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Help me identify this mic

Discussion in 'Pro Audio Equipment' started by Tom Cram, Apr 23, 2001.

  1. Tom Cram

    Tom Cram Active Member

    Joined:
    Mar 5, 2001
    Location:
    salt lake city, utah
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    It's an old RCA ribbon mic. It has a square brownish/charcoalish body. The RCA logo isn't the big red round one, it's square. The ribbon inside goes over the top and down the back. It seems to be a figure eight pattern but also has three switch positions (patterns? impedance? low cut? wha?). When I switch the positions I can hear the low end getting thinner, but that could be from changing patterns or low cut. The cable is attached and the mic stand collar is directly attached to the mic. In other words, it doesn't have the U bar cradle that you see with the big cylindrical suppository shaped 77DX's or the square 44BX's. It is shaped more similarly to a 44BX, but smaller. A friend is letting me try it out (possibly buy). The only thing he knows about it is that he got it from a military guy at Los Alamos NM (where they built the bomb).

    A model number and dollar value would be very helpful.
     
  2. Tom Cram

    Tom Cram Active Member

    Joined:
    Mar 5, 2001
    Location:
    salt lake city, utah
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    I'm getting closer, it has the BK11a body style, but the RCA logo isn't the round red one, it's square.
    http://www.k-bay106.com/rca_bk11.jpg

    By the way it sounds incredible. It actually sounds better upside down for some reason, a little more zing to the high end...weird, maybe it's psychoacoustic.

    Somebody here has got to know which model it is.
     
  3. Bear's Gone Fission

    Bear's Gone Fission Active Member

    Joined:
    Jan 4, 2001
    I believe that's an insiders trick for old ribbons that have a little sag, you use gravity to take up a little slack and make it react as though it's back closer to proper tension. Could be I'm confused about this, though.

    Bear
     
  4. Tom Cram

    Tom Cram Active Member

    Joined:
    Mar 5, 2001
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    salt lake city, utah
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    Gravity? Unbelievable :eek: . I'm new to the ribbon mic thing. I've rented Royers for sessions before and loved them, but concerning the whole RCA vintage ribbon thing I'm totally clueless.

    I've noticed a pretty heavy proximity effect with this mic, is that normal? I also need to switch to super lo-z setting on my dbx786 in order to get good S/N ratio. How sensitive to SPL is an older ribbon like this?

    So many questions... :confused:
     
  5. Bear's Gone Fission

    Bear's Gone Fission Active Member

    Joined:
    Jan 4, 2001
    Well, here's the link for Stephen Sank's site, and he's the one to answer all your questions on the mic. His father designed a bunch of the RCA's and he restores and reribbons RCA's, B&O's, Beyer's and others. On r.a.p. Sank is being used as a verb to refer to his mods improving upon the Beyer's and B&O's. The Stephen Paul or ribbon mics, you might say.

    Bear
     
  6. Tom Cram

    Tom Cram Active Member

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    Mar 5, 2001
    Location:
    salt lake city, utah
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    Thanks Bear,

    Harvey Gerst also referred me to Stephen Sank on another bbs. I'll get in touch with him. My buddy is selling this mic for next to nothing. I think I may have stumbled upon one of those gear deals that you hear stories about. You know, the old military stash in some forgotten warehouse. :D
     
  7. hargerst

    hargerst Active Member

    Joined:
    Jan 28, 2001
    Originally posted by Cram:
    Thanks Bear,

    Harvey Gerst also referred me to Stephen Sank on another bbs. I'll get in touch with him. My buddy is selling this mic for next to nothing. I think I may have stumbled upon one of those gear deals that you hear stories about. You know, the old military stash in some forgotten warehouse. :D
    You did, Tom. And huge proximity effect IS normal for a bi-directional ribbon mic. That's what the 3 position switch on the back is for. 1 is full range, 2 is a rolloff starting around 300 Hz, and 3 is a steeper rolloff at about the same point. Get everyone of them that you can - they're a great mic.
     
  8. regebro

    regebro Guest

    RCA Changed their logo to a square one in the 70s or so. I would venture on a wild guess that your mic is the one you had a photo of above, but manufactured after the logo change.
     

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