My experience is limited to Minox-sized TMX in a Minox Daylight Tank, which behaves a bit differently from 35mm development. Also, as part and parcel of the needs of the tiny Minox negative, I give substantially less agitation than recommended by Kodak (every two minutes instead of every thirty seconds) to keep the grain from becoming pronounced.(posted 9093 days ago)Anyway, I've had nice results with D-76 1:1 at the recommended time of 12 minutes at 68. But the contrast does run a bit high, with blocked up highlights and shadows on occasion. (I'm using an Omega D3 condensor enlarger.)
I've recently switched over to XTOL 1:1. But, at least for the Minox Tank and minimal agitation, I've found I have to give substantially more development time to get thoroughly developed negatives. In my latest roll, with two extra minutes of development beyond the recommended time for the temp I was using, I got negs that are ALMOST the right density - two and half minutes will probably be the magic equation. But it's worth doing: the grain is definitely finer than with D-76, and the contrast is tamed considerably.
So, IMHO, you can definitely use D-76 for TMX at Kodak's recommended times (especially if your negative is larger than Minox!), but XTOL is probably better... And with recommended agitation, it might be developed to the right density, although you'll have to experiment: extra time may be necessary.
(And just for the record, I have strangely found that D-76 1:1 is NOT a good soup for TMY [T-Max 400]. I did some half-frame 35mm in it at Kodak's recommended time - but with agitation at 1 minute rather than 30 seconds - and got very contrasty, almost-heavy, noticeably grainy negatives. 5x7 prints from the half-frame TMY negatives viewed side by side with 5x7 prints from half-frame Tri-X negatives [also developed in D-76 1:1 with 1 minute agitation] shot with the same camera are surprising: While the TMY does have more detail/resolution, the grain is FAR better in the TX!
So for 400-speed work - which I only do in half-frame 35mm and larger, not Minox - I'm sticking with good old Tri-X. A grand old emulsion!)
Anyway, I hope this helps!