[QuadList] AVR-1 Info

[georgenann at aol.com]

Hi Guys,

I just had a visit by Mr. Jim Snyder, I guess most of you know him and the big job he has ahead of him.  I told him I would pass along tips when I would pass a "Brainstone" about quads, and do it here.  If anyone would like to add to anything I put out, please do, or if you want to straighten me out, that's OK too, don't worry, I don't insult, especially if it will help Jim.

Not too long ago I had a reel servo problem on an AVR-1.  In troubleshooting it I wondered if all the lamps in the Vac Cols were lit.  Problem was someone had replaced the lamps with IR Led's and I couldn't see a damn thing.  (Not sure where these machines came from, CBS Archives put them in years ago, had Ampex install them and didn't tell anyone across the street in the Broadcast Center. And they weren't used for years.)

I recalled that most digital cameras are sensitive to IR, so I brought my digital camera in and sure enuf there were the little lights, all lit up.  A couple days later I found the problem was in the Power Supply feeding the "Servo Preamp".

The led's were a good idea, except you can't see where the tape is or if they are lit.  Apparently the "Solar Cells" are sensitive enough to react to the their light properly.  Years ago, I replaced the lamps in the Vac Cols in all of the ACR's at CBS, all 6 of them, but I used hi inten. visabile red led's.  They worked just fine and really looked cool, like something from outer space. Never had one fail either. They were very stable also, never had to adjust the + and - 5V on the preamp board.

I am attempting to attach a couple fotos of this situation to this e-mail, not sure if it will make it to this site, but if not if anyone really cares, just send me an e-mail, I will send them to you directly.

Another problem cropped up, some Bozo broke one of the glass covers in one of the vac cols on the other AVR-1.  Needless to say these are about impossible to replace.  I tried many glass dealers even a scientific glass outfit in Clifton, NJ and no luck.  One of the guys brought in a piece of just plain ground glass cut to the right size and it seems to be OK! (so Far).

Hope this is interesting, if not I think you all have "Delete" buttons on your keyboards, don't hesitate to use them.  (HI)  If it is good, perhaps someone will put ME in for a Nobel Prize.

73,

George Keller

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