I picked up the MT72 on Thursday. The information on where it came from was sketchy. All I got was that it was from a studio near Philadelphia. I haven't turned it on yet. The heads are trashed but the transport looks okay. It's beautifully simple. It's very compact. The transport is only about 9" deep. It's basically portable. There are many things to admire about this transport.
It doesn't seem the Telefunken M15A was ever offered in a 15ips/30ips model. The M20/M21 seems like that was the first model to offer it. It also doesn't look like a preview M20 was ever offered. This is all gleaned from reading the promotional literature. I could be wrong.
Hilpert offers 15ips/30ips conversion for the M15 but it wouldn't work for this preview model as the bar that adjusts the program delay couldn't be made long enough for 30ips operation. Luckily this will avoid an intervention. Acquiring a fleet of them is not an option. For 7.5ips/15ips it's a nice deck.