Hi Jay,
Welcome to the forum.
The TD20A series came in a couple of versions. The version most commonly found came with 1/4 track heads with a top speed of 7 1/2 ips. The pro version was 1/2 track with 15 ips.
Only the pro version would be able to play the Tape Project tapes without very expensive changes.
The Tandburgs were very nice machines for the consumer market but not quite as rugged as most pro or pro-sumer machines.
They usually command pretty high prices on the used market and usually need some work to get them running smoothly if they haven't been used recently.
If you're looking for a machine for the Tape Project, I don't think that this is a machine that I'd recommend.
There's some guidelines and examples of machines that are suitable for playing Tape Project tapes located in a sticky above this forum. Check it out.
http://www.tapeproject.com/smf/index.php/topic,20.0.html