Miscellaneous Documentation

• Bernards Radio Manual No. 135: All Dry Battery Portable Construction
• Xicon IFT Transformers
• RS Universal Output Transformer
• OEP PT4 Pulse Transformer
• LT700 Output Transformer
• Radiospares Audio and IF Transformers (1967)
• Denco Technical Bulletin DTB4
• Eddystone Catalogue 1935
• Repanco Catalogue 1960
• Unilab System Alpha
• Spark Length