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Vintage Television and Video Vintage television and video equipment, programmes, VCRs etc.

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Old 12th Jan 2019, 12:08 am   #21
rambo1152
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Default Re: Quadruplex 2 inch tape

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Originally Posted by beamcurrent View Post
Now I'm no expert on tape, I'm a camera person.

But it may be that if you "dust" the tape with a VERY fine iron or iron oxide you might be able to see the magnetic tracks and determine if it is quad, helical, linear audio by the direction of the tracks.
I don't think there was a 2" helical format and I think we can rule out multi-track audio, that only leaves quad in my opinion.
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Old 12th Jan 2019, 12:36 am   #22
PaulM
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Default Re: Quadruplex 2 inch tape

You beat me to it (and with more detail)! 'Scott Free' rings a bell with me too - some sort of current affairs show, I seem to recall. I'm sure that others will do better!

It certainly looks like Quad wear patterns to me and 2" Helical was super rare. Rank made a machine in the UK but not many were sold as Quad was so dominant and 1" was just starting to appear.

I have two German made Quad tape analysers (complete with CRT waveform monitor) which would certainly reveal what it is but the surest and quickest way is to run it (carefully) through an actual machine.

A special fluid was used in the dim dark past of Quad to 'see' the tracks for editing purposes and a modern equivalent is here: http://www.magneticdeveloper.com/product/dropper-2oz

Related to this, I have been working on and off with an ex-Marconi colleague who has come up with an idea to 'read' the FM on a videotape without physical contact. The idea works - a proof of principle test bed has been made - but it needs substantial (I mean, substantial) investment. Anybody out there with a million or two to spare to develop it? The test rig would certainly reveal the pattern. If anybody is interested, PM me and I will explain how it works.

Best regards,

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Old 12th Jan 2019, 12:44 am   #23
turretslug
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Default Re: Quadruplex 2 inch tape

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Originally Posted by rambo1152 View Post
I don't think there was a 2" helical format
The unusual and complex IVC9000 machines used a 2" helical scan format, but it sounds as if this has been discounted here. I wonder if any examples exist in working order?
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Old 12th Jan 2019, 12:48 am   #24
PaulM
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Default Re: Quadruplex 2 inch tape

The Rank machine I just mentioned was a UK 'version' of the IVC9000 machine. It was rumoured a few years ago that there were two for disposal in north London. I tried to track them down and failed. It was too much to hope that they might have survived . . .

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Old 12th Jan 2019, 12:52 am   #25
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Default Re: Quadruplex 2 inch tape

I wondered if that was the case! I've heard of quite a few cases of "badge-changing", political or otherwise, in the industry....,

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Old 12th Jan 2019, 1:18 am   #26
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Default Re: Quadruplex 2 inch tape

In the 1980s there was a TV programme called 'Scott Free' which featured the one time media darling - but sadly now almost forgotten Selena Scott, traveling around her native Scotland interviewing various characters and viewing interesting locations.
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Old 12th Jan 2019, 1:57 am   #27
rambo1152
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Default Re: Quadruplex 2 inch tape

I remember her, and she did indeed present a programme called Scott Free,

https://www.imdb.com/title/tt2178617...nm_flmg_slf_32

But doesn't the team think that Quad was beginning to be a legacy format by 1986?
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Old 12th Jan 2019, 5:04 pm   #28
red16v
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Default Re: Quadruplex 2 inch tape

Quote:
Originally Posted by rambo1152 View Post
I remember her, and she did indeed present a programme called Scott Free,

https://www.imdb.com/title/tt2178617...nm_flmg_slf_32

But doesn't the team think that Quad was beginning to be a legacy format by 1986?
Quad was very much on the way out in 1986. Ampex and RCA, the two main manufacturers, had long stopped production of their last Quad machines and 1” was firmly in the ascendancy.

“Scott free” also brings up references to a Ridley and Tony Scott production company with references going back to the 1970’s. A hunch tells me that “20 to Saturday” is the key phrase here but I cannot find anything pertinent myself.

I do not think ‘the team’ should put too much emphasise on the cross tape creases seen in the original pictures - that looks to me like simple tape creases which are (were!) quite common on the end of a quad tape.

Edivue was the common material used to develop the magnetic tracks on video tape, nasty stuff by reputation - it was, as others have outlined, fine metal particles held in a solvent suspension.

The IVC 2” helical scan format was introduced too late to compete with Quad. It was, by reputation, superior to Quad technically but few machines existed in the UK. I knew of only one and that was in a television facility house in London (Maybe Rank Video Services if Rank badge engineered them?). I have seen references to a working machine but that was in the USA.

Edited to add. The original Quad format was developed in the US as we know and the linear tape speed was set at 15ips. When the format was altered to suit European standards the tape speed had to be increased to 15.625 ips to accommodate different EU specs and the mechanical parts of the original design. Therefore for any given running time a reel of EU tape had to be longer than it’s equivalent US tape as it runs faster. No tape manufacturer was going to set up to do that! As a consequence quad tape lengths were manufactured to suit the EU market meaning our US colleagues got longer running times out of any particular tape than their EU counterparts. Not many people know that!

Last edited by red16v; 12th Jan 2019 at 5:15 pm.
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Old 12th Jan 2019, 7:07 pm   #29
peterpixel
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Default Re: Quadruplex 2 inch tape

An alternative to Edivue (post #28) was marketed as the "Vulture Video Verifier" and was a small bottle containing the metal particles which was mixed with alcohol then applied to the tape.The particles aligned themselves with the video tracks and the liquid evaporated leaving the visual pattern of the tracks.I never tried mechanical editing of tapes but did use the method for teaching purposes after using a fixative spray.I still have a bottle of the stuff.Peter.
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Old 12th Jan 2019, 9:14 pm   #30
retroteck
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Default Re: Quadruplex 2 inch tape

When I started working at Leeds University Television Service in 1974, we had a pair of Ampex 650
2" helical machines, (the Euro version of the 660).
These machines ran at fairly slow linear tape speed of about 3.3/4ips as far as I can remember
and took large reels that could record over 3 hours on one reel.
They had a really nice solenoid controlled smooth transport, much better than the transport on
the later Ampex 1" type A machines that we also had.

https://www.google.co.uk/search?q=am...=1547322871207

Rod
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