I won't go as far as Blue Bear and say if it's not 2"/24-trk. then it's not pro, but I will say I understand the "jist" of that statement.
Quite frankly, I feel design and component and hardware quality is going to make much more of a difference than track-width! Anyone who has ever used a Fostex G24-S (1"/24-trk.; 0.0415 ipt w/ Dolby S) can confirm that general statement!
If it's a 2"/24-trk., then more than likely, the design and components and hardware quality used are going to be at least noticeably better than the more "budget" open-reel recorders. We know this is not always the case, but I bet we can make a general statment saying that... Assuming we know there are exemptions to that.
But even with that said, to tell you the truth, this whole "analog vs. digital" when it comes to multi-track recorders, I find it a ridiculous joke! Unless it's 2"/24-trk. @ 15ips with Dolby SR, give me 24-bit/24-track with good converters (and being able to upgrade the converters as I have the money) and a decent analog console to mix through, and I'll be happy!
The house engineer at a small, popluar studio in Berkley, CA (which has high-profile acts under their credits) has told me they have a 2"/24-trk. Otari MTR-90II running @ 30ips, 4 (32-trks.) ADAT XT20s, and full-blown 32in/64out Protools. Over the past 8 years, 85% of the recordings he's done have been on the first ADATs! In the past 2 years 85% of the recordings he's done have been on ADAT XT20s. He says no matter what the format, when he listens to the absolute finished product, he can't tell which format it was recorded on. "Regardless of the format, I'm going to make it sound good!" I should note that the console is an Otari Elite+ and minimal, but very selective high-quality outbaord gear.
And that's what I feel too! I had 3 ADATXTs for quite awhile. Then I added a Tascam TSR-8 for 2 years. I loved that thing! Came to find-out that I like how the dbx Type I NR reacts to the recorder with 456 tape more the fact that it is "analog"! It was nice to have around as vocals, electric guitar, and drums sounded great on the thing! BUT, it is only 8-tracks! Yeah, I was successful with syncing it up with the ADATXTs on occasion (after hours of frustation), but most of the time, it just wouldn't work! Most "budget" open-reels don't have a good enough transport running smooth enough to pump the SMPTE off tape so that the BRC can keep the ADATs satisfied and in sync with the open-reel machine.
So, I used
my TSR-8 on the rare occasion I didn't need more than 8-tracks. Of course, I finially realized I didn't use it often enough to justify keeping it around!
What I'm trying to emphasize is that for me, I find most all the other gear seems to have a lot larger factor on my end results than anything else (besides experience, which I feel is the greatest factor, all-else being the same)! The monitoring system is probably the #1 when it comes to gear. I mean no matter what comes in, you better be able to hear it, right? I too am guilty of not putting enough into my monitoring right off the get-go nor yet! Mics and preamps in combination is probably #2. A/D conveters (if using a digital muti-track) would be #3. I mean it can only be as good as what goes in, right? I too am guilty of not buying a dedicated 2-ch. A/D yet, like I should! Although my multi-track recorder was chosen with the converters top priority in mind. Compression would be #4 and Console #5. Cable #6 and FX #7.
I'm probably not giving enough credit to the console, cable, and FX, but with all things considered, that's where I'm putting them. I mean everything runs through the console and cable and each one can dramatically change overall "tone" (for the good or bad) and determine the overall clarity, detail. And FX can make or break a song.