Betamax

[proximity4]

Betamax (sometimes called Beta) is a home videocassette tape recording format developed by Sony, released on May 10, 1975. The cassettes contain 1/2-inch (12.7mm)-wide videotape in a design similar to the earlier, professional 3/4-inch (19.05mm) U-matic format. The format is generally considered obsolete, though it is still used in specialist applications by a small minority of people.
Like the rival videotape format VHS (introduced in October 1977 by JVC), Betamax had no guard band and used azimuth recording to reduce crosstalk. According to Sony's own history webpages, the name came from a double meaning: beta being the Japanese word used to describe the way signals were recorded onto the tape, and from the fact that when the tape ran through the transport, it looked like the Greek letter beta (β). The suffix -max came from "maximum", to suggest greatness.
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[MacGyver]

one of the rarest BETA VCRs; PIONEER's SONY OEMed
clone of the venerable SL-HF900;

[MacGyver]

[Adam D]

That's surly is a rare clone of the SL-HF900, by Pioneer. Those editor decks are very pricey on Ebay.

[MacGyver]

i understand that the 1985 SONY SL-HF900
was the best selling BETAMAX VCR of all time...