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Hi
I found some old transformer which har the following primary winding interface:5V o--o
0V o--o
100V o--o
110V o--o
120V o--o
SER/PARAs beeing from EU (240Vac) IŽll use the 0V and 120V tap and put a jumper between 0V and 120V for seriell primary winding.
But, whats the 5V tap used for ?
Follow Ups:
I would interpret this as an additional tap to let you get 105, 115, 125V, 210, 230, 250 primary voltages - if it has continuity to the others, that's probably what it is. It could also be a 5V isolated secondary winding that just happens to be placed next to the primary.
Yes, the 5V tapp is in series with the primary winding, so it must be a "adjustment" tap to get:
100V
105V
110V
115V
120V
125VAnd the 2'nd multipple of the primary voltage above
That tap might be for a 5 volt filament winding, depends upon the current draw rating, hopefully on the label with the voltages. The usual need was to supply heater current and voltage for a rectifier tube, but that takes 3 amps for just one tube. Many of the 5 volt signal tubes take quite a bit less than this 3 amps.
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