Ferranti Transformer details:
AF3 Transformer (51k)
AF4 Transformer (38k)
AF5 Transformer (51k)
AF6 Transformer (35k)
AF7 Transformer (46k)
AF8 Transformer (31k)
OPM1, OPM5, OPM6, OPM8 Transformers (30k)
AF3c, AF5c, AF7c, AF5cc, OPM1c, OPM5c, OPM6c transformers (35k)
Push-Pull Advantages (40k)
B1, B2, B3, B5, B7, B8 Chokes (39k)