Hello everyone. I was recently given an early 465 scope. It has a trace and seems to work somewhat, but needs some TLC. I'm new to oscilloscopes, so bear with me if I say something wrong.
This is an early 465, so I've posted the relevant schematic in the photos section in case it is not freely available.
While checking the voltages at the power supply, I noticed that the +120 is high (+155). All other voltages are OK. Looking a little further, I realized that SCR Q1514 has just been totally removed by someone. Reading the circuit description in the manual, it appears that this SCR is there to provide overvoltage protection. It also says that if Q1514 is destroyed, the +120 V supply can rise to +160.
So before I place an order, would you guys think that the missing Q1514 is the cause of the higher +120 voltage, or did the higher voltage cause it to blow? Should I be replacing some of the other components at the same time?
Any assistance would be greatly appreciated.
