion as factory references called this the 680/2, but it was never marketed as such. EDDYSTONE S.680 (aka S.680/2): 1949-1951. Noticeable differences from the previous photo show a deeper 4 cabinet and cooling louvres, togethe

23、r with phone jack at LHS of case. Strattons most serious post-war product yet. New Type S.680 (aka S.680/2) 15 valves (all miniatures except PSU). AC mains; 30mc/s to 480kc/s. Two RF, two IF (450kc/s), BFO, Xtal filter, push- pull output, variable selectivity, external speaker (option), noise limite

24、r, S-meter. Available for rack mounting. Auxiliary bandspread dial gives 7 ft. 6 ins. per range. Price 85. Rare. S.680/2A: special model for NZBC with different connectors at rear. Type S.680X 1951-61 EDDYSTONE TYPE S.680X: a direct successor to the Type 680/2 (above). Commonly incorrectly reported

25、as being a Xtal filter version of the Type S.680 (almost certainly inspired by the S.358/S.358X, where it IS the difference but both S.680 This was the first of a very successful series of broadcast receivers targeted at ships officers and first-class passengers; they became known as cabin sets. In

26、fact, the first batches were reserved for Export Only (in common with many other luxury goods) at this time of post- war shortage of hard currency. (See also S.670A and S.670C). Strattons north-eastern agent, Alf Willings of West Hartlepool had suggested that such a market existed. Most ships power

27、supplies were 110v DC and the only sets available for such voltages were American midgets. These had no hash filter in the power lead nor did they have arrangements for a low-interference aerial. There would be a market for a decent general coverage set, he said, and there was. 7 miniature B8A valve

28、s + metal rectifier; AC/DC mains 110-250v. 1 RF; 1 IF (450kc/s) Push-pull output, built-in 6” speaker. 4 bands, 520kc/s-30mc/s. 1948-54. Price 37 10s. (plus P. Tax if sold inland) Common. NOTA BENE: Most S.670 sets were built using calibrated dial glasses originally made for the rare model S.659 and

29、 were so labelled. To compound the confusion the top left of the dial back-plate carried the legend MARINE RECEIVER 659/670 in the same place that the S.659 had a magic eye. Beware! 5 EDDYSTONE TYPE S.670A (1954-62), direct successor to the marine cabin receiver type 670 (above) but with several cha

30、nges. New slide-rule cabinet. 6 valves plus metal rectifier. Single-ended output stage. Magic eye tuning indicator. 110-250 volts AC/DC. 1 R.F., 1 I.F. (450kc/s) Four bands: 150- 380kc/s; 540-1500kc/s; 5.8-30mc/s. It is also listed in company records as the Type S.883. I can find no reason for this

31、so far! Also it is believed that the TYPE 881/1/2/3 cabin tuner was a version of this set; 750 produced. Eddystone Type S.670A 3,275 models were produced. It is remarkably rare for such a production run. Price 49. NB: versions of this model exist under the Marconi (MIMCO 2232A) badge. This may inclu

32、de some of the above production. Most examples are likely to have ended up in the ship- breakers yards. EDDYSTONE TYPE 670C The final version of this successful line of marine cabin sets. Slight circuit alterations but otherwise very similar to the 670A (above). Eddystone Type 670C The main differen

33、ces were the new-style cabinet, a built-in brute-force mains filter and two extra wavebands, now covering 150-350kc/s and 500kc/s 30mc/s. 1962-64. 400-plus manufactured. Rare Eddystone 670C/1, as above but badged as Marconi Elettra alias MIMCO 2232B 400 known to have been manufactured 1963-67. Very

34、rare. Eddystone S.670C/1 Badged as Marconi Elettra Other versions of the 670A 1 RF; 1 IF (450kc/s); 4 bands 480kc/s - 30.6mc/s; internal 6” speaker, 1949. Price 39. Production run: 270 models. Very rare. NOTA BENE:- Some of these models also used dial glasses from the S.659, but had the name All Wor

35、ld Six in the top left corner. Eddystone Type S.710/1 EDDYSTONE TYPE S.710/1 S.791 Combination for Communal Listening This was a standard Type S.710 fitted with a special output transformer and supplied with a Voigt pressure drive speaker. Speaker length 54”, dia 24”, weight 16 lbs. This was suitabl

36、e for a large number of people grouped indoors or out to hear broadcasts from distant or local stations. It was an export special and it is doubtful if any survive. Price of S.710/1, 49 10s. Pressure drive speaker S.791 16 18s. Six volt accumulator, 102 ampere hour, 40 hours listening time; (price o

37、n application!) Type S.720 Yachtsman (1950) EDDYSTONE TYPE S.720 Yachtsman designed for use on cabin cruisers and yachts.7valves; 1 RF, 1 IF (127kc/s), BFO, built-in speaker, internal 12v vibropack option for 24 volt adaptor. 3 bands. Coverage 80-620 metres (3750-480kc/s) and 900-2,300 metres (130-3

38、30kc/s). Special attention devoted to the reception of Consol navigational signal with maximum intelligibility. Price started at 48 6s 8d then fell to 43 10s. Production run 100 models. Very rare. Type S.740 (1950-1954) EDDYSTONE TYPE S.740: General coverage communications receiver AC Mains 110-250v

39、. 8 valves; 1 RF, 1 IF (450kc/s), BFO, external speaker, provision for plug-in S-meter; (both optional; see page 55 et seq.). 4 bands: 30.6mc/s to 1.4mc/s and 205 Metres to 620 Metres. Production run, 900 sets. Price 32 10s. Rare. 7 Type S.750 1950-58 EDDYSTONE TYPE 750: Strattons first true double

40、conversion communication receiver and also the companys first slide-rule set which gave a linear logging-scale of 32 ft. Using 11 valves it had 1 R.F. stage, a tuneable converter to the first I.F. of 1620kc/s, straight into a fixed frequency changer with a second I.F. of 85kc/s and variable selectiv

41、iy, followed by BFO, N/L and O/P stage. AC mains. 32 1.7mc/s and 1465- 480kc/s. Introduced at 49 10s. it reached 75 by the time it ceased. Prod run 2054. Quite rare (considering its production run). TYPE 750/1 As 750 but for 110v 25 only. Prod run 79, c.1955. TYPE 750/2 as 750 badged for Marconi as

42、HR100, for use in coastal stations. Manufactured in two versions (diff- erence not known), Edition A, 105 produced; Edition B, 545 produced. Type S.840 1953-4 EDDYSTONE TYPE S.840: Economy communications receiver suggested by Strattons agent in the British Dependency of Aden on the Persian Gulf. The

43、y 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

44、 110-250v (work anywhere!) 4 bands, 480kc/s-30mc/s. 45. 501 manufactured. Rare. (Bill Cooke, GION, Chief Engineer at Eddystone throughout the period of these simpler valve sets, once told me that they were the companys bread and butter. If it werent for the 670-series and 840-series they would have

45、been stuck for work between big specialist orders.) Type S.840A 1954-61 EDDYSTONE TYPE S.840A Successor the 840 (above), built into the new type slide-rule case with 32 feet of logging scale. Exactly the same circuit and specification. Price 49. 2,000 manufactured. Quite rare (considering its produc

46、tion run.) Type S.840C 1961-68 EDDYSTONE TYPE S.840C Successor to the 840A (above) built into the new- 8 60s style cabinet. Virtually the same circuit but with the addition of a magic eye tuning indicator and linear scale device. This involved extra padding capacitors (among other things) and it was

47、 necessary to have five bands to cover the same waverange. 1961-68 Price 58 increasing to 68. 3,500 known to have been manufactured by 1965. Common. EDDYSTONE TYPE S.730 Series: A large family of professional communication receivers, based on the 680X. 15 valves; 2 R.F.; 2 I.F. (450kc/s), BFO, IF ca

48、thode follower output, variable I.F. selectivity, xtal filter, xtal calibrator, adjustable scale, noise limiter, S-meter, audio filter (for CW), fully tropicalised. Started with 730 in 1953 (prototype only made); followed by a run of 25 730/1. Then the 730/1a (1954-8; production runs of 317) for the Diplomatic Wireless Service (some of which could be dismantled for the diplomatic bag). 730/2 in 1955 (Strattons version of /1a 40 built). 730/3 in 1956 (Strattons version with switched xtal channels). Type S.730/4 with