Wanted WTB UTC ouncer O and H (RC-25) transformers

[ach]

Updated July 12 2022 - still looking!

I am looking for any of the following UTC transformers, or their relative equivalent military variety (or from later trademarks OPT, TRW, etc.):

They would look similar to these:

Model	Primary	Secondary
O-4	15k	60k
O-5	15k	60k
O-6	15k	95k
O-7	15k	95k
O-15	10k	1M
O-17	Shield
O-18	10k/2.5k	2k/500
O-19	10k/2.5k	4k/1k
O-25	600/150	2k/500
O-26	10k	10k
O-27	10k	500/125
O-37	4k/1k	600/150
H-3	15k	60k
H-4	15k	60k
H-5	15k	95k
H-6	15k	95k
H-10	10k	1M
H-13	10k/2.5k	2k/500
H-14	10k/2.5k	4k/1k
H-15	1.5k	500
H-17	600/150	2k/500
H-18	10k	500/125

Thank you!

 

[mjrippe]

That's quite a variety of values! What are you building?

 

[ach]

That's quite a variety of values! What are you building?

Hah, yes - some are being used as input or output, mostly for instrument level signal amplifiers with relatively forgiving impedances. The circuits are mostly one-offs and quite forgiving to impedance and transformer characteristics allowing a large variability. The enclosure sizes are small, hence the ouncer and size restriction. Thanks for looking, and appreciate any leads to find these!

 

[mjrippe]

Hah, yes - some are being used as input or output, mostly for instrument level signal amplifiers with relatively forgiving impedances. The circuits are mostly one-offs and quite forgiving to impedance and transformer characteristics allowing a large variability. The enclosure sizes are small, hence the ouncer and size restriction. Thanks for looking, and appreciate any leads to find these!

I have a couple, and some other recommendations. Sending you a PM.

 

[ach]

Much appreciated @mjrippe - thanks for the additional makes and models to look out for. Still on the hunt for more from this list. Thanks again.

 

[mjrippe]

You are quite welcome...and welcome to GDIY!

 

[dmp]

I have these that I don't need:
O-8
O-11
O-14
O-25
Send a pm if you are interested

 

[ach]

Thanks kindly @dmp - unfortunately I may not have enough forum clout to send you a DM. I would certainly be interested in the UTC O-25. P.S. Your website and work is quite inspiring!

 

[mjrippe]

Thanks kindly @dmp - unfortunately I may not have enough forum clout to send you a DM. I would certainly be interested in the UTC O-25. P.S. Your website and work is quite inspiring!

Hold your cursor over the member's avatar (little picture) and a window will appear. Select "Start conversation" to send a DM.

 

[dmp]

Actually it was my fault - I was experimenting with the privacy settings a week ago and forgot to change them back. My "Start conversation" should be open to members now

 

[ach]

Thank you @dmp - the UTC O-25 arrived. Much appreciated.

I am still actively looking for any of these transformers if others have them to sell. Thanks again!

 

[ach]

Just a bump to say I am still actively looking for these transformers - thanks kindly!

 

[ach]

I hope it is okay to occasionally bump this post, I am still looking for these transformers. Thanks!

 

[Timetech]

Updated July 12 2022 - still looking!

I am looking for any of the following UTC transformers, or their relative equivalent military variety (or from later trademarks OPT, TRW, etc.):

They would look similar to these:

View attachment 82253View attachment 82254

Model	Primary	Secondary
O-4	15k	60k
O-5	15k	60k
O-6	15k	95k
O-7	15k	95k
O-15	10k	1M
O-17	Shield
O-18	10k/2.5k	2k/500
O-19	10k/2.5k	4k/1k
O-25	600/150	2k/500
O-26	10k	10k
O-27	10k	500/125
O-37	4k/1k	600/150
H-3	15k	60k
H-4	15k	60k
H-5	15k	95k
H-6	15k	95k
H-10	10k	1M
H-13	10k/2.5k	2k/500
H-14	10k/2.5k	4k/1k
H-15	1.5k	500
H-17	600/150	2k/500
H-18	10k	500/125

Thank you!

I hope it is okay to occasionally bump this post, I am still looking for these transformers. Thanks!

I have pieces UTC O26

I am located in Australia.

Cheers Bruce Maddocks

 

[rackmonkey]

I have a lot of these, probably at least one or two of 75% of what you have here. Let me take inventory and feel free to DM me.