All the little macs have compatible CRT tubes, mix and match all you want. If the socket fits, use it. ;)

> 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 .

However, 7 pin CRTs are _common_. Just about every 12" mono monitor (MDA, or TV rate) or old video terminal (VTxxx) will contain one. If you can get a few such monitors for not much money, it's worth trying the CRTs in your model 2. Most likely it'll give a picture.

-tony