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ETRONIC ECS2231

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Front view (closed) [15K]
  • Released September 1950
  • 16"x12" Projection.
  • Single channel Superhet
  • 21Valves
  • AC Mains Only
  • Original Cost : £147-0-0d
Front View (Open) [23K]
NOTES
Advert from March 1951
Link to larger view [177K]
Etronic's swan-song; this is their most expensive television and indeed was their only projection television. Released in late 1950, 18 months before the company went out of business, I doubt many were made, this one bearing the serial number 00183. They must have anticipated a lot more to be built as after their demise a number of surplus stores were offering the cabinets for the budding amatuer electronics enthusiast to build into a radiogram.

For a small company to produce such a projection set led me to think they used a Plessey chassis, but no, this is Etronic's on design. Component supplies must have been easier now, as unlike the mix of manufacturer's valves found in their earlier HV203 model this chassis uses all Mullard valves.

The set was pre-tuned to the rquired channel (London, Birmingham, and later Holme Moss). Although many manufacturers had made their sets tunable, this set had two RF amplifiers prior to the frequency changer which would make it difficult to make tuneable. The frequency changer is followed by two I.F. stages; in my book this makes this set 50% superhet, 50% T.R.F. ! As for the rest of the circuit, it seems fairly standard in design with perhaps the exception of the focus controls. Yes, controls ! The focus coil is simply in line with the HT circuit - standard practice - but is bridged by two focus rehostats, one "coarse" and one "fine" focus. Perhaps the current was a little unpredictable !?
SERVICE DATA The service data is available in the Retail and Electrical Trading suplement for October 1951. You ca download a copy from the Etronic page.
CURRENT STATE A few knocks and dents, but complete and electrically looks well preserved. Indeed, sometime in its past it was treated to a large number of new Tungsram valves.
WHERE FOUND An incredibly generous donation to the cause from Mikey. I'm well chuffed with it.
ADDITIONAL You can see a period advert for this set on the Etronics manufacturer's page.

Power supply chassis [13K]
[Above] The cleaned up PSU chassis, dominated on the left by the 25KV EHT generator.
Rear View [31K]
The timebase chassis, with R.F. section bolted on its side. Above this is nn aftermarket 'Cyldon' Band III tuner. Effectively there are four units, (left-to-right) the power supply chassis, the projection unit, a vertical RF chassis and finally the timebase chassis onto which the RF chassis is mounted. OK, actually there is a fifth, the addition of a Band III tuner not visible here.


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