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This is for a pair of Pioneer AT6123 audio output transformers for push pull 7189-A, EL84, or 6BQ5 tubes. They came from an SX-82 receiver, but are also used in many other 1960's Pioneer receivers and amplifiers. They have taps for 4, 8, and 16 ohm speakers. The SX-82 is rated for 28 Watts per channel RMS. They weigh approximately 2.5 lbs each.
The connections are:
white: speaker ground
blue: 4 ohm
purple 8 ohm
yellow: 16 ohm
red and green : output tube plates
orange : B+