Hello . I have one question just get out of my head … I’m order main transformer for my new tube amp . The transformer have 2 currents . 1 for circuit ( 220vac+220vac , that is 2 wires with 220 vac and 1 wire as a tap/ground ) ….and the current for filament it must be 6.3vac c.t. … my question is : the voltage on wire must be
- 1 wire with 6.3vac and 1 wire with 0vac ?
- 2 wires with 3.15vac and 1 wire as a tap/ ground ?
- 2 wires with 6.3vac ?
I know is stupid question . Is the second but I have to be sure. ��
- 1 wire with 6.3vac and 1 wire with 0vac ?
- 2 wires with 3.15vac and 1 wire as a tap/ ground ?
- 2 wires with 6.3vac ?
I know is stupid question . Is the second but I have to be sure. ��
Last edited:
Not at all stupid. Many are confused about this, and it is perceptive to realize that it is not clear.
Voltages are only relative, and are measured between two points (or wires).
For example, the black/negative/common/ground meter lead can be the reference (0V),
and the other voltage be measured relative to it, with the red meter lead.
If a winding is not otherwise connected to anything, you are free to arbitrarily define
one of the leads as 0V and measure the other voltage relative to it.
If your secondary winding has a center tap, then the other two voltages are measured relative
to that 0V center wire, and are always equal (but opposite in phase, which is actually polarity).
For the 6.3V center tap winding, connect the black lead to the center. Either of the
other leads will read 6.3V/2 = 3.15V relative to it. However, if you looked at them
with an oscilloscope, each would be in the opposite polarity of the other.
A meter only reads the magnitude of an AC voltage. It can only read polarity for DC, not AC.
Transformers are labeled in a variety of ways, and this is often confusing to many.
All of the descriptions you list have been used, and are all equivalent.
Voltages are only relative, and are measured between two points (or wires).
For example, the black/negative/common/ground meter lead can be the reference (0V),
and the other voltage be measured relative to it, with the red meter lead.
If a winding is not otherwise connected to anything, you are free to arbitrarily define
one of the leads as 0V and measure the other voltage relative to it.
If your secondary winding has a center tap, then the other two voltages are measured relative
to that 0V center wire, and are always equal (but opposite in phase, which is actually polarity).
For the 6.3V center tap winding, connect the black lead to the center. Either of the
other leads will read 6.3V/2 = 3.15V relative to it. However, if you looked at them
with an oscilloscope, each would be in the opposite polarity of the other.
A meter only reads the magnitude of an AC voltage. It can only read polarity for DC, not AC.
Transformers are labeled in a variety of ways, and this is often confusing to many.
All of the descriptions you list have been used, and are all equivalent.
Last edited: