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PHILIPS G20T322-01 |
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NOTES |
![]() This set is amongst the first to use varicap tuning, a system referred to as "Electrobutton" tuning by Philips. Tuning is accomplished by varying the voltage across a reverse biased diode, which causes the capacitance of the diode to change. Now that tuning is accomplished via the application of a voltage, other circuitry can monitor the accuracy of the tuning and thus apply correction to avoid drift. |
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SERVICE DATA | Only a supplement to the manufacturer's provisional service data which is dated September 1972. | ||||||
CURRENT STATE | ![]() The on/off switch was the first real puzzle - until I worked out you pulled it to switch it on (D'oh!). The bigger puzzle was how to tune the set ; it clearly used varicap tuning so somewhere there had to be a pile of pots behind the front panel. It was some time before it sunk in that the button assembly rotates downwards - it was just a bit stiff. ![]() |
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WHERE FOUND |
Wotton Bassett auction, December 2005, for £2. |
Squeaky clean interior. This set has seen little use.
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"Warning : This set is fitted with big girl's blouses (aka transistors)" |
EHT rectifier pretending to be a valve by wearing a top cap. |
All images copyright © J.Evans 2005 |
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Last updated 4th December 2005 |