The first place I always start with an amp rebuild is with the power supply. After all, when it comes down to it, an amplifier in nothing more than a modulated power supply and can only be as good as it's power supply!
The reason the DB130 with dual rectifiers is my favorite version is because with it you can reconfigure the power supply to use 6AU4, 6AX4, 6CG3 or other damper diodes. You can either run the 6 volt filaments for the damper diodes off of the original 5VAC tap or you can install a separate 6 volt transformer for them. I've done it both ways and, believe it or not, it only makes about 1 volt difference on the B+.
Damper diodes are tough. They have a low voltage drop, which helps lower the power supply impedance. They also have a very slow voltage ramp as they warm up. Think of it as a built-in soft start. They were also designed to provide gobs (that's a technical term) of current.
For this project, I chose to use the 6CG3 damper diode. Why? Because I had the ceramic compactron sockets and the 6CG3 tubes!
If you don't want to convert to damper diodes, you can also simply change the rectifier tubes to 5V4's. They use the same filament voltage and current (5V @ 2 amps) as the 5Y3, have a higher current capability, and a lower voltage drop as well as a slow high voltage ramp-up. No wiring change is needed, it's a drop in replacement. Do not use 5U4's, they draw 3 amps of filament current each and will make the power transformer run quite hot.
Here's the much simplified power supply schematic with all unnecessary preamp sections removed. The power supply capacitance is significantly upgraded as is the safety margins. In the original configuration, the 33K resistor used for dropping the B+ for the driver section was only an 8 watt resistor. This resistor is pretty much fried on every 130 I've ever seen and sometimes gave off so much heat so as to blacken the metal of the chassis above the resistor. So, I replace them with 33k 50 watt wire-wound resistors. They aren't that much bigger physically and they run quite cool now! I also change out the 15k 2 watt resistors to a 15k 10 watt wire-wound resistors. Again, we have increased the safety margin and lowered the operating temps of these parts.