MS Vienna said:
Regarding the suffix letters on AKG models:
As In76d said
"C" is the small DIN connector (aka "Kleintuchel"),
"E" is XLR,
"L" is LEMO.
This is only true with some AKG models(e.g. C451) and cannot be generalized. I repeat, concerning D24, the "B" meant the DIN-connector, although it mostly was left out(see the attachement!).
And then the D19. Originally the suffixes "B, C" referred to different models approx. up to sn. 50 000, which both had the DIN-connector. The "E" came later and was also referring to another model, but later came to denote the XLR connector too. I am just mentioning the main lines(there were many exceptions and overlappings later). From my several years of involvement in repairing these mics, I can gather the following. There were three different capsules: B, C and the one used in D24. D19E(long body, o-trafo)and D119models came later and used the same capsule as theD24. B and C capsule top-plates were with two screws and the D24 with three screws. B-capsule had a stiffer blue diaphragm and C and D24 had the same softer diaphragm, that was transparent and the form was also differing from that of D19B. The three capsules were also differend inside, I do not wish to go to details , unless desired. The B-type capsule was only made up to sn. 50 000 and after that on the D19B was using the same capsule as the D19C, but the blue diaphragm remained.
AKG D19C remained the same, but in general the OEM D19B and D19C were getting the same capsule, this time all with the blue diaphragm. I have seen more than ten OEM D19:s (Telefunken, Norelco, Uher, Revox, Grundig, Graetz etc...). However, when these mics were repaired by AKG, they got whatever was around and overlappings and confusion is mostly due to that.
MS Vienna said:
If there´s a "B" it means "Bassabschwächer" (switchable bass rolloff), i.e. C451E vs. C451EB
That was somewhat inconsistent too. I.e. the two way mics don´t have the B despite their low cut switch.
Yes, very inconsistent. Take AKG D20, that originally was without the bass-attennuator. Then with the attennuator it became D20B, but since all models afterwards were with the attenuator, the B was left out I guess.