Double Checking a Power Transformer

[Dubis7]

Yes, this is a tube deck.

Originally Posted by Electronic M

Connect the heater secondary (lowest resistance)

If the lowest resistance is always for the heaters, then I know which winding my primary is. Of the two choices, I'm reasonably confident that the one with a 20 ohm resistance is my primary, especially since it's much close to the schematic resistance of 28 ohms than the 90 ohm winding.

If I'm understanding this correctly - I have two secondary windings. One has very little resistance and transmits a higher voltage to the heaters to warm the tubes. The other has a high resistance and drops the voltage significantly before it goes through the rectifier diode and grids.

Or am I completely off the mark on this?

[Electronic M]

Originally Posted by Dubis7

If I'm understanding this correctly - I have two secondary windings. One has very little resistance and transmits a higher voltage to the heaters to warm the tubes. The other has a high resistance and drops the voltage significantly before it goes through the rectifier diode and grids.

Or am I completely off the mark on this?

Yes and no.
On a transformer low resistance=low voltage/High current (high current needs thicker winding wire to not burn open...Thick wire with low turns count like a winding has low resistance), and high resistance=high voltage/low current. The B+ winding, if it produces the same voltage or higher than line, should have a higher resistance than the line winding.

If the wires still have readable color code (often they fade to beige) red is usually B+.

Do you know for a fact this transformer is correct for your deck, and if so HOW do you know it is correct for it?