Anybody can enlighten me what the pins on the input side are, especially the one marked as "SG"?
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Vacuum Tube Audio Gear
ISO single ended output transformer pin designations
ISO single ended output transformer pin designations
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SG is "screen grid", sometimes called ultralinear tap. This is only used with a pentode type tube. If you are using this with a 300B, you leave it unconnected, the B+ voltage goes to the B terminal and the P to the plate.