Holy Sh-t, a portable broadcast VCR from 1967... - Page 1
Forum section: electronics / general

author: BrianHG
author_rank: Super Contributor
timestamp: January 10, 2025, 12:54:29 am
content: I can not believe it....But, here it is...The Ampex VR-3000

author: EPAIII
author_rank: Super Contributor
timestamp: January 12, 2025, 09:39:43 am
content: WOW! A real blast from MY past!I worked at a number of TV stations in that era but none of them could even consider that Ampex 3000. I suspect sales were mostly to the networks and just a few of the stations in top markets like New York, Los Angeles, Chicago, etc.The second half of the video is more of what I experienced. And a lot of RCA equipment is notably missing. But Ampex did rule the roust back then.

author: SiliconWizard
author_rank: Super Contributor
timestamp: January 13, 2025, 12:04:36 am
content: Yes, the press release started like so:QuoteFun times.In terms of portable audio tape recorders, Nagra kind of ruled back then.Oh, and remember this miniature one?

author: alpher
author_rank: Frequent Contributor
timestamp: January 13, 2025, 01:05:59 am
content: Technically it isn't a VCR, VTR may be a correct term.

author: Analog Kid
author_rank: Super Contributor
timestamp: January 13, 2025, 05:02:16 am
content: Quote from: SiliconWizard on January 13, 2025, 12:04:36 amI've always lusted after owning a Nagra.Closest I ever got was when I bought my Sony Walkman Pro. A damn good (cassette) recorder, but it ain't no Nagra.

author: GLouie
author_rank: Regular Contributor
timestamp: January 13, 2025, 05:24:12 pm
content: Don't forget the 80s Ampex-Nagra VPR5, 1" C machine.https://www.nagraaudio.com/product/trvr-copy/

author: BrianHG
author_rank: Super Contributor
timestamp: January 13, 2025, 06:14:40 pm
content: Quote from: GLouie on January 13, 2025, 05:24:12 pmThey already had IC in the 80s, so, pointless.Do you have any idea how uncommon compact portable high-tech we had in the 1967?Most radios and TV still used vacuum tubes. The first commercial transistor radio, the Regency TR-1, was only released in 1954 second by the Sony TR-63 was released 3 years later in 1957. We are talking about 3 years between portable devices which only had 3-4 transistors in them. Next thing, 10 years later, this portable VCR with something like over 100 transistors including a few power transistors driving motors and servo loops, all being capable of being battery powered where the first ICs were some military grade tech reserved for the Apollo moon landing program.

author: schmitt trigger
author_rank: Super Contributor
timestamp: January 13, 2025, 06:25:23 pm
content: An even more impressive breakthrough, it was the Ampex HS-100 instant replay video recorder. It recorded NTSC color analog video on a hard disk, which enabled repeating the last 30 seconds, freeze frame, and forward and backward slow-motion.At $110,000 in 1967 dollars, ($1,062,134 in today’s dollars) its use would be restricted to TV networks broadcasting a major sports event. And definitely NOT portable!http://www.vtoldboys.com/editingmuseum/hs100.htm

author: BrianHG
author_rank: Super Contributor
timestamp: January 13, 2025, 07:05:35 pm
content: Quote from: schmitt trigger on January 13, 2025, 06:25:23 pm4.2mhz bandwidth meaning around 8mhz sample rate at 30 seconds = 240mb in 1967 is it was digital.Still impressive if it was an analog recording with frame freeze and jumping or 30 seconds worth of video.Maybe it was a huge drum drive with a sliding head?I cant find any specs for the Ampex HS-100/200 anywhere.

author: schmitt trigger
author_rank: Super Contributor
timestamp: January 13, 2025, 08:01:17 pm
content: Check the HS-100 press kit in the following web page.http://digitrakcom.com/page8.html

author: aeg
author_rank: Regular Contributor
timestamp: January 14, 2025, 04:06:16 am
content: Quote from: BrianHG on January 13, 2025, 07:05:35 pmNot specific to the HS-100 but see chapter 15 "Slow Motion Techniques" of Videotape Recording 3rd edition for a description of an analog magnetic videodisc system with a 15 second per disc capacity (7.5 seconds per surface), two discs for 30 seconds.

author: BrianHG
author_rank: Super Contributor
timestamp: January 14, 2025, 04:48:48 am
content: Quote from: schmitt trigger on January 13, 2025, 08:01:17 pmMy guess is that its an analog recording which operated like a CAV encoded analog video laser disc which also allowed multi-speed and multi-direction playback by moving the read head at every frame during the v-sync period on the disc.

author: schmitt trigger
author_rank: Super Contributor
timestamp: January 14, 2025, 04:57:18 pm
content: It was an impressive piece of technology for the late 1960s.

author: EPAIII
author_rank: Super Contributor
timestamp: January 15, 2025, 06:30:28 am
content: The references to "low band" and "high band" in the literature tell you that it was an analog recording technique. To be specific on both the HS-100 and on the quad video recorders of that day, they used a system of FM modulation of the one Volt, base band, NTSC (or PAL or SECAM) video signal. There were different modulation standards for low band monochrome, low band color, and high band which encompassed both.I can not recall the exact frequencies involved but the low band color modulation had an FM deviation of only 1Mhz from sync tip to peak white. The high band had several times that deviation plus a base frequency around 10 Mhz which was a good deal higher then that of low band. This, of course meant that the high band recordings had a far superior signal to noise ratio.This compression of the full bandwidth of a 4.5 Mhz video signal into a smaller bandwidth did require pre and post emphasis. And there were side bands although the upper ones were limited by the overall bandwidth of the system.These numbers were primarily determined by the ability to produce the video heads with gaps that were small enough and consistent enough.A side story that I just recalled: while working at a UHF station in New Orleans the sales department wanted to record a two hour sport event, probably football games. Other machines were busy so only one was available and there was no break in the games. The quad recorders of the day were limited to the reel size which held only 1 hour and 30 minutes of tape. I contacted Ampex's tape salesman and inquired about larger reels of tape. He said they could provide them,but no VTR could handle them. We had RCA TR-22s with a sloped front panel. I bought one reel of 120 minute long tape and sure enough it scraped on one of the indicator lights at the top of that front panel. I removed the plastic lens from that light and the one on the other side and there was just barely enough clearance for the reels to turn.Also the reel tensions had to be very carefully adjusted for the greater mass of the larger reels. Even then,instead of the normal 7 or 9 seconds, we had to allow at least 30 seconds for the machine to come up to speed and stabilize before the recording was good. We recorded and played back the entire season of games with no problems - except people holding their breath for that 30 seconds. And an occasional finger lightly dragging on the reel to dampen the oscillations.I bet we were the only TV station in the country buying 120 minute reels of 2" video tape. Perhaps the world.Quote from: BrianHG on January 13, 2025, 07:05:35 pm

author: schmitt trigger
author_rank: Super Contributor
timestamp: January 16, 2025, 12:01:57 am
content: Literally a mirror-polished disk.

author: temperance
author_rank: Super Contributor
timestamp: January 16, 2025, 12:54:51 am
content: Nagra, The Tape Recorder. I looked at their website and they have service manuals for some old equipment.https://analog.nagraaudio.com/

author: coppice
author_rank: Super Contributor
timestamp: January 16, 2025, 01:44:43 am
content: The most intriguing thing is the camera used a plumbicon. All the plumbicons I've seen could only be used in a studio camera, where they were the right way up at all times. That included during shipping. They were supplied in a gimbal in a large box, so the tube itself couldn't be turned up the wrong way. If you did, there was always enough debris in the vacuum envelope to get onto the face of the tube and ruin it.