"Can I record more than one track at a time if I use an A/D converter into my digital input on my 1680."
With an outboard 2-ch. or more A/D converter, you can record up to 2 tracks at one time into the digital inputs of your 1680; as I believe a stereo digital input is the maximum the 1680 has. As for whether or not the analog inputs (the inputs with an internal A/D conveter) can be used at the same time as the digital inputs, (so that you can record more than 2 tracks at a time when also using the stereo digital inputs), I don't know. I've never owned a 1680. But, I'd suspect you could use up to 6 analog inputs at the same time as the digital inputs because the inputs may have to be manuallly routed internally to tracks (maybe). But, I'd imagine the manual would tell you.
"Aren't all mic cables balanced!?!"
No. Some cables advertised a "microphone cable" are simply Female XLR-to-Male 1/4" TS (Tip-Sleeve).
"Back to the first question, Is it nessesary to drop a grand on an A/D converter. I do need it to be open for a good deal of multitracking when I find my way into protools and external mixing boards and the lot. I have not doubt that A/D can keep track of seperate tracks and split them up in the roland, but can they?"
I'm not sure I follow your question. But as a note, a good high-quality 2-ch. A/D converter (such as the Lucid 9624) will still be very useful and a "very good idea" even when you get into using Protools.
"But I was looking and notice that the TB10 was almost more suited to me. Two mic Pres with 1/4" inputs and XLR. For 950. The TB6 is 1000."
Read the descriptions of the TB-6 and TB-10 and see what the difference is. No doubt, the TB-6 will be a better buy for most people. By the way, it appeares the TB-10 is actually $45 more expensive than the TB-6.
"The question about wanting to try it first...He could have simply said -
We custom build and dont have extra units, they are not available in stores."
No doubt it'd be nice if he could just say that and leave it at that! BUT, unfortunantely, there are the few "naysayers", as he calls them, who have NEVER seen or heard a DaviSound product and simply won't except that or leave it at that. They go-on about why won't DaviSound send any of their gear to "reviewers"? What are they afraid of? What are they hiding? Hence the need for all the extra "crap" so to speak. I remember when the website didn't have all that. But, it was put in there as to reduce those types of emails. Although, I have to say, those people probably refuse to read the website anyhow! BUT, I was the one to request this part as it's such a GREAT "Oh So True" story!:
http://www.davisound.com/NewsArchives.html#NAY
"But I still want to hear one!"
Cool... Whelp, I told you how that was possible...
"As for tubes...Obviously.....a cheap tube is not as good as an expensive one,"
That may or may not be true, but I guarantee the differences in cuircut design and build quality is going to FAR exceed the differences in the quality of tubes used; when it comes to what actually comes out of the Output of the unit. That's NOT to say that tube selection is any less important, but you'd be amazed how much new crap is out there now days which incorporate the use of a voltage starved tube in its circuit simply because the marketing department ("team") said it must! You know, there's some AMAZING engineers out there in these big companys designing this crap! It's not the engineer's fault. Quite frankly, it's not the big corporation's fault. It's our fault! Making crap for cheap is where the money is at right now because that's what's in demand! So, they're providing that!
"but the most expensive solid state guitar amp in the WORLD! can NOT compete with a GOOD tube amp."
This may or may not be true when it comes to guitar amps (I'm not much into that aspect of it all), but I have a feeling you'd be surprised. However, your statement certainly DOESN'T apply when it comes to music recording pro audio gear! You'd be extremely hard-pressed to find any engineer who would tell you a Neve or API (just 2 examples) does not compete with a good tube preamp. And that applies A LOT further than microphone preamps! It's an "apples/oranges thing". No more, no less. It's a very universal view.
"If one were to want to hear a GOOD tube preamp, what would be a good model to check out."
Manley Labs' preamps are top-notch. D.W. Fearn's preamp is absolutely superb. The DaviSound TB-1 has an extremely great character. A well maintained old Telefunken/ TAB V-72 or V-76 (or a new TAB-Funkenwerk V72) is highly regarded. A Groove Tubes Viper will kick your ass. These companies are prime examples of the smaller (some VERY small), tightly knit manufacturers who design and build high-quality gear without compromise (no man upstairs crunching numbers) and that simple fact is probably one of the main reasons why they're able to keep alive!
None "better" than the other. Simply "different". Somtimes, MAY be or probably "better suited" for "this or that" or coupled with "this or that" in THIS particular case! As the more we use and get use to a piece of gear, the better we're able to predict the outcome for the particular situation.