I guess with my last post, I should have included the tube information....
It's a Phillips 12VCMP4T tube. 7-pins. Any leads to inexpensive sources
for a replacement tube?
>> Hmmm, UPS just "safely let the air in (or vacuum out)" of a TRS-80 Model II
>> CRT for me by breaking the tit. Wasn't that nice of them?
>>
>> Anyone know where I can get a replacement (hopefully without spending an
>> arm and a leg)? What model(s) CRTs will work?
>My experience with _mono_ CRTs in typical computers/terminals of the
>1970's and 1980's (VGA and higher resoultions, workstations, and colour
>CRTs are a whole new ballgame) are that there are basically 2 types :
>
>Narrow neck with a 7 pin 'modifed B7G' base (like a 7-pin miniature
>valve, but with the sealing tube ('tit') in the middle) and a 12V heater
>
>Wide neck with an 8 pin B8H base and a 6.3V heater.
>
>The deflection angle on such tubes is 90 degrees. Pick one with the
>appropriate screen size (12"?) and mountings. My guess is that if you put
>in any similar CRT you'll be able to get a useable picture by jsut going
>over the normal presets on the monitor PCB. Use the yoke off the old CRT
>-- in other words keep the yoke with the electronics it goes with. Yokes
>are much less generic that CRTs.
>
>FWIW, most MDA monitors and serial terminals used the 7 pin CRTs, which may
>be a source of them. The pinout of such CRTs is :
>
>1 Control grid (G1)
>2 Cathode (k)
>3 Heater (h)
>4 Heater (h)
>5 Control grid (G1)
>6 1st Anode (A1 or G2 (*)), 'Screen' control
>7 3rd Anode (A3 or G4 (*)), 'Focus' control
>
>(*). In the UK, everything after the 1st grid is an anode. We call the
>electrodes k, g1, a1, a2, a3,...
>In the states, everything but the EHT elecrode is a grid. So you call
>them k, g1, g2, g3, g4...a .
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Received on Wed Dec 08 1999 - 11:43:27 GMT