Brings back a memory or two, aligning a FOCRT on a Honeywell Visicorder that had been dropped, I had repositioned the tube. I didn't have a mirror to watch when I focused the tube so I laid down on the workbench and reached across the chassis to adjust the beam gain and focus. Picture this, the workbench had a shelf that my head was under, it was a maple benchtop and shelf. I brushed the hv lead as I was adjusting, they guys watching said I made 3 cycles after they stopped laughing. My arm hurt for a week. pat On Mon, Aug 19, 2013 at 8:49 AM, Ed Popielarski wrote: > 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] > > ******************************************************** > > The information transmitted is intended only for the person or entity > to which it is addressed and may contain confidential and/or > privileged material. If you are not the addressee, any disclosure, > reproduction, copying, distribution, or other dissemination or use of > this communication is strictly prohibited. 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