Hello MikeWiz...unfortunately Mr. Kennedy has not frequented QQ since 2005. I do believe he's been contacted by others independent of this forum within the last several years. But not on here.
Audionics Space & Image Composer / Tate Audio
- Thread starter Steve Kennedy
- Start date
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True, that. I might suggest to @MikeWiz send a PM to steve Kennedy as that is usually copied to e mail & might get his attention.
I know I'm replying to an almost 4 year old post, but as I came upon this thread I felt I had to.
Fist of all I want to thank you for uploading a photo of the Cat150D with the boards separated, it's something I've been waiting to see for ages!
Second I think I can shed some light on what's going on with that board and what does the decoding; pretty much all of it is involved! It's the discrete version of Dolby Pro Logic used before ICs from Sanyo and PMY/Analog Devices became available (even before it was introduced to the consumer market.)
My knowledge of electronics is limited, but I think that the components along the left edge are the log-difference amplifiers that detect dominance, the ones around the middle part of the board the time integration of the control signals, the two ICs on the right are the VCAs, and the rows of resistors and the opamps in the top right corner are the combining matrix. In the bottom right corner is the bandpass filter and B-type NR for the surround channel on either end of the connection to the delay board. Quite a neat design.
This is where the mystery deepens though. I saw a 150B in an eBay listing and found that aside from some small alterations between the boards, it was unmistakably also a Dolby Pro Logic board (with a 146B decoder section.)
That means unless it was the delay line from a Cat 150B with a decoder section from a later board, 150B through F are all Dolby Pro Logic, and only the 150 and 150A use the Tate DES. I'd assume the Exar chips would be found on the 150A though I could be wrong.
furui_suterioo
Quad & 70s Enthusiast
Hi,I know I'm replying to an almost 4 year old post, but as I came upon this thread I felt I had to.
Fist of all I want to thank you for uploading a photo of the Cat150D with the boards separated, it's something I've been waiting to see for ages!
Second I think I can shed some light on what's going on with that board and what does the decoding; pretty much all of it is involved! It's the discrete version of Dolby Pro Logic used before ICs from Sanyo and PMY/Analog Devices became available (even before it was introduced to the consumer market.)
My knowledge of electronics is limited, but I think that the components along the left edge are the log-difference amplifiers that detect dominance, the ones around the middle part of the board the time integration of the control signals, the two ICs on the right are the VCAs, and the rows of resistors and the opamps in the top right corner are the combining matrix. In the bottom right corner is the bandpass filter and B-type NR for the surround channel on either end of the connection to the delay board. Quite a neat design.
This is where the mystery deepens though. I saw a 150B in an eBay listing and found that aside from some small alterations between the boards, it was unmistakably also a Dolby Pro Logic board (with a 146B decoder section.)
That means unless it was the delay line from a Cat 150B with a decoder section from a later board, 150B through F are all Dolby Pro Logic, and only the 150 and 150A use the Tate DES. I'd assume the Exar chips would be found on the 150A though I could be wrong.
Thanks for the info. As you may have read on this thread, I have 2 150a boards and both have the National chips. I still have a suspition the 150b might have the Exars but their price is higher than what I want to pay. I have since sold my Tate 101a for this reason. I was also able to resell the 150d board quickly. The Audionics Tate 1 is my keeper since I have the spares.
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