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This topic comprises 3 pages: 1 2 3
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Author
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Topic: Video Tape Recorders
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Bruce McGee
Phenomenal Film Handler

Posts: 1776
From: Asheville, NC USA... Nowhere in Particular.
Registered: Aug 1999
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posted 07-25-2001 12:37 PM
Since it was brought up...I have a Zenith (JVC built) VHS from 1984 that weighs a ton. I have used it as a loaner machine since 1992, and other than belts, and an occasional cleaning, it has never failed me not once. I have a Sony SuperBeta from 1986 that is used anytime someone has some home video that they want copied to VHS. It has never failed. I have a similar NEC machine with Hi-Fi sound with linear stereo. They dropped the linear stereo in 1985. These machines were well-built, as you know, Jesse Jerry: We had some troubles with the 2-tuner systems when they first came out. Hitachi was very helpful and took care of everything. I never had a problem dealing with them in the 16 years I was in business. John P: I started working on TV's when they had more tubes than transistors!! I shuddered when I worked on my first VCR: a Sony SL-5000 from 1976. I think the owner still has it, and yes, it was still running the last time I asked. I HATE trashing all of the machines that I do. Seems like there are less and less field servicable anythings out there. I still keep some of the Motorola Quasar TV modules around for a certain customer. His set, built in 1970, is still going strong, and is on its 3rd kine (picture tube) He says he will junk it when I can no longer fix it for him. It's a big beautiful cabinet, and I understand why he keeps it. My newer VCR's are both Sony's, and have both had to have their POWER SUPPLY modules rebuilt twice. They (Sony) keep telling me that it is probably surges in the line killing them. If this is so, why is nothing else getting blown up? This last rebuild, I upgraded several diodes, caps, and resistors. Has not blown again. I hate Sony. The VEGAS that I have seen are not that beautiful, and I noticed the convergence errors in the store! If I am paying that rediculous amount for a damn TV, then it better be damn perfect when I get it!! (end of rant.)
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Bruce McGee
Phenomenal Film Handler

Posts: 1776
From: Asheville, NC USA... Nowhere in Particular.
Registered: Aug 1999
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posted 07-25-2001 08:39 PM
Joe: You are absolutely correct, as usual. I am not even going to correct the previous post so that you wont look dumb.  WEGA WEGA WEGA OK. I think I have it right now. Whew. I was thinking for some reason of the Chevy Vega when I was typng. Thats another topic! I have bought exactly ONE new TV for myself: a SONY 27" XBR with excellent convergence to the edges of the screen. It's been running 8 years now, and I've touched nothing in the kine drive/screen circuitry. The power supply IC has been changed twice. After the 2nd time, I installed a computer fan in there beside the IC heat sink. That was 6 years ago, and it has run just fine since. All but one of my TV's I've owned have been nice ones that were brought in for repairs, fixed, and never picked up even after many calls to the customer. The odd one is my 1960 RCA color set with the wonderful round screen. Full of tubes. It looks almost-decent after it runs for about 15 minutes. What's convergence? 
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John Pytlak
Film God

Posts: 9987
From: Rochester, NY 14650-1922
Registered: Jan 2000
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posted 07-26-2001 10:43 AM
Jerry said: "However, all those folks who threw away their 8mm film after having it copied to VHS are going to be kicking themselves."Transferring home movies to video does make watching them more convenient, but constantly changing video formats mandate keeping the original film so it can be transferred again as current video formats become obsolete. Having a "man-readable" image has its advantages, and the relatively simple mechanics of a projector can be maintained or duplicated in the future. http://www.kodak.com/country/US/en/motion/story/fact6.shtml "Film is an analog image. It’s human readable, and it’s independent of many things concerning digital today, like its multitude of different formats. Film can be scanned by today’s high resolution scanners (at resolutions and information densities greater than digital video capture devices) – and/or any future scanning technology (which may pull out even more information from the same image). As a result, we use the term “future-proof” to show film’s compatibility into the foreseeable future. " ------------------ John P. Pytlak, Senior Technical Specialist Worldwide Technical Services, Entertainment Imaging Eastman Kodak Company Research Labs, Building 69, Room 7419 Rochester, New York, 14650-1922 USA Tel: 716-477-5325 Cell: 716-781-4036 Fax: 716-722-7243 E-Mail: john.pytlak@kodak.com Web site: http://www.kodak.com/go/motion
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John Pytlak
Film God

Posts: 9987
From: Rochester, NY 14650-1922
Registered: Jan 2000
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posted 07-26-2001 04:17 PM
Is the SVHS tape itself the same as VHS (e.g. formulation, coercivity, particle size and density, etc.) and just higher quality, or is it a different formulation altogether? For example, there is a definite formulation difference for "high bias" or "metal" audio cassettes compared to normal oxide, requiring different recording parameters.------------------ John P. Pytlak, Senior Technical Specialist Worldwide Technical Services, Entertainment Imaging Eastman Kodak Company Research Labs, Building 69, Room 7419 Rochester, New York, 14650-1922 USA Tel: 716-477-5325 Cell: 716-781-4036 Fax: 716-722-7243 E-Mail: john.pytlak@kodak.com Web site: http://www.kodak.com/go/motion
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Evans A Criswell
Phenomenal Film Handler

Posts: 1579
From: Huntsville, AL, USA
Registered: Mar 2000
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posted 07-27-2001 10:01 AM
I found a WWW site that is pretty good about explaining how VHS VCRs work that is easy to understand, and has some diagrams.Here's the link. VHS uses different frequencies for color (0.129MHz to 1.129MHz) and luminance (3.4 MHz to 4.4 MHz). The center frequency and deviation of the luminance portion are different in VHS (3.4 MHz to 4.4 MHz) and SVHS (5.4MHz to 7.0MHz). I believe the main problem with VHS was the interference of the lower FM sideband from the luminance portion with the color signal. It appears the the professor's main reference for his information is the exact same book I have, but can't find at the moment. ------------------ Evans A Criswell Huntsville-Decatur Movie Theatre Info Site
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