1975 MultiBroadcast 7773

Thorn 9000 Chassis

Model: Multibroadcast 7773

Year:1975

System:625 Line

Valves: None

Transistors:Yes

Integrated Circuits: Yes

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In 1975 Thorn once again startled the TV industry with the introduction of the 9000 series chassis with its Syclops combined chopper regulator/line output stage.

The 9000 used a parallel switched-mode power supply running synchronously with line. A conventional transistor line output stage except that it uses the power supply switching transistor to conduct the latter portion of scan with an efficiency diode conducting the first part. This was known as SYCLOPS (SYnchronous Converter and Line OutPut Stage)

Here we have a 20″ Thorn Television Rentals Model 773 badged for the Multi-broadcast chain. Ultrasonic remote control (sequential channel change & sound mute only)Nice touch is the nixie tube channel indication.

This one came from the same storage source as the Ferguson 3713 and therefore the electronics have suffered with the same humidity/rust issues.

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1975 MultiBroadcast 7773 1

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graham
graham
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2 months ago

Hi, i used to buy these from central tv on the ely estate in enfield ,We had a tv and video shop on victoria road romford essex,in the end i used to buy the whole lorry load,great times and lots of money made i used to pay around £3 each for them working or not,some had flat tubes but i had an american cathode cleaning machine ,just plugged it on the back of the tube then pressed the red green and blue buttons and you could see all the crud sparking and falling off the cathodes,most came up like new,i used to buy teletext tx 10s the same way as well.

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