valco

Airpax / Stancor Military grade transformers
« on: May 17, 2020, 03:39:03 PM »
Hi !

I recently got my hands on a bunch of these Airpax transformers from an old storage of surplus equipment from the army , but I haven´t been able to figure out what kind of transformer this is yet.  Is it a microphone transformer or something for some sort of radio equipment?

The transformers are labeled with Airpax AT- 601 821616 and a few that are similar and with similar numbering are named Stancor. They are also 8 pin

I´ve found these pages that i think is describing the transformer , but i can´t figure out what they are for and what the input ohm are and what the pin out are.

https://www.asap-distribution.com/nsn/nsn-parts/5950006923126/

https://www.asap-distribution.com/nsn/rfq/unisys-corp/5950006923126/821616/

https://www.parttarget.com/5950-00-692-3126_5950006923126_821616.html/-FD7C07EC-0909-4D98-A5F4-6F221325C10B

Does anyone have knowledge of these kind of transformers ?

Thanks


valco

Re: Airpax / Stancor Military grade transformers
« Reply #1 on: May 17, 2020, 03:39:50 PM »
Stancore

valco

Re: Airpax / Stancor Military grade transformers
« Reply #2 on: May 17, 2020, 03:40:29 PM »
Pin out

squarewave

Re: Airpax / Stancor Military grade transformers
« Reply #3 on: May 17, 2020, 05:27:08 PM »
Measure DC resistance between each pins and find the ones that have continuity. That will tell you which are windings and which are just shields or the case or whatever. Once you identify the windings, put some AC in and see what you get out. Measuring impedance is a little harder but with DCR and a list of windings you can probably get some idea as to what they are.

valco

Re: Airpax / Stancor Military grade transformers
« Reply #4 on: May 19, 2020, 11:54:02 AM »
I sent signal thru on pin 1 and 2 and got them in return on 8 and 7 . Did the same on 3 +4 and got them out on 5 and 6 .
Then i sent a signal that measured 0,025 vac and got it out on the other side 0,065 vac , so if my calculations are right its a 1:3 transformer.


valco

Re: Airpax / Stancor Military grade transformers
« Reply #5 on: May 19, 2020, 12:00:10 PM »
Can they be used as microphone transformers ? or is the ratio too low ?

ruffrecords

Re: Airpax / Stancor Military grade transformers
« Reply #6 on: May 19, 2020, 02:00:03 PM »
Can they be used as microphone transformers ? or is the ratio too low ?
1:3 is fine for a semiconductor mic pre but too low for a tube one.

Cheers

Ian
www.customtubeconsoles.com
https://mark3vtm.blogspot.co.uk/
www.eztubemixer.blogspot.co.uk


'The only people not making mistakes are the people doing nothing'

valco

Re: Airpax / Stancor Military grade transformers
« Reply #7 on: May 19, 2020, 04:18:52 PM »
Do you mean a electret mic ? I´ve never heard of a semiconductor mic

scott2000

Re: Airpax / Stancor Military grade transformers
« Reply #8 on: May 19, 2020, 04:34:45 PM »
Do you mean a electret mic ? I´ve never heard of a semiconductor mic

Mic Pre

squarewave

Re: Airpax / Stancor Military grade transformers
« Reply #9 on: May 19, 2020, 04:54:56 PM »
Those could just be different taps. You need to start with basic contitunity measurements using a digital multi-meter. Draw a picture with DC resistance between each pin and post it.


valco

Re: Airpax / Stancor Military grade transformers
« Reply #10 on: May 20, 2020, 05:36:08 AM »
Mic Pre

My bad. I totally misread it.


 

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