ADT "Master Tapes", Dexter Gordon, Herbie Hancock, Thelonious Monk

[Neal Pomea]

My nephew came upon ADT recordings when clearing out a storage facility and wishes to know if there is a market for them. I told him I would ask here and see if there is any interest.

Dexter Gordon, One Flight Up
Thelonious Monk, Monk's Dream
Herbie Hancock, Takin' Off

There are numbers for each one but I don't know what they mean. Numbers like 15IPS IEC R2 NEW

He has the ADT equipment too.

Please let me know if you have any information or better yet any interest in purchasing them and I can put the two of you in contact. He is not a member of this discussion group.

Thank you!

 

[jazzbo]

15 IPS is the recording and playback speed for the recording. IEC is a type of equalization.

I think there is a market for these tapes. One suggestion may be to query HDTT website, they transfer tapes into high resolution digital and may be interested in purchasing these:

https://www.highdeftapetransfers.ca/pages/contact-us

https://www.highdeftapetransfers.ca/pages/about-us

Edited 18 hours ago by jazzbo

[Kevin Bresnahan]

Are you talking ADT as in Artificial Double Track tapes? If that's what we're talking about, I would think that those are simply homemade dubs that add ambiance to the stereo signal. Is that how they used to make artificial stereo from mono tapes?

[Neal Pomea]

Thank you, jazzbo and Kevin, for your helpful responses! I will look further into what ADT means and post here what I find.

[JSngry]

8 hours ago, Kevin Bresnahan said:

Are you talking ADT as in Artificial Double Track tapes? If that's what we're talking about, I would think that those are simply homemade dubs that add ambiance to the stereo signal. Is that how they used to make artificial stereo from mono tapes?

https://en.wikipedia.org/wiki/Automatic_double_tracking

The technique was first used by The Beatles on Revolver. 1966 was a few years after any of the three records in question, so homemade does seem likely.

Is there any further provenance on the tapes? And what brand is the hardware?

Sony used to make RTR decks that would allow "multictrack" recordings on two-track tape by bouncing one track over to another while recording a new one onto the track that was being bounced. I don't think that this is exactly the same technique though.

And 15 IPS on the home market was pretty rare until somewhere in the 1970s.

So, I was guess homemade, but.. in whose home?

[Neal Pomea]

Sorry! NOT ADT. ATR Magnetics! See what Google AI says about it. It's supposed to be something of quality between original master tapes that the recording engineer would have and high grade audiophile recordings.