Hi All, I recently was gifted an sb-401 that does not function. I purchased another for in hopes I could get one of them working, but it had a shorted cap in the high voltage. Replaced the cap and the radio has the EXACT same problem. Putting the radio's in tune mode relay 1 does not fully engage and relay 2 does nothing. I put the gifted 401's relay driver tube into my dads sb-400 and the tube worked fine. Manually helping relay 1 to close caused relay 2 to close but there is no plate voltage or current. High voltage reads normal and ALC is mid scale in standby and CW open key. when helping relay 1 close High voltsge stays the same and ALC pegs to the 0 sidew of the scale. I traced the 250 V + dc to coil 1 and ground but only 10V+ crross the coil. When put in tune mode it reads about 50vdc across the coil. Im a bit confused but since i have 2 units with the exact same problem I think its probably pretty common. Any thoughts or sugestions would be greatly appreciated
73 KC7GRH
73 KC7GRH
