CBBS(R) 4.0.3b 07/07/91 21:15:15 Y/N: want CBBS "1st time user" info?^U ?^U ?^U ?n;ward;christensen;odraw;;fullc;piss Logging name to disk... You are caller 222486; next msg =44959; 379 active msgs. Prev. call 07/06/91 @ 23:25, next msg was 44954 Recording logon for next time... Use FULL? to check assignments ?^U ?xxxxx "Mine" command checking for msgs TO you, >Function:?dir c:log;dir c:killed;dir summary;type-20 log,ward c;or;*;short LOG. 8 KILLED. 15 SUMMARY. 25 07/05/91,22:52:06,222447,2,WARD CHRISTENSEN,, E#44949,3 07/05/91,22:58:14,222448,2,JOHN SERRANO,,1 47,222463,2,WARD CHRISTENSEN,, E#44954,3 07/07/91,00:11:51,222464,9,TONY ANTONUCCI,,5 07/07/91,01:08:43,222465,2,BILL MATTSON,,1 07/07/91,01:43:53,222466,9,ERIC BOHLMAN,, E#44955,6 07/07/91,05:50:25,222467,2,BILL WOLFF,,1 07/07/91,09:18:02,222468,2,MARTY DIPPEL,,17 07/07/91,09:44:46,222469,9,BEN TEIFELD,,1 07/07/91,09:55:59,222470,2,MARTY DIPPEL,,33 07/07/91,14:14:03,222471,3,BORIS KUKSO,Chicago/ IL,21 07/07/91,14:46:25,222472,2,JOHN SERRANO,,1 07/07/91,15:13:45,222473,2,BILL WOLFF,,1 07/07/91,16:23:01,222474,2,CHRIS KING,CHGO/ IL,7 07/07/91,16:28:42,222475,2,JERRY HASLETT,, >Help: G] !"(,Y>Y2[WYGVB.SY, 07/07/91,16:52:44,222476,3,MURRAY ARNOW,, E#44956,29 07/07/91,17:23:14,222477,2,DONNIE STUHLMAN,,3 07/07/91,17:33:06,222478,2,BILL WOLFF,, E#44957,3 07/07/91,17:46:35,222479,1,BOB CLARK,Chicago,16 07/07/91,18:04:13,222480,1,BOB CLARK,,7 07/07/91,18:22:28,222481,1,DAVID JOHNSON,,4 07/07/91,18:50:17,222482,1,DAVID JOHNSON,,6 07/07/91,20:04:03,222483,1,ERIC LEFEBER,Chicago IL,6 07/07/91,20:39:27,222484,1,RICHARD GOZDAL,,7 07/07/91,21:07:47,222485,2,BILL WOLFF,, E#44958,2 07/07/91,21:15:19,222486,2,WARD CHRISTENSEN,, 44954 07/06/91 WARD CHRISTENSEN => JERRY OLSEN: "R/INTNL. SHAREWARE SOURCES" 44955 07/07/91 ERIC BOHLMAN => BILL WOLFF: "R/REFERENCE BOOK" 44956 07/07/91 MURRAY ARNOW => BILL WOLFF: "R/CRT LIFETIMES" 44957 07/07/91 BILL WOLFF => ERIC BOHLMAN: "R/REFERENCE BOOK" 44958 07/07/91 BILL WOLFF => MURRAY ARNOW: "R/CRT LIFETIMES" ---- End of summary ---- Retrieving flagged msgs: C skips, K aborts. Msg 44954 is 02 line(s) on 07/06/91 from WARD CHRISTENSEN to JERRY OLSEN re: R/INTNL. SHAREWARE SOURCES Are you on Compuserve? There is a forum called "IBMEUR" (Europe) which could give you a good start! Msg 44955 is 03 line(s) on 07/07/91 from ERIC BOHLMAN to BILL WOLFF re: R/REFERENCE BOOK There's a second edition of Horowitz and Hill, dated 1989. Among other things, they completely rewrote the chapter on FETs. Definitely worth the money. Msg 44956 is 21 line(s) on 07/07/91 from MURRAY ARNOW to BILL WOLFF re: R/CRT LIFETIMES I'll quickly answer your questions. If you want more detail look at the Handbook of Materials and Techniques for Vacuum Devices by Walter Kohl (Reinhold, 1967) andColor Television Picture Tubes by Albert Morrell, et. al., (Academic Press,1974). I beleive both books are out of print, but your library may have copies. This is a very mature industry and new books aren't in demand. Now, the getter is always functioning until it gets exhausted, which may or may not happen during the life of a tube. The better the tube is processed the less outgassing and getters last forever. The tube needs not to be operating for barium getters to function. A barium getter operates this way. A device holding a barium suspension in an aluminum matrix is welded to the gun. The device often called the getter is heated after the tube has been pumped and sealed. The barium is vaporized during the heating and is deposited on the inside of the tube, usually on the envelope and mask. Barium is an active metal and combines with the residual gases in the tube to form barium compounds The barium coating the mask is going to be exposed to electron beam bombardment. The x-rays usually are created here. The coating on the funnel is not at ground it is at the screen voltage. It is there to form a field free region so the electron beam isn't defelected by electrostatic forces. By the way I've been involved in electronics design for about 20 years, ranging from tubes to chips, voltages from 150KV down to nanovolts. Thanks, for your references. If I get a chance I'll look at it. Msg 44957 is 03 line(s) on 07/07/91 from BILL WOLFF to ERIC BOHLMAN re: R/REFERENCE BOOK Hi Eric! I should have known that you would have one one those reference books and a 1989 edition at that. You can be sure that I'll be checking out the newer version. Where did you get yours at? Msg 44958 is 21 line(s) on 07/07/91 from BILL WOLFF to MURRAY ARNOW re: R/CRT LIFETIMES Thanks again Murray! The knowledge you shared sure illustrated a great deal. I must say there is a big distinction between high vacuum systems and vacuum tubes. The system I used to work on had to be reopened to air from time to time. The getter system used in CRT's just couldn't handle this mistreatment. Yet on the other hand, if we had a getter that always performed, that sounds really convenient. If you didn't know, electron microscopes go up to 1 million volts. Many of the ones I was close to, created 120KV to 400KV. Some used oil as an insulator and some used SF6 gas. Some of the circuits that I had to check, required to be within one millionth of a volt. Tightfisted specifications huh? It had to be, as the error would then would be magnified one million times. It was tough finding a differential voltmeter. I even had to make my own to get by. Maybe that is why they only hired engineers. It was also my job to interface electron microscopes to computers with imaging packages. Not fun when you were the first one doing them. I've learned they are still doing them just the way I had designed the first few. That is good, but there were some things I would have liked to have done differently if I had the time. Was it that way with you as well? By the way, thank you for the references. I am very likely to check them out. No dup. chars. >Function:?