Dbx encoded discs

dbx discs had to be played through playback software for the recording to play with the right dynamics. It was developed to compete with Dolby B on cassettes but it never really took off. When it was playing with the right playback level it could give startling results but many cassette player manufacturers would not take it up as they could not see the point in having two noise reduction programs. The one you have of the disc is even rarer because you had to buy a processor that went between your preamp and amp or in your tape loop and the processor would expand the compressed signal to give you pretty awesome realistic playback ( for the time ).
 I remember visiting quite a few audio shows and being treated to "Pictures" quite a few times in a night.

@uberwaltz You are right I should have called it vinyl because when dbx was going around CD was not even invented yet and everyone then called vinyl either discs or records. Sorry for being so old fashioned and giving away my age.

Uber hi, A little story regarding dbx . This was late 70s early 80s and my guitar teacher who was a stunning classical guitarist displayed an interest in a friend of mine who was a recording engineer with the BBC in Glasgow and Edinburgh and he wanted to have some reel to reel tapes to copy onto cassettes so the students could listen to him play pieces they were learning for them to pick up the idiom of the pieces. Now it so happened I worked in a camera shop as a photo producer and the store had a specialist hi fi store up the street a half mile away and many a lunch break I used to have listening to Quad stats 57 and 63 at the time. I remember they had taken on a dbx dealership and this mind you when it was still trying to gain a foothold.          They stocked the device that the amature market had access to it was for recording to the tape recorder with the machine compressing the signal then after recording you played it back this time with the machine expanding the signal. I took my teacher up to Glasgow and we had a couple of hours time in the studio. At first my pal taped my teacher with his normal BBC gear ( Studer at the time ) at 7 1/2 and 15 ips. with no noise reduction which was par for the course then. After an hour my pal jimmy wanted to hear the new dbx unit in action so we put it between the mike mixer and the tape recorder. My teacher then played a piece by Issac Albeniz named Asturias which is a very intricate piano tune which was adapted for guitar.Well he played it back through the monitors and we literally couldn't believe our ears, Jimmy was open mouthed and he had seen and done it all so to speak. I just stood there with a massive grin on my face listening to this box no bigger than a preamp and everything inside it hard wired. The Beeb had at one time pondered Dolby A and B noise reduction but were never really happy so that idea was shelved. This box literally blew away all forms of Dolby noise reduction I had heard up to date. The sound coming out of those monitors was trully awesome as I had heard true master tapes many times but always with that little bit of tape hiss thrown in. If you listen to classical music you quickly learn that it's not always rock music that is the most dynamic it is just that it is usually louder thereby giving you the misconception that it is. The sad news about dbx is the big boys in the recording industry put paid to it. If any of you have any of those discs then if you don't have the dbx box your stylus will just be shoving an overly compressed signal into your preamp.