Museum of early consumer electronics and 1st achievements

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Scroll down for information about DER (Domestic Electrical Rentals).

1949. Thorn 941T Television Chassis

1949. Thorn 941T Television Chassis 1949. Thorn 941T Television Chassis

9-inch television cathode ray tube (CRT). 9" round tube 405 lines TV with 1 channel VHF band 1 tuner.
The picture tube is a Mullard 22/14C or 22/17C. Mullard had a reputation for making the best CRTs.

1949. Thorn 941T Television Chassis 1949. Thorn 941T Television Chassis

19 valves/tubes EF91 EF91 EF91 EF91 EB91 EF91 EF91 EF91 PL38 EY51 PY31 EF91 EF91 EAF42 EL42 EF91 EL42 PZ30 MW22-14C

1949. Thorn 941T Television Chassis 1949. Thorn 941T Television Chassis

This chassis did not come out of a Ferguson 941T television. It came out of a DER Model 303 television.

1949. Thorn 941T Television Chassis 1949. Thorn 941T Television Chassis

Thorn built this television for Domestic Television Rentals. DER. Unlike the Ferguson, the speaker was below the chassis.

1949. Thorn 941T Television Chassis 1949. Thorn 941T Television Chassis

DER Television Model 303. Serial number 1320. Built for DER. Wooden case. Band 1 tuner for Alexandra Palace transmissions.

1949. Thorn 941T Television Chassis

The chassis has now been re-installed in the DER Model 303 television shown below.
See more pictures and details of the DER Model 303 television.

1949 DER Model 303 9 inch TV 1949 DER Model 303 9 inch TV

About DER (Domestic Electrical Rentals).

DER Advert

DER or Domestic Electrical Rentals was a TV and Radio rental company set up by "Thorn Electrical Industries Ltd" in 1939.
Radios and the early television receivers were rented throughout the Greater London area. The TV transmissions came
from the "Alexandra Palace" transmitter in London. They used a 405 line scanning system and the early sets like this
Model 303 had a single channel VHF band tuner for the reception of the BBC. The DER head office was in Apex House,
Twickenham Road, Feltham, in Greater London (9 miles from the centre of London). "Apex Corner" was named after Apex
House which was demolished. Thorn was the manufacturer, Ferguson was the retail brand name and DER was the rental
company. DER had only 1 shop from 1939 to 1947. By 1954 it had 10 branches. It would be a fair assumption that it
had between 1 and 3 outlets in 1949 at the time this DER Model 303 TV in our museum was offered to customers.
By 1968 there were almost 400 shops. In the 1980s it was clear the rental market was declining, mainly due to the
reliability of new sets. Curiously DER did not stock Ferguson TVs for rental. They used the DER brand name and
their own model numbers. Indeed the TVs were not even exact Ferguson clones. They had the same Thorn chassis
inside but the cabinet was designed for DER and many looked quite different. For example, the 1949 Model 303
in the museum and shown above had the speaker located below the chassis rather than on the left hand side on the
Ferguson 941T. The Ferguson can be seen on the "Radio Museum" web site. It is interesting that the picture of the
Ferguson on the "Science & Society" website shows the speaker on the wrong side. The picture has been incorrectly
laterally inverted. It was common for people to rent TVs in those early days due to the cost of servicing, the cost
of parts, especially the high cost of the CRT (Cathode Ray Tube or picture tube) and the fact that early sets were
not very reliable. DER had their own servicing department and eventually a fleet of vans for house repair calls.
Servicing, labour and parts were all covered by the weekly rental charges. After a while the set could be
upgraded to a later improved model. The price of post war TVs could be equivalent to 4 weeks wages and so
renting a set was a good option for many people. By the mid 1970s sets were cheaper but rental prices
were also low. In 1975 a DER 17-inch compact TV had a weekly rental of about £1.20 per week
and a luxury 26-inch TV about £2.00 per week all inclusive of servicing.
In the picture below, on the shop door you can see a price of "25 shillings" which is £1.25

DER Advert

The picture above of a DER (1967/68 Mk1 Ford Escort) van in front of a DER shop has been included with the kind permission
of the Admin/Founder of "Radios-TV". The picture is from a 1975 DER colour TV brochure. You can click on the
picture above or click here to go to the "Radios-TV" web site and see the complete DER brochure from 1975.
In addition, you will also find rental prices, more information, pictures about DER and a DER service engineers tool kit.

The Rewind Museum

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The 1952 Chevy truck

The 1952 The 1952 Chevy truck web site.

Link to our main site. Satellite TV.

Rewind Museum is sponsored by Vision International. Note. One of our businesses, Vision International (established 1991)
sponsors Rewind Museum and Satellite Museum including financial support for this web site. Vision International
is one of a group of businesses which we have in the field of Satellite TV.

Vu plus satellite receivers 60cm Clear dish

Tune in an extra 10,000 channels? Watch the world? Links to some of the Satellite Superstore pages are below,

Sky Receivers Freesat Receivers All satellite receivers Fixed Dishes Transparent Dishes Motorised systems LNBs
Multiswitches Caravan satellite Satellite finder meters Installation equipment. Catalogue of all satellite products.

Rewind Museum web site is maintained on a non-profit making voluntary basis.
Our main business website is at
Our main business is satellite TV and we are a specialist satellite company. We
supply satellite goods in the UK and worldwide including fixed and motorised satellite
systems, multiswitches, instrumentation, accessories and installation equipment.

Return to our website introduction page. Read about the aims of our museum.

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For all questions & comments about this site's content contact Dave at Rewind Museum.