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Article #3Re: Using mobile phone as an internet radio
From: Michael A. Terrell
Date: Mon, 15 Oct 2012 15:52
Date: Mon, 15 Oct 2012 15:52
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Jasen Betts wrote: > > On 2012-10-12, Michael A. Terrell <mike.terrell@earthlink.net> wrote: > > > The projector bulbs in the old RCA TP66 film chain were mounted in a > > vertical line. If you used the bottom lamp, and let it switch the to > > spare on top, they had a short life of a little over 20 hours. If you > > ran the top lamp, with the spare at the bottom, the life was over five > > times longer. The projector used a motorized track, with a relay in > > series with the filament. When the filament opened, the relay dropped > > out and turned on the motor. In either position, it would run to look > > for the other bulb when the one in use failed. I would pull the bad > > lamp and move the good lamp to the top at the next film change, then put > > the new lamp in the bottom socket. I averaged over 130 hours per lamp, > > that way. > > Are you saying that 20 hours resting above the working lamp knocked 100 > hours off the lifeime? In other words, if you did the opposite did that > reduce the life of every lamp to 20 hours. It did it to three in a row. We were on the air with film for about 75 hours a week, on a two projector film chain. We were issued six lamps for three months, then had to find other sources. > Or was it 130 hours above the working lamp that reduced the life of > the spare by 100 hours? > > It seems surprising that the lamps were so readily damaged by > environmental heat They were in a steel & aluminum box with little ventilation, and in a non air conditioned environment. the control room could reach 95 degrees on summer afternoons. The glass would distort & sag before the filament opened. The projectors were run off a motorized Sola Adjust-A-Volt to keep the line voltage at 120 V. It was used instead of a CVT, because of the cap run motors in the projectors. You couldn't leave the doors open, because wild animals would come into the building. The only thing that couldn't were the huge buffalo that wouldn't fit through the door.
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Date: Mon, 15 Oct 2012 11:52:21 -0400
From: "Michael A. Terrell" <mike.terrell@earthlink.net>
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Newsgroups: uk.tech.digital-tv,24hoursupport.helpdesk,uk.telecom.mobile,sci.electronics.basics,sci.electronics.repair
Subject: Re: Using mobile phone as an internet radio
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