Hi, I have a SF mid-70s Vibrolux Reverb that I've pulled from my grandparents garage. The original 5U4GB rectifier tube was missing, so I bought a new one. I plugged it in and turned on the amp. I strummed some chords but nothing was coming out from the speakers not even a silent hiss. Then, after nearly two minutes, the rectifier starts to red plate followed by a small blue spark, I switch the amp off immediately and noticed the slo-blo fuse was fried. I guess I've busted the rectifier too. Since it's over 35+ years old, I'm gonna recap all the electrolytic caps. The dead cathode caps might've not supplied the correct amount of voltage to the rectifier, which in turn, destroyed it. So here's what I'm planning to do: Under the dog house, there are five 16uF/450V caps. I'll be replacing them with F&T 16uF/475V caps. Also there's a 1 Watt 2.2K carbon comp resistor which should've been a 1 Watt 4.7K. That's what the schematics say. Inside the chassis, there are five small 25uF/25V caps, One in pairs, 3 single and the other is connected to the vibrato jack and one of the 12AX7 pins. This isn't how it was drawn in the schematics and Fender seriously need to update the drawing. Gonna replace them with Spragues of the same value. There's also a 5–50V cap, and according to the schematics it's also a 25uF/25, but Imma replace it with a 25uf/50V. And there are two caps (I think it's popularly known as cathode caps) which read 80-75V, and in the schematics, it's a 50uF/70V. Gotta replace them with the recommended 100uF/100V. Once done, a new rectifier would be plugged in and hopefully it should be in fighting condition. I'm guessing that a bad rectifier could be the cause for the amp not emitting any sound. And the cathode caps causing the rectifier to fail. I'm hoping to get advice from anyone who has experienced with the same particular amp or have experienced the same symptoms. I was also informed that there could be something else that needs to be investigated. By the way, I live in Brunei, and I usually order the parts from tubedepot.com.