U-47 - STOCK VS. RE-BUILT
Actually we haven't taken my 47 down there yet. But from an audibility standpoint, the tone on the "Thriller" mic was very hyped. The typical U47 response has a bit of a midrange boost (I am trying to recall, it seems to me about 4 or 5 dB) and it also has an interesting little 'scoop' - there's an "S"Curve as I recall!
Alan Sides Microphone Cabinet CD is quite informative on this.
And, of course, after 45 or 50 years, none of the 47 sound alike!
So the variations are profound - and yes: there mic seems to be modified. It didn't look like any 47 curve that I had ever seen.
And the comment - it's hard to find a good mic expert - is so true!
Claus is the man, in my view. David Baskind another brilliant soul.
Anyway, I intend - as soon as we plot my stock 47 - to publish some curves. That being said, there is more to a mic than the frequency response. A great many elements make up "tone".
More on the subject, from people a lot more knowledgeable than myself (an end-user first and formost) should be out there on the net. I am always trying to learn more about what makes these vintage mics so amazing. The Proof is in the Tone, but the underlying science (art / alchemy) often eludes one.
Why do two Steinways - same size / same year - sound different.
Same thing is true of two U-47. But hey: viva la difference!!!
Cheers!
Larry@adkmic.com - the reluctant CEO