Emerson Radio 'American five family' 1939 to 1942
Emerson Radio 'American five family' 1939 to 1942
According a description in "Radio Marketing Service Engineer", February 1944, Emerson built the following models with the same tube line up of 12SA7, 12SK7, 12SQ7, 50L6 and 35Z5:
301 (with DB-301, DB1-301, EC-301 and EC1-301 - prefix telling the chassis).
The DB and DB1 chassis show a 12K7 and not the single ended 12SK7. See also pictures by Armand Verboven on DB-301 - including original wiring.
330 (with DL-330, DL1-330, DW-330A, DW-330B, FG-330)
Also here we see that the chassis employ a 12K7 with top cap as also shows the schematic - eccept the FG chassis.
331 (with DM-331 and DM1-331)
We see here that this chassis shows 3 knobs and the Pentagrid-Converter is the 6A8(GT), no single ended tubes.
332 (with DP-332 and DP1-332)
Also for 6K8GT, 6K7GT, but 6SQ7GT, 6AE5GT, 25AC5GT and 25Z6 (L42B) - no "American five".
351 (with the very nice looking DQ-351 Humpback Bullseye, DY-351, DY1-351)
353 (with EC-353 and EC1-353)
376 (with the EC-376 with a very nice cabinet and two loudspeakers - and the 12K7GT)
400 (with the 400 Patriot (1, 2, 3) and 400 Aristocrat. They all have a round propeller scale).
Unfortunately up to now no member has cared for putting in the tubes or adding a schematic.
421 (with FP-421 - but with 4 knobs and a slide rule dial on top).
422 (with FP-422 - like the 421 but bigger wooden cabinet).
425 (with ??-425 and EC-425 - both with 12K7GT).
461 (we show only 461, no prefix for a chassis, no tubes yet.)
Thes speciality here is the cardboard cabinet.
463 = we miss the model page yet for an Emerson model 463.
The article shows only two different chassis layouts, one for 301 and 425 - plus 376 with twin speakers. one for models 421 and 422. We learn that there is a special resistance line cord available for 230 volt AC or DC mains. I did not find something about the other tube types involved - but information for different coupling for 12SA7 and 12SQ7. There is the basic circuit for the series 301 and values of the resistances and condensers. Loop antenna for single waveband 540-1600 kc (555-187.5 m) for operation on 105-125 volt AC-DC.
The page mentions similar models Admiral 67M5, 4220-D5, Andrea 35H5, Fada 115, 148, 200, 203, 205, 209 and 220, GE J-54W, L513, L570 and L574, Motorola 51 - 16 and 51 x 19, RCA 1x, 6x2,14x, 34x, 35x, 45x12 and 55x plus Westinghouse 12x4 and 13x8.
I can imagine that we have not yet created all subversions of such Emerson models. Suggestions are welcome!
But on top of this list we feature at least the models ??-418, also a Humpback Bullseye, EL-361 for this kind of family with above tube line up (no photo yet) and many others, mostly with an integrated record player - like the CV-290 - or having a handle like the CV-280.
Members can use the "fully detailed model search" and will find 198 different models - when entering the brand Emerson and year 1939 to 1944 plus number of tubes = 5.
See also the Emerson AX-212 Bullseye from 1938/39 as a predesissor of the Humpback Bullseye - with the classic tube lay out of 6A8, 6K7, 6Q7, 25L6 and 25Z5.
We learn from Tom Albrecht: "Although the 12K7 tube is not particularly common, 6K7 was very common. Five tube sets with series heaters really only became common when octal tubes were introduced, and this became the All American Five. Earlier five tube sets were more likely to use a power transformer and all 6-volt heaters. For example 6A8, 6K7, 6Q7, 6K6, and 6X5 or 5Y3 rectifier. These tubes became the octal types 12SA7, 12SK7, 12SQ7, 50L6, and 35Z5 (half wave rectifier; not really equivalent to the earlier full-wave rectifiers) for the AA5."
We know that there was no metal tube 12K7 (but a 6K7) but often the 12K7 is mentioned when a 12K7GT or 12K7G is involved - and therefore we show a tube page 12K7.
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