Hey guys, its been a few years since anyone posted here, but I was having the same problem with my RB4 and was able to fix it. One of the 470uF capacitors (C25 on the circuit diagram) that supply the 15V rails to the pre-amp was blown and short-circuited. A quick replacement and everything was back to normal!
Laney RB4 - Stopped Working
in Amps and Cabs
Posted · Edited by hippopatimus
Hey guys, its been a few years since anyone posted here, but I was having the same problem with my RB4 and was able to fix it. One of the 470uF capacitors (C25 on the circuit diagram) that supply the 15V rails to the pre-amp was blown and short-circuited. A quick replacement and everything was back to normal!