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Old 30th Mar 2020, 5:53 pm   #5
FERNSEH
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Join Date: Mar 2005
Location: Gateshead, Tyne and Wear, UK.
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Default Re: The Ever-Ready experimental transistor TV set.

Hi Nick,
The CRT is a special Mazda development type V3271. It has a full square flat faceplate, 7" diagonal, P4 phosphor. There is no line output transformer, the 2N1046 line output transistor drives the scanning coils direct. Drive to the PNP transistor is by a broad negative going pulse and the sawtooth drive is generated in the high inductance scan coils, just as it would be in the primary of a line output transformer. The transistor is turned off during the flyback. A Mullard OA5 serves as the damper diode.

Worth noting the Pye TT1 draws less than 2amps from the internal battery pack. The CRT has 6.3V 0.3amp heater.

DFWB.
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