I agree with Bill, unless you are tone deaf there is no magic to learning to recognize intervals by ear. It's a learned skill like anything else.
I use my iPhone to tune with the following apps:
NOTES
Which I use to reference the pitches that I generally use for each kit.
VIRTUOSO PIANO
To reference the actual pitches
Basically I have gone through all of my kits and found the lowest possible pitch that each drum will produce and then made minor tweaks until I find that drums sweet spot. After that, I then make minor adjustments so that the drums work melodically together. Typically drums will fall into intervals of a fourth or major thirds. When I note the "pitch" of the drum head, I am referring to the pitch the drum produces while sitting on a padded table so I am only really listening to one head at a time. That is not the actual pitch the drum produces.
Once I have that relationship set, I can then decide what I need from the resonant head. For maximum resonance and sustain I tune them to the same pitch. If I want to increase the "punch" from the drum I tension the bottom head up a minor third or a fourth.
Since I am constantly changing heads on my kits I have found it useful to record the "usual" pitches that I use for a particular kit. That really speeds up the process. It should be noted that occasionally a drum will not produce the tone I've noted due to the occasional inconsistency in drum heads. I am constantly tuning about as low as the drums will go as that is "all the rage" in most
contemporary music these days and some heads just don't go as low as others.
As to technique, I check and make sure the head rotates freely on the shell and then add the rim. I tension finger tight all the way around and then a quarter turn in a star pattern to keep the tension even on the hoop. I generally tension the head well above the target pitch and give it a light shove in the center with the heal of my hand to help seat the head. Once it has set for a few minutes I lower the pitch with the same 1/4 turn and take it below the target pitch. I slowly raise the head to pitch and again press in the center. As soon as the head holds tension I quit doing that and bring the head to pitch, always from lower to higher. I never tune down to pitch but always below and then back up.
That works for me, it is repeatable and I can train other to do it just the same way. There is nothing wrong at all with using some other device. As I've said before, if it works, do it. To answer your question, vintage drums can be tuned to pitches and, if the drum is in tune with it's self, it is tuned to a pitch whether you know what that pitch is or not. The reality is that there are enough overtones in a double headed drum that it is generally not perceived as a particular note. Now single headed drums....that is another story.