Collins 75A-3 · Service Note · Power Supply & Bias Locating and Replacing C-96, the Back-Bias Bypass Capacitor The one 0.1 µF paper capacitor the factory manual shows on the schematic but never calls out in the underside photograph — and…
Collins 75A-4 Known Issues & Top Components to Replace The Seven Deadly Caps, BFO Injection Level, Detector Diode Aging & IF Transformer Core Crumbling The receiver that bridges the 51J era and the S-Line — a consolidated restoration reference with…
Crystal Filters & Mechanical Filters — A-Line Receivers, KWS-1, R-388, R-390 & R-390A Collins IF Selectivity Filter Master Reference Crystal Filters & Mechanical Filters — A-Line Receivers, KWS-1, R-388, R-390 & R-390A Comprehensive specifications, part numbers, bandwidth positions, and operational…
vk6ada.com.au • Collins Radio Black Box Series Technical Archive Collins 75A-4 Amateur ReceiverFailure Prevention Kit — Component & Modification Design A complete engineering analysis of the ten predictable 75A-4 failure modes: power supply and paper capacitor ageing, the Collins FL-10…
vk6ada.com.au • Collins Radio Black Box Series Technical Archive Collins 75A-3 Amateur ReceiverFailure Prevention Kit — Component & Modification Design A complete engineering analysis of the ten predictable 75A-3 failure modes: power supply and paper capacitor ageing, carbon composition resistor…
