Alien Poker
Williams, 1980
Black Knight
Williams, 1980
Blackout
Williams, 1980
Comet
Williams, 1985
Disco Fever
Williams, 1978
Firepower
Williams, 1980
Flash
Williams, 1979
Gorgar
Williams, 1979You're currently viewing posts by Pinsider bripin.
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Quoted from vid1900:Or, if you want to, you can replace the 8 TIP42 lamp matrix transistors (Q63, 65, 67, 69, 71,73, 75 and Q77) with IRF9Z34N MOSFETs.
I just successfully completed this mod on my Firepower. Thanks so much for the info. Is there any mod to reduce temps from the lamp row drive resistors (R95, 100 etc.) that are also screeching hot?
Quoted from MarAlb:But in this configuration the FET's are driven by a -18 Volts Vgs which is dangerously close to the absolute maximum rating of -20 Volts.
So what do you think would be the worst-case scenario with this mod in place?
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Ogden, UT