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Studer A80 RC modifications for 1/2-inch two track and other modifications

Filed under: project notes,Studer A80 — 2012-01-20 by Richard L. Hess — Last Edit 2013-10-09 by Richard L. Hess

In a discussion on 2012-01-20 in the New Studer list, Todor Dimitrov posted the differences between the record and repro boards between a 1/4-inch and a 1/2-inch two-track A80RC repro cards. Here are the changed components for the 1/2-inch version. There are five different oscillator versions in the manual, including one for 1/2-inch.

RECORD: C34=68pF
REPRO: R1=100K; R21=330

Note that the mechanical modifications between 1/4 and 1/2-inch tape handling may be substantially more complex in terms of tuning the transport. I know of no definitive notes on this subject. [Added 2013-10-09]

CBC A80RC Repro capacitor mod

I had previously posted in the original (and now reconstituted) Studer List on 2008-04-24 that there were other extant and possible modifications. Here is a slightly edited and reformatted version of that post:

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Studer A80 Covers — protection and more work area

Filed under: archive operations,infrastructure,Studer A80 — 2007-11-19 by Richard L. Hess — Last Edit 2011-03-07 by Richard L. Hess

A simple, 5-sided box solves two problems:
–Protection of the Studer A80
–Providing more work surface

Studer A80 cover

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Studer A80RC mod for either tension sensor stop

Filed under: Studer A80 — 2008-06-02 by Richard L. Hess — Last Edit 2009-11-06 by Richard L. Hess

The Studer A80RC as designed stops only when both tension sensors lose tension. When using fragile archival tapes, especially at slower speeds, this creates some difficulties as the tape end weaves through the head block. Here is a modification which makes the A80RC operate like an A810, stopping the tape when either tension sensor looses tension. The mod is completely done on the 1.081.393 Command Receiver board and involves adding two parts and removing one.

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