Yes, James. I learned first-hand how much that hurts.
This was back in the late '70's (ears still quite wet) when I had taken a job debugging arcade games in the NY Metro area. I had just finished repairing 5 square color CRT displays and set them up in a row from a common composite video source to align the guns. What I didn't notice was one of the 5 tubes was rotated 90 degrees, so the first few had the 2nd anode below the CRT, but the one "oddball" had it positioned right where my arm could make contact while reaching over to adjust the horiz. & vert. size pots on the rear of the chassis. I thought someone hit me with a door (huh?) and found myself on the floor salivating like a mad dog. Apparently, the dielectric strength of the rubber cup isn't high enough for this maneuver. OUCH! Never did that again! (remember the electric fence analog earlier!)
Ed Popielarski
Engineering Manager
970 NE 21st Ct.
Oak Harbor, Wa. 98277
Ph: 360-675-1322
Fx: 206-624-0965
Cl: 949-581-6601
https://maps.google.com/maps/myplaces?hl=en&ll=48.315753,-122.643578&spn=0.011188,0.033023&ctz=420&t=m&z=16&iwloc=A
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of James Head
Sent: Monday, August 19, 2013 8:20 AM
To: [log in to unmask]
Subject: Re: [TN] Refreshment
When I used to work for Toshiba at the TV plant in Plymouth we were meant to break the tube necks before disposing of CRTs but we thought it was more fun to put them in the crusher unbroken and watch the old crusher shudder. We once had a high-end special 44 inch tube. We wheeled it out and very carefully lifted it up to place it gently face down in the crusher on its own, pushed the green button and hurried away. There was a low thumping bang and the whole cage around the crusher rattled. Crushing flat panels was not as exciting.
We used two large screw drivers to discharge the tube before working on a set. Holding both screw drivers like sheers so they touched each other, we touched one screw driver on the ground side of the tube and wriggled the other under the anode cap. I had a few 35 kV shocks though when I forgot to only hold the screwdriver by the handle (doh!). Fortunately I remembered to hold them correctly the one time when I tried to discharge a tube where the TV was still switched on - although we used 1:1 isolation transformers I suspect that it still could have been very painful.
James
James Head BEng CID+ MIIE MIET
Senior PCB CAD Engineer
Crowcon Detection Instruments Limited
2 Blacklands Way
Abingdon Business Park
ABINGDON
OX14 1DY
Telephone: 01235 557700 extension 289
Fax: 07092024504
E-mail: [log in to unmask]
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