freudent@lab.ultra.nyu.edu (Eric Freudenthal) (06/06/91)
I have recently acquired a motorola 17T4 (old TV in machine-age case) with a 17AP4 or 17BP4 crt. The acceleration voltage is 12KV. To my surprise, this set has minimal shielding around the rectifier tube, which raises the question in my mind whether the set pre-dates x-ray shielding. (I have heard that very early TVs were hazards). I replaced the rectifier with a diode, but am wondering if I should also shield the CRT. There is a glass faceplate in front of the tube. -- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Eric Freudenthal NYU Ultracompter Lab 715 Broadway, 10th floor New York, NY 10003 Phone:(212) 998-3345 work (718) 789-4486 home Email:freudent@ultra.nyu.edu
freudent@lab.ultra.nyu.edu (Eric Freudenthal) (06/06/91)
I have recently acquired a motorola 17T4 (old TV in machine-age case) with a 17AP4 or 17BP4 crt. The acceleration voltage is 12KV. To my surprise, this set has minimal shielding around the rectifier tube, which raises the question in my mind whether the set pre-dates x-ray shielding. (I have heard that very early TVs were hazards). I replaced the rectifier with a diode, but am wondering if I should also shield the CRT. There is a glass faceplate in front of the tube. Thank you. Please reply by mail. ....Eric -- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Eric Freudenthal NYU Ultracompter Lab 715 Broadway, 10th floor New York, NY 10003 Phone:(212) 998-3345 work (718) 789-4486 home Email:freudent@ultra.nyu.edu
rcarter@wpi.WPI.EDU (Randolph Carter) (06/06/91)
The ghost of freudent@lab.ultra.nyu.edu (Eric Freudenthal) writes: >I have recently acquired a motorola 17T4 (old TV in machine-age case) >with a 17AP4 or 17BP4 crt. The acceleration voltage is 12KV. To my >surprise, this set has minimal shielding around the rectifier tube, >which raises the question in my mind whether the set pre-dates x-ray >shielding. (I have heard that very early TVs were hazards). >I replaced the rectifier with a diode, but am wondering if I should >also shield the CRT. There is a glass faceplate in front of the tube. I wouldn't worry about it. 12KV (and the P4 phospher) means that it's a BW TV. The early 25KV color TVs were the real problem. Cats used to like sitting on them because they were so nice and warm... -- /* rcarter@wpi.wpi.edu */ /* Amazing */ /* Joseph H. Allen */ int a[1817];main(z,p,q,r){for(p=80;q+p-80;p-=2*a[p])for(z=9;z--;)q=3&(r=time(0) +r*57)/7,q=q?q-1?q-2?1-p%79?-1:0:p%79-77?1:0:p<1659?79:0:p>158?-79:0,q?!a[p+q*2 ]?a[p+=a[p+=q]=q]=q:0:0;for(;q++-1817;)printf(q%79?"%c":"%c\n"," #"[!a[q-1]]);}
rogerm@hpfcso.FC.HP.COM (Roger Mitchell) (06/07/91)
Besides with the current radiation standards established by the DHEW you would have to stick your head inside the picture tube for a hundred years before you would have anything to worry about as far as the radiation subject goes. In fact you would need a lead lined room to put it in to measure any radiation at all over the normal background radation anyhow. Roger M. N0MCR