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#11
10-02-2002, 06:59 PM
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the 7GP1 is the same as a 7GP4,used a bit earlier before the 7JP4 or 7JP1, I did not want to use the 7JP4 that the set has because it was a N.O.S tube,and want to keep the hours on the tube low,(the 7JP4 with a white phospher is neat to watch with the clock) no part of the admiral is used,just to hold the CRT in place..the little clock board is not so tiny as it is a kit from david forbes website,if you are creative you can make this board drive any electrostatic CRT,the drive board is pretty intense to build,and it only draws about 7W..!! the board will not drive the filaments on the 7gp1 high enough,so i made up a regulated 5 volt dc power supply just for the filament,still just cool to watch itself,the digits are drawn (simple so to speak) and formed from circles,lines and arcs..aligning the board is a real trip!! you can make the H/V X/Y totally out of phase and in phase to make some interesting patterns on the CRT during the "DRAW" process.
it is safe to leave alone itself running as it draws less current than a lot of bedside clock radio's draw,(all mine have been running 24hrs a day for almost 2 years).. CRT's are fun to play with..  terry Last edited by wiseguy; 10-02-2002 at 07:13 PM. 
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