[ARC5] T-17 Microphone

Mark K3MSB mark.k3msb at gmail.com
Wed Jun 11 20:00:33 EDT 2014


Hi Ken

www.k3msb.com/temp/T17_3.jpg <http://www.k3msb.com/temp/T17_2.jpg>

The back of the mic is marked "Microphone T-17 14684 Phila-44"

Mark K3MSB


On Wed, Jun 11, 2014 at 7:24 PM, Kenneth G. Gordon <kgordon2006 at frontier.com
> wrote:

> On 11 Jun 2014 at 17:56, Mark K3MSB wrote:
>
> > Here's 2 photos the the matching transformer.
> >
> > www.k3msb.com/temp/T17_1.jpg
> > www.k3msb.com/temp/T17_2.jpg
> >
> > It looked original form the way it was wrapped etc, but I've not seen the
> > guts of a T-17 before.
> >
> > 73 Mark K3MSB
>
> Mark: that transformer is not WWII vintage: I recognize it. It is one that
> was
> available from Radio Shack up until quite recently. I cannot remember the
> impedances, but I THINK it was from 1K CT to 8 ohms.
>
> I have used those transformers as "high impedance" to 8 ohm transformers.
> They work fairly well for that.
>
> For one thing, the mounting tab on the end that can be seen has been
> "scrunched". If you opened that up, you would see what I mean.
>
> Secondly, from the bare shape of the "box" that is holding the mic element,
> that does not look, to me, like a T-17. That "box" appears to be
> "tear-drop"
> shaped, whereas, as I remember it, the element box on a T-17 was round.
>
> If you could post photos of the complete mic we could give you more
> accurate
> advice.
>
> BTW, good job on your setup. It is beautiful. How is the transmitted CW
> quality? Chirp gone now?
>
> Ken W7EKB
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