Zebra_PD

UTC H-9986 values?
« on: October 09, 2019, 01:16:52 PM »
Hi!

Got a couple of mystery UTC irons for cheap when I bought some other parts from a seller on ebay. Played less then 5$ each.

Trying to figure out the specs of these but get a bit confused looking at the specs written on them. Perhaps someone can help me out and/or guide me through how to measure them.

My best guess is that they are 1:1 600:600 ohms but that part with the splits and +9 DPM makes me wonder if they might have another ratio?

"The looks is half the sound"
----------------------------------------------------------
My company:
www.zebrastudios.se


Zebra_PD

Re: UTC H-9986 values?
« Reply #1 on: October 09, 2019, 02:24:57 PM »
Second picture
"The looks is half the sound"
----------------------------------------------------------
My company:
www.zebrastudios.se

Re: UTC H-9986 values?
« Reply #2 on: October 09, 2019, 04:56:08 PM »
Two primary coils ,tabs 2&3 should be joined for 600ohm ,1+3 ,2+4 for step up
Center tapped secondary , 100-3500(HZ) relates to working frequency  ,
+9dbm is max level .
If you have an audio interface with balanced in and out you could hook the transformer in and see how it looks in a program like REW .

EmRR

Re: UTC H-9986 values?
« Reply #3 on: October 09, 2019, 05:04:29 PM »
Pair of 250Ω resistors in series to the primary side taps and a 620Ω resistor across the output taps will show you what it actually does in a true 600Ω environment, at least close enough.  Compare to modern bridging response with 50-200Ω source drive and 10KΩ load to see the range of environmental effects. 
Best,

Doug Williams
Electromagnetic Radiation Recorders

"I think this can be better. Some kind of control that's intuitive, not complicated like a single knob" - Crusty

"Back when everything sounde

Zebra_PD

Re: UTC H-9986 values? New
« Reply #4 on: October 10, 2019, 07:06:50 AM »
Thx for the reply and the tip on REW software and a interface! Guess using that software I could make out the ratio?

So you guys think it could be wired as an step up transformer?

In that case perhaps could it be used in a PM670 build as an input iron?
« Last Edit: October 10, 2019, 07:31:51 AM by Zebra_PD »
"The looks is half the sound"
----------------------------------------------------------
My company:
www.zebrastudios.se


 

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