vid
Headphoneus Supremus
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I have a pair of Realistic Pro 50 headphones and it looks as though they are relabeled AKG headphones. They have 6 passive diaphragms inside of each earcup surrounding a transducer in the center. Do you have any more information about these headphones?
The model sold as the Realistic Pro 50 was our original model K250. Not much is known except that it was similar in construction and performance to our K240, of which there have been several versions since the late 1970s including the current K240 Studio.
Technical Services Rep.
AKG, USA
There's some interesting information posted here, thanks all!
tyre, that K 250 service doc looks interesting; it's very strange that they haven't added it to the AKG product archive. There are two possible things the AKG rep may have meant by "original model K 250" I think. He could either be implying that there's an earlier K 250, or he was making a clear distinction between AKG's own (original) model and the one made for RadioShack. His wording is very ambigous, though. There are magazine ads (here, for instance) that seem to place the Realistic Pro 50's introduction to late 1979 – so an earlier K 250 would then have had to have been from the late 70s. If you could upload the service doc PDF somewhere so that the part names would be visible, that would be much appreciated (if you don't have a space for it, drop me a PM and I can upload it to mine). (I don't mean to imply that you or anyone else has intentionally misled people – although I do feel that the image of the Pro 50 baffle that you posted [here] could do without the number 250 in its filename. To be honest, the AKG rep was misleading you, if anything).
Deep Funk, I bought the Philips version of the K 260 some while ago, so maybe I can do some comparison between that and the K 250.
zeno, in the context of your prototype theory, would the fact that the K 250 contains no trace of the AKG logo mean anything? Since tyre's service doc has the date 1981, and if the K 240 Monitor/DF indeed spelled doom on the K 250, then maybe the early 1980s (and maybe the late 1970s?) were when the K 250 was around.
I'll update my first post with the K 250 service doc information later today.
Which AKG models didn't have the AKG logo on them? (I don't doubt you, I'm interested.) It's definitely very adventurous of AKG to drop their logo from the K 250 considering that all their other models at that time seem to have come with one. Although, as Fitz has said, AKG was very adventurous.
When I saw that the K 250 had no AKG logo on it anywhere, I suspected that it may have been due to the K 250 having been meant as a specialty phone of some sort (kinda like this K 141) for whatever context where a logo wasn't desired. I couldn't think of any such context, though. And, of course, the headband has "AKG" written on it with massive letters even if there is no logo as such.
The thing about the K 250's design that irks me is that the rectangular side panels (are those called sliders or what?) stand out too much. They look oversized – they look too much like they were simply taken off a K 340 and put on the K 250. On the K 340 the shape flows around the cups, but on the K 250 it connects to nothing. This, of course, is just subjective opinion on my part, and I don't know much about Scandinavian design.
Regarding the K 250 service manual, how reliable is the date on that exactly? I quickly looked up the service doc for the K 260, which had a date of 1993 on it – even though, according to http://20cheaddatebase.web.fc2.com/AKG/AKGindex.html, the K 260 were discontinued in 1989. So either that manual was updated years after the K 260 had been discontinued (possible, to reflect part availability or whatever), or that website isn't too reliable.