r-390a.net • The Definitive R-390A/URR Community Reference Collins R-390A/URRTen Most Common Failures — Ranked by Community Report Frequency A data-driven ranking of the ten failure modes reported most frequently across 27 years of R-390A community documentation: the R-390 Reflector archive,…
vk6ada.com.au • Vintage Receiver Fault Diagnosis Series Heathkit HW-16 CW TransceiverAudio Hum Fault Diagnosis — AF Gain Wiring, Grid Circuit, and Scope Validation Root cause analysis of a volume-control-independent audio hum. Kelley W0RK’s grid-grounding test identifies the most probable injection…
vk6ada.com.au • Collins Radio Black Box Series Technical Archive Collins KWS-1 Kilowatt Sideband TransmitterFailure Prevention Kit — Component & Modification Design A complete engineering analysis of the ten predictable KWS-1 failure modes: HV power supply electrolytic capacitors at ~2000–2500 V DC,…
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…
vk6ada.com.au • Collins Radio Black Box Series Technical Archive Collins 75A-2 Amateur ReceiverFailure Prevention Kit — Component & Modification Design A complete engineering analysis of the ten predictable 75A-2 failure modes: electrolytic and paper capacitor ageing, drifted carbon composition resistors…
vk6ada.com.au • Collins Radio 75A-Series Technical Archive Collins 75A-1 ReceiverFailure Prevention Kit — Component & Modification Design A complete engineering analysis of the ten predictable 75A-1 failure modes: leaking oil-filled bathtub capacitors, lethal B+ at the muting terminal on early…
vk6ada.com.au • Collins Radio KWM-380 Technical Archive Collins KWM-380 TransceiverFailure Prevention Kit — Component & Modification Design A complete engineering analysis of the ten predictable KWM-380 failure modes: optical encoder degradation, PA oscillations, front-end diode damage from T/R transients, frequency…
vk6ada.com.au • Collins Radio KWM Series Technical Archive Collins KWM-1 TransceiverFailure Prevention Kit — Component & Modification Design A complete engineering analysis of the ten predictable KWM-1 failure modes spanning the 1N67 germanium balanced modulator diodes, Collins 455 kc mechanical filter,…
vk6ada.com.au • Collins Radio S-Line Technical Series Collins 30L-1 Linear AmplifierFailure Prevention Kit — Component & Modification Design A complete engineering analysis of the ten predictable Collins 30L-1 failure modes: voltage doubler HV capacitors, 811A tube plate-to-grid shorts, fusible bias…