Push-pull tube amplifier output transformers.
1W to 25W push-pull tube amplifier output transformers with a frequency range of 70 to 18K Hz.
10W or 15W push-pull tube amplifier output transformers with a full frequency range of 40 to 18K Hz.
25W to 100W push-pull tube amplifier output transformers with a full frequency range of 20 to 20K Hz.