[QuadList] Dolby Question

[Scott D. Smith]

Don:

Those are pretty esoteric. Not sure if I have anything in my old 
literature that deals with the 380 processors. As best as I can recall, 
both the CAT 55 cards and 255 cards are Dolby A. I think the difference 
is the chip sets, and the I believe the 255 is dual channel, as opposed 
to the single channel CAT 55. Dolby had a few different cards they 
released for VTR use, including the CAT 155, 221 and CAT 226.

Dolby isn't the company it used to be. Trying to find anyone there with 
info on their old products is difficult, to say the least. I think the 
CAT 55 cards were designed around 1976, and released in summer of 1979.

--Scott

Scott D. Smith CAS
Chicago Audio Works, Inc.


On 5/5/2014 5:40 PM, Don Norwood wrote:
>
>
> This isn't exactly a quad topic, but the Dolby units in question can 
> be used to process Dolby-A encoded quad tapes!
> I have several Dolby 380 units which are two-channel Dolby A with 
> interfaces for the Ampex VPR-3.  Two of the units use Cat 55 cards 
> which is what the manual I have shows in the frame, but one uses Cat 
> 225 cards instead.  Anyone know what the difference is between the 55 
> and 225 cards?  An inquiry to Dolby yielded a non-helpful reply.
> Don Norwood
> Digitrak Communications, Inc.
> www.digitrakcom.com <http://www.digitrakcom.com>
>
>
>
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