Electronics > Beginners
Identify giant transformer from 1978 tape reel
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MarkF:
I found a RTT-116 transformer on eBay.  It only has one primary winding.
So, we can not use it as a wire color reference.

I am beginning to think @soldar is right...
   BLK and BRN for 120V
   BLK and VLT for 220V
   BLK and GRY for 240V
6PTsocket:

--- Quote from: MarkF on May 03, 2019, 10:48:16 pm ---Close.  Hers has two extra wires (purple and black).
Maybe two primaries for 120V or 240V operation?
pg.59 says power transformer part no. RTT-115

   

   

--- End quote ---
The AC line in Japan is 100 volts so one extra primary tap might be for that. I recall Japanese hi fi equipment that had a 100 volt tap for domestic consumption

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MarkF:
Thanks. 
I thought there was another standard voltage that I've seen as selectable on some equipment.   
(i.e.  100VAC / 120VAC / 220VAC / 240VAC)
schmitt trigger:
You are correct.
100 VAC is the household voltage in Japan.
MarkF:
A little bored.  So, I thought I would summarize our findings.
It hasn't been obvious but the BLU to YEL winding could be used for another 30VAC.

   
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