What Is It #1984v2.1Beta

I'll be careful how much I say since I'm not a student, ...
The original question's been answered, thus the thread is open to all. It's impossible to tell from the scale whether or not Brad's block is for 1/4" tape or other. I agree that most blocks only permitted 90° and 45° miters. The addition of an 80°(?) seems odd to me as well.
 
I'll be careful how much I say since I'm not a student, but my audio tape splicing blocks only have two blade grooves; one at 90 and one at 45(?) degrees. Since this has three, I don't necessarily think it is for audio tape, at least not for 1/4" tape.
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I think the 30 degree or whatever it is slot was not on all versions, some apparently had 45 and 90, some 45 and 30 and some all three.

The venerable Otari MX-5050 with integrated splicing block, http://www.google.com/imgres?imgurl=http://www.audiokarma.org/gallery/data/524/18149Otari_MX5050.jpg&imgrefurl=http://www.audiokarma.org/forums/showthread.php?t%3D456278&h=1185&w=1160&sz=302&tbnid=MaHpTtSGKJAl-M:&tbnh=90&tbnw=88&prev=/search%3Fq%3Dotari%2Bmx5050%26tbm%3Disch%26tbo%3Du&zoom=1&q=otari+mx5050&usg=__ji08kqHkyD8mvZfAL6a9Q1mymcY=&docid=hRnmRi3lA_BMSM&hl=en&sa=X&ei=TkwdUcygDYvs8gTNqYGYDA&sqi=2&ved=0CC8Q9QEwAA&dur=636.

Could you see if you started a class today by asking if everyone brought their razor blade?
 
OK, folks, here's a related question for you: Why were the angles slots placed in the block, and which slot would you prefer to use, 90 deg. or angled?
 
My thought behind the 80(?) degree miter is this: In quadruplex recording on 2" tape, video tracks are nearly perpendicular to the tape, (not quite 90 degrees). Therefore, if making a splice in 2" tape, it seems like you would need to cut at the same angle as the video tracks. Otherwise you might get video anomalies if the splice cut through multiple tracks. This is unlike audio recording where you want an angled cut so that the splice is silent (hence the 45 degree miter in the block).

That is just my thinking on this. I am no expert and don't pretend to be! I've never worked with any video tape larger than 1/2" VHS, so I have no real experience. This is just based on what I've read about early video tape technologies.
 
Nelson, I was just thinking the same thing. Possibly video tape.

For 7 years at Portland Repertory I used 3 console mounted Otari reel to reels. What did I Love? Having a tape break right as the house to half cue was called.
3 R to R's, a cassette deck and occasionally a CD player < OOhhh Aaaaah> and running the show on the lovley Panache'.
Techs were a hoot too; LD yelling about updaying a cue while the SD was screaming for you to, ".. add 3 more seconds between those two cues !!!! "

God I feel old right now.
 
A 45 degree splice was reputed to have no effect on the stereo image--so it's the one I always used.
Also a longer length of the actual splice and tension applied at an angle to the splice, so I assumed more durable and my default. However, if I was trying to fine cut a specific word or sound then I might want the cut accuracy of the 90 degree.
 
I always assumed that the 45 degree splice in audio tape was to reduce the chance for an audible "pop" at the splice. I was talking to a friend of mine from the broadcast industry and he said that he was taught to cut at 45 degrees so the splice was stronger (going along with what Brad said).
 

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