Electronics > Beginners

Identify giant transformer from 1978 tape reel

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MarkF:

--- Quote from: Cubdriver on May 04, 2019, 04:54:44 am ---
--- Quote from: MarkF on May 03, 2019, 11:32:42 pm ---Getting closer.  Only missing brown wire.
https://elektrotanya.com/pioneer_rt-701_rt-707_art2540_additional.pdf/download.html#dl

   

--- End quote ---

Given that electrotanya schematic, my guess would be that the brown wire might be the 120V primary tap - check to see if it has continuity with the black, violet and grey wires.  If that is correct, the resistance between the black and grey will be highest, black and violet less, and black and brow the least of the three.

-Pat

--- End quote ---

Yes.  I totally misread the voltages on this last diagram.
I believe this is what the transformer looks like.
However, the first diagram shows the red winding as 1A and the second diagram show it as 630mA.

Checking the resistance between the four primary wires should verify this.

   

Jwillis:
That model RT-701 had several versions.

    RT-701/KU = #3603301~     (Canada/USA) 120V
    RT-701/KC = #3400001~     (Canada/USA) 120V
    RT-707/KU = #3606301~     (Canada/USA)  120V
    RT-707/KC = #3400001~     (Canada/USA) 120V
    RT-707/D  = #9301201~      (US Military) Various
    RT-707/DG = #9301001~    (General Export) various
    RT-707/HG = #8400001~    (Europe/Oceania, Scandinavia, UK)  220 - 240 V
 
This would explain the different primary configurations of the transformer.   

 The second number would be the beginning of the serial number probably on the back somewhere.

queennikki1972:
The Brown wire does in fact have continuity with violet black and gray

queennikki1972:
Brown to gray 6.8 ohms
Back to gray 10.3 0hms
Black to violet 10.3 ohms
brown to violet 5.7 ohms
brown to black 3.7 ohms

queennikki1972:
I would have thought such a huge transformer would have been more amps ?? But the voltages are very high

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