Sigma (Utah Scientific) TSG 490 Sync Test Pattern Generator with AES Audio

Sigma Electronics TSG-440 - Test & Sync Generator + Power Cord - Tested!

Sigma TYC-26 Signal Generator

Snell & Wilcox HD High Definition Test Pattern Generator

Sigma STS BSG-26N Black Signal Generator

Sigma STS BSG-26A REFERENCE COMPOSITE BLACK SIGNAL GENERATOR

Sigma STS BSG-26A Reference Composite Black Signal Generator

old bbc / tv studio test trigger, waveform generator and sequencer