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ETRONIC HV203

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  • Released August 1949
  • 10-inch Cossor 108K C.R.T.
  • Single channel T.R.F.
  • 15 Valves
  • AC Mains Only
  • Original Cost : £66-3s-0d
Front View [35K]
NOTES
Model and serial number [8K]Etronic were a small outfit that didn't enter the television field until late 1948. The HV203 was only their second model and in total they only produced a handful of models before going out of buisness at the start of 1952. Indeed I wonder how many sets they made, as this one is serial number 435.

The HV203 was launched on the eve of the start of transmissions from Birmingham and was available for either London or Birmingham. However it is still a T.R.F. design. Even more backwards is the fact that although the set has EHT derived from the line output stage there is no boost diode which by this time was almost universally fitted by other manufacturers.

Hidden controls [8K]Although there are only two controls visible on the front, a little door just below the screen hides a further four "occasional" controls (line and frame hold, contrast and at the time the all important interference limiter).

A larger screen version, the HV204 was also produced using a 12" M*zd* C.R.T. In order to be able to use the same cabinet as the smaller screen model Etronic adopted a similar method to that used by Peto Scott (see their TV92) where the screen surround was made using a seperate wooden section that could be replaced to suit the CRT. Except ... Etronic also briefly produced a model HV209B using a smaller 9" CRT. Instead of fitting a different wooden section, silk screen print was applied to the glass to cover up the space ! My guess is the HV209B was introduced due to shortages of the 10" Cossor Focus unit made by Elac [6K]CRT's as this small manufacturer probably had to use whatever parts they could get. This is also apparent from the valve line-up, an odd mixture of Mullard, Brimar and Cossor valves. You also you don't often see the manufacturer's labels on assemblies such as the Elac focus unit (I'm sure I've seen an Elac advert aimed at the home constructor somewhere ... ?).
SERVICE DATA Not exactly. However there is a lot of similarity to the later superhet model ECV1523 for which a test report can be downloaded from the Etronics manufacturer's page.
CURRENT STATE
Externally above average, internally pretty clean, though the set has been fitted with a huge Band III convertor manufactured by Channel which has required a huge chunk to be cut out of the back. Talking of the back, seems to have been a bit of a technical c**k-up in the design department as there seems to be quite a gap top and bottom, to say nothing of the fact that it seems they also forgot the cutout for access to the rear controls. Oops!! Rear cover and "Channel" convertor. [7K] OK, who forgot the cutout !? [8K]
Engraved plate attached to teh front of the set [9K] This example has an engraved plate attached to the front of the set which reads "Presented to J.H.Beavan by the Members of The BARROW and DISTRICT MASTER BAKERS ASSOCIATION in recognition of his services".
WHERE FOUND Via Fleabuy for £227.50. Yes, a world first, something described on Fleabuy as "Rare" when it is indeed rare !
ADDITIONAL You can see a period advert for this set on the Etronics manufacturer's page.
Chassis view [42K] [Right]Well, LOP stages don't come much simpler looking than this ! Two valves, a tranny, some bodged-in resistors and a horid Visconal capacitor. Oh, and a manually adjustable electro-dynamic linearity compensator (thats the red bit of bent wire poked in the 'ole, bottom right).

The rest of the chassis view is also somewhat sparse above deck. But none-the-less not well designed ; like most consoles of the time the chassis rests on a wooden shelf. So far so good. But it seems Etronic forgot to put a hole in the shelf, so not only will there be no air circulation underneath to keep things cool, the poor service engineer needs to remove the entire chassis should any component other than a valve need replacing.

Note the novel placement of the mains transformer. Logical really, since there isn't many places it could go without it's magnetic field interfering with the scanning coils. You can understand why most manufacturers had designed-out this component.

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