• WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
    Building, troubleshooting and testing of these amplifiers should only be
    performed by someone who is thoroughly familiar with
    the safety precautions around high voltages.

How to wiring the transformer

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The turn ratio will give you the answer.

40:4:1

x2 = 80:8:2
x3 = 120:12:3
...
x6 = 240:24:6

So, if your input Voltage is 120Vac (connected to pin 1&2) then you will get 12Vac on pin 4&5, and 3Vac at pin 6&7

If your input Vac is 240Vac(connect pin 1&2) and then you will get 24Vac on pin 4&5, and 6Vac at pin 6&7

If you use Pin1&3 turn ratio should be 185:4:2
 
From the picture;

The ratio is 40:4:1
40 is for pin 1&2, 4 is for pin 4&5 and 1 is for pin6&7

At the working voltages
Pin1&2 is 78v, Pin 1,2&3 is 370v.

Because of some winding resistance the voltage will drop a bit from 80v to 78v. So, the ratio is (78:7.8:2 ) / 2 = 39:3.9:1
This is almost same as the given ratio 40:4:1

If you connect to pin 1&3, it will become 370v:7.8:2. After divided by 2 = 185:3.9:1

To make it easier to read, It will be 185:4:1
 
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