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Mysterious UTC X-2806 / RCA 949426-2 Transformer
Mysterious UTC X-2806 / RCA 949426-2 Transformer
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Old 20th December 2007, 04:35 AM   #1
snoopyma is offline snoopyma  Hong Kong
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Default Mysterious UTC X-2806 / RCA 949426-2 Transformer

Dear all,

I have just located a big round beefy transformer (black in colour) with the following label: UTC X-2806 RCA 949426-2. It has 10 wiring taps at the bottom.

Despite my efforts in googling and searching thru' the UTC catalog, I can find no information about this. It appears that it is a UTC transformer specially made for RCA.

Any clues? Thanks for any information.

Best Regards,
TC MA
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Old 20th December 2007, 05:18 AM   #2
Wavebourn is offline Wavebourn  United States
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Mysterious UTC X-2806 / RCA 949426-2 Transformer
1. measure DC resistances to figure out windings.
2. connect a sine wave generator through a 560 Ohm resistor to the winding with higher resistance and check what is going on on different frequencies.

First of all, do step #1 and report what you've measured.
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Old 20th December 2007, 11:46 PM   #3
snoopyma is offline snoopyma  Hong Kong
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Default Re: Mysterious UTC X-2806 / RCA 949426-2 Transformer

Sorry, it should be 8 wiring taps instead.


Quote:
Originally posted by snoopyma
Dear all,

I have just located a big round beefy transformer (black in colour) with the following label: UTC X-2806 RCA 949426-2. It has 10 wiring taps at the bottom.

Despite my efforts in googling and searching thru' the UTC catalog, I can find no information about this. It appears that it is a UTC transformer specially made for RCA.

Any clues? Thanks for any information.

Best Regards,
TC MA
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Old 20th December 2007, 11:49 PM   #4
snoopyma is offline snoopyma  Hong Kong
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Join Date: Dec 2003
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Quote:
Originally posted by Wavebourn
1. measure DC resistances to figure out windings.
2. connect a sine wave generator through a 560 Ohm resistor to the winding with higher resistance and check what is going on on different frequencies.

First of all, do step #1 and report what you've measured.

Hi Wavebourn,

Thank you for your advice.

The DCR values of the 8 taps are:

1-2 5.6 ohm
3-4 0.1 ohm
3-5 0.2 ohm
4-5 0.1 ohm
6-7 0.2 ohm
6-8 0.4 ohm
7-8 0.2 ohm

Regards,
TC MA
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Old 21st December 2007, 12:05 AM   #5
Wavebourn is offline Wavebourn  United States
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Mysterious UTC X-2806 / RCA 949426-2 Transformer
Looks like a line to speaker (or filament?) transformer.
Can you connect now a sine wave generator to the primary (1-2) and check a frequency response?
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