SE output transformers for 300B. AD1. 2A3.6B4G... tube amp. 4.5K to 8 and 16ohm | eBay
Valve Audio Transformers — Majestic Transformer Company
Transformers for Tube Amplifiers: HOW TO DESIGN, CONSTRUCT & USE POWER, OUTPUT & INTERSTAGE TRANSFORMERS AND CHOKES IN AUDIOPHILE AND GUITAR TUBE AMPLIFIERS: Popovich, Igor S.: 9780980622386: Amazon.com: Books