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 he

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

Go he http://www.k-bay106.com/mics.htm

On Sat, 05 Nov 2005 23:08:13 GMT, Joe Kramer
wrote:

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 he

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

"Joe Kramer"
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.


** The other (ie input ) connections to the transformer are the ones to
use.

The transformer can be dispensed with for Low Z use.



.......... Phil

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
, "Joe Kramer"
wrote:

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 he

http://www.thuntek.net/~bk11/1955cat19.GIF

http://www.thuntek.net/~bk11/1955cat20.GIF

Yup, it's weird--there's an oval-shaped magnet surrounding an
oval-shaped diaphragm with a wire embedded right down the middle. Each
end of the wire is connected to the transformer. It's an almost-ribbon,
or a not-quite dynamic. Nicely voiced on a guitar amp. Haven't tried
it on vocals yet, but it's not as boxy as the frequency specs would lead
you to think.

BTW, thanks for the link Mike--I've now learned that mine is actually a
KN-1B, same element but different body, FIXED at high impedance. The
KN-1A is fixed at low impedance

Joe


SSJVCmag wrote:
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
, "Joe Kramer"
wrote:


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 he

http://www.thuntek.net/~bk11/1955cat19.GIF

http://www.thuntek.net/~bk11/1955cat20.GIF

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
--

"Things should be described as simply as possible, but no simpler."

A. Einstein

Bob Cain wrote:

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

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
--

"Things should be described as simply as possible, but no simpler."

A. Einstein

Bob Cain wrote:


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

Joe Kramer wrote:

BTW, thanks for the link Mike--I've now learned that mine is actually a
KN-1B, same element but different body, FIXED at high impedance. The
KN-1A is fixed at low impedance

Right. I would bet that you could replace the transformer with the Lundahl
1:37 ribbon mike transformer if you want a low-Z output.

As it is, you can rewire this mike for a high-Z balanced output, which
might be okay into a lot of preamps. You can also add an additional
step-down transformer after it (although you are still then fighting
the top end loss from distributed capacitance in the secondary of the
RCA transformer), and get a low-Z balanced out.

But I'd bet that if you actually wanted to use the mike that the Lundahl
would be an improvement. On the other hand, it would probably devalue
the mike for a collector.
--scott

--
"C'est un Nagra. C'est suisse, et tres, tres precis."