Stancor Universal Single End or Push-Pull Audio Output Transformer PT-291 for Vintage Amateur Radio Gear NOS

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Description

Stancor Universal Single End or Push-Pull Audio Output Transformer PT-291 for Vintage Amateur Radio Gear NOS

Characteristics

Design: Universal / multi-tap push-pull (PP) output transformer for tube audio equipment (Vintage Amateur & Communications radios, small amps, hi-fi, or guitar amps).
Impedance Taps (on the secondary): Marked for 1 Ω, 1.5 Ω, 2 Ω, 4 Ω, and 8 Ω speaker loads, with support for both single-ended and push-pull configurations. This versatility makes it a "universal replacement" part.
Wire Colors (please check the enclosed sheet:
- One side (likely primary/high-impedance side): Green, Black, Green — common for push-pull primaries (e.g., plate 1, center-tap/B+, plate 2).
- Other side (secondary/low-impedance): Brown, Red, Blue — these typically connect to the various speaker taps (common + different ohm selections).