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Joe Kramer
Guest
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 Posted:
Sun Nov 06, 2005 5:08 am Post subject:
RCA SK-45 Mic Impedance? |
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Hi Friends,
This mic is factory set for unbalanced high impedance, according to a
sticker inside the body. The documentation says it can be modfied for
low impedance though it does not say how to do it. There is a
transformer in the mic-head with a green and a black output wire, the
green originally to hot, and the black to ground. I tried attaching the
green to pin 2/black to pin 3 into low imp input, but this resulted in a
duller sound than the unbalanced config to a high imp input.
Documentation here:
http://www.thuntek.net/~bk11/1955cat19.GIF
http://www.thuntek.net/~bk11/1955cat20.GIF
Any info or suggestions on how to set this mic for balanced low
impedance much appreciated.
Regards,
Joe
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Mike Cleaver
Guest
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| Posted:
Sun Nov 06, 2005 5:42 am Post subject:
Re: RCA SK-45 Mic Impedance? |
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Go here: http://www.k-bay106.com/mics.htm
On Sat, 05 Nov 2005 23:08:13 GMT, Joe Kramer <musetrap@earthlink.net>
wrote:
| Quote: | Hi Friends,
This mic is factory set for unbalanced high impedance, according to a
sticker inside the body. The documentation says it can be modfied for
low impedance though it does not say how to do it. There is a
transformer in the mic-head with a green and a black output wire, the
green originally to hot, and the black to ground. I tried attaching the
green to pin 2/black to pin 3 into low imp input, but this resulted in a
duller sound than the unbalanced config to a high imp input.
Documentation here:
http://www.thuntek.net/~bk11/1955cat19.GIF
http://www.thuntek.net/~bk11/1955cat20.GIF
Any info or suggestions on how to set this mic for balanced low
impedance much appreciated.
Regards,
Joe
|
Mike Cleaver Broadcast Services
Voice-overs, Newscaster, Engineering and Consulting
Vancouver, BC, Canada
radiovoiceone@hotmail.com |
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SSJVCmag
Guest
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| Posted:
Mon Nov 07, 2005 5:42 am Post subject:
Re: RCA SK-45 Mic Impedance? |
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What weird little mic!
A ribbon without a ribbon...
Or is it A dynamic without a voice-coil?
Are there many of these out there? It certainly doesn't LOOK like it was
really workable as much more than a booth talkback mic.
It's not anything like the SK-46.
On 11/5/05 6:08 PM, in article
xXabf.344$Xo.279@newsread2.news.pas.earthlink.net, "Joe Kramer"
<musetrap@earthlink.net> wrote:
| Quote: | Hi Friends,
This mic is factory set for unbalanced high impedance, according to a
sticker inside the body. The documentation says it can be modfied for
low impedance though it does not say how to do it. There is a
transformer in the mic-head with a green and a black output wire, the
green originally to hot, and the black to ground. I tried attaching the
green to pin 2/black to pin 3 into low imp input, but this resulted in a
duller sound than the unbalanced config to a high imp input.
Documentation here:
http://www.thuntek.net/~bk11/1955cat19.GIF
http://www.thuntek.net/~bk11/1955cat20.GIF |
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Joe Kramer
Guest
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| Posted:
Tue Nov 08, 2005 12:40 am Post subject:
Re: RCA SK-45 Mic Impedance? |
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Bob Cain wrote:
| Quote: | Joe Kramer wrote:
Yup, it's weird--there's an oval-shaped magnet surrounding an
oval-shaped diaphragm with a wire embedded right down the middle.
How's the diaphragm suspended?
Bob
|
The edges are more-or-less sandwiched between the surrounding metal
frame. It's essentially suspended the same way as a dynamic mic
diaphragm, but it's an elongated oval instead of round. Looking at the
grill, the diaphragm takes up the top 2/3 of its length inside, and the
transformer takes up the remaiming 1/3, sitting just underneath the
diaphragm. I was mistaken before to say the magnet surrounds the
diaphragm; its apparently behind the diaphragm somewhere. The metal
frame surrounding the diaphragm is only very weakly magnetic.
Joe |
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Bob Cain
Guest
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| Posted:
Tue Nov 08, 2005 1:26 am Post subject:
Re: RCA SK-45 Mic Impedance? |
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Joe Kramer wrote:
| Quote: | The edges are more-or-less sandwiched between the surrounding metal
frame. It's essentially suspended the same way as a dynamic mic
diaphragm, but it's an elongated oval instead of round. Looking at the
grill, the diaphragm takes up the top 2/3 of its length inside, and the
transformer takes up the remaiming 1/3, sitting just underneath the
diaphragm. I was mistaken before to say the magnet surrounds the
diaphragm; its apparently behind the diaphragm somewhere. The metal
frame surrounding the diaphragm is only very weakly magnetic.
|
Hmm, this seems mechanically to be more of a one turn dynamic than a ribbon.
Bob
--
"Things should be described as simply as possible, but no simpler."
A. Einstein |
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Joe Kramer
Guest
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| Posted:
Tue Nov 08, 2005 5:30 am Post subject:
Re: RCA SK-45 Mic Impedance? |
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Bob Cain wrote:
| Quote: |
Joe Kramer wrote:
The edges are more-or-less sandwiched between the surrounding metal
frame. It's essentially suspended the same way as a dynamic mic
diaphragm, but it's an elongated oval instead of round. Looking at
the grill, the diaphragm takes up the top 2/3 of its length inside,
and the transformer takes up the remaiming 1/3, sitting just
underneath the diaphragm. I was mistaken before to say the magnet
surrounds the diaphragm; its apparently behind the diaphragm
somewhere. The metal frame surrounding the diaphragm is only very
weakly magnetic.
Hmm, this seems mechanically to be more of a one turn dynamic than a
ribbon.
Bob
|
That's about it--no coil, just a wire. You could almost call it a
"straight wire with gain." ;) Or maybe a ribbon mic on crutches.
Joe |
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