diode/tube rectifier in parallel

[joshdfrazier]

recently acquired a univox U202, my "dream" amp! The amp has (or had, rather) alot of sag, which really isn't my thing. I popped in a couple of diodes, and added a switch to cut off B+ from the diodes should I choose to use the 6ca4 in the future. I didn't alter any of the original wiring, and the leads from the switch are soldered right on to the tube socket.

The masochist in me is dying to find out what would happen if i popped the tube in and left the solid state b+ switch on, running the diodes and tube in parallel. The switch is right behind where the tube would be, so it would be pretty hard to accidentally flip the switch with the tube in place. Still though, wondering how "dangerous" this could be.

[sluckey]

running the diodes and tube in parallel.

It would act as if you only had diodes in place. No danger.

[analogdino]

The 6CA4 would add about 6 watts to the power transformer load (the 6CA4 heater.) With the Si diodes I would add a 50 ohm WW resistor in the rectifier cathode line before the input capacitor to cut ripple current.
Cheers,
Roger