Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!sun-barr!olivea!samsung!crackers!m2c!wpi.WPI.EDU!rcarter From: rcarter@wpi.WPI.EDU (Randolph Carter) Newsgroups: sci.electronics Subject: Re: Early CRT X-RAY Emissions Message-ID: <1991Jun6.160633.28186@wpi.WPI.EDU> Date: 6 Jun 91 16:06:33 GMT References: Distribution: sci Organization: Kadath Tours, Inc. Lines: 18 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]]);}