Hello Bora,
the historic stock V72 is not the greatest choice for a ribbon mic due to its 34dB (EMI/Carl Lindstroem versions 40dB)of gain.
As Ryan pointed out the historic stock V77 is better, but the historic V76 works best.
Regarding noise, a proper rebuild and modified historic V72 gives you about 60dB of gain, with a self noise of approx. -88dB weighted, that translate to approx. -110dB noise at max. gain.
Please take a look at the historic specification (see attached pic) with AC heating, if you heat the filament with DC you get a signal to noise ratio that touches the physical limits.
A proper rebuild V76 has a self noise of - 120dB AC or DC heating.
Putting this in proper perspective, most historic American mic pres in the same league than the V72, RCA, Westrex, etc; the best of them has a self noise of -60dB....
The best A/D converter today is approx. -75 dB (last time I checked company specs..)
I can not talk about the M72, it might be just an V72 inspired unit, but if this units is noisy you want to check the self noise, and make sure there is nothing wrong with it... If it is a V72 type pre, the noise specs should apply too.
Regarding historic V7x units, if your Telefunken V72 is noisy it probably reminds you that it is in desperate need of service..
From the statistic, 90% of all units that were send to me last year did not even meet the historic specs. just passing signal.
Biggest problem, 48V use/damage (see 48 volt info)
http://recforums.prosoundweb.com/index.php/t/3244/1288/?SQ=1 ea6ac25558ae22943a72e719101fbde
2nd problem, over heating of the filaments due to wrong mains 230V/240V vs. 220V or wrong improper step up x-former, that will fry your tubes and power x-former.
I ripped out step ups with mains as high as 250V out of home made and so called professional racks...
3rd problem, improper removal and/or modification on cost of S/N ratio as well as sound.
4th problem wrong tubes to save some money other tubes than the EF804/806s tubes were installed.
Hope that answers your question.
Your info indicates that you are located in europe, if you need a good V tech, I can give you some suggestion via PM.