TRIAD 45217 Fender Tweed 28 watt Output Transformer as equipped on  high  power Fender Tweed Pro 5E5, 5E5A, and 6G5 or Tremolux 6G9 and 6G9-A or Vibrolux 6G11 or Bandmaster 6G7 and 6G7A Guitar Amps. These are really hard to come by..