Mic Hand No.13

[David Dunlop]

OK James. What you have there is a HEADGEAR, Assemblies, Cdn Type 10. They were standard issue in 1944 with the Wireless Set Cdn No. 52 but would interchange with most available 19-Sets Mk III. I am not certain if they will behave well with a 19-Set Mk II.

I pulled the element out of a working mic I have on my 19-Set Mk III. The resistance reading I get between the centre contact on the bottom of the element and the case is 41 Ohms once it settles down. If yours reads a similar, or close, value, try wiping down the lower section of the case and base terminal with alcohol and reinstall it. Connect the headgear to your 19-Set and turn it on and warm it up. Make sure you are in intercom mode and try speaking into the mic. You should be able to hear yourself in the Headgear.

David

[James D Teel II]

I’d already done everything but without knowing the resistance value I didn’t check that. I show it to be open. My “extra” voicemitter shows open as well.

[David Dunlop]

Hi again, James.

Thanks for dragging me away from my 52-Set Sender work for a while. It is at a point where I need a break.

You will need to find some replacement bits if both of yours are showing open circuit. What you are looking for is:

INSERTS, Microphone, Moving Coil, No. C1. ZA/CAN 0605

Geoff Turcott is a member of this site. Send him a Personal Message and he may be able to help you out.

David

[James D Teel II]

As always, David. Thank you for all of your help!

[David Dunlop]

One other thought on these inserts, James. You will find most of them lack the tape strip around the upper body. I have found this strip, and remnants of it, on Philco made Inserts and all of those came out of the Type 10 Headgear.

If you look at the Pressel Switch terminals inside the Mic Assembly, they sit rather close the the Inserts upper section. My thought is the tape is added to prevent the Insert from shorting the Pressel Switch, if the Insert should move for any reason.

I would suggest, to be on the safe side, add the tape strip to a new Insert, if you need to, before using it.

David

[James D Teel II]

Will do. Thanks again.