No! Not compatible unless you installed 8 track on 1/4" tape heads and aligned them correctly. Cartridge tape also has special lubrication. 3 3/4 IPS speed used. NAB Equalization used. Standard home format open reel uses 4 tracks on 1/4" tape. There are 8 tracks on 1/4" tape but they run at 15 or even 30 IPS and use noise reduction and use CCIR/IEC equalization.
Uh, Kent?
I think the OP was referring to 8 track cartridges, not open reel. That would be 3-3/4 ips, not 15 or 30.
And yes, the tape itself will work fine on a reel-to-reel - I've done it. The back lubrication on endless loop tape won't affect its use in an open reel configuration.
99.9 percent of open reel machines used at home do not have 8 track playback heads installed, they have 1/4 track heads installed.
Hmmm. Then the question would be if one had a "project" 8-track player one could cannibalize the head from, could it be successfully installed into a "project" reel-to-reel machine to play the 8-track as wound onto a reel? Purely mind wanderings on my part, thinking of this as a project. Of course the quick fix would probably be to get a splicing kit for any damaged 8-tracks, repair it, and play it AS an 8-track in a suitable machine. I am wondering what would be required as far as bias of the head, alignment azimuth, etc. And most consumer machines play at 3-1/4, 7-1/2 IPS so that wouldn't be a problem.