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Can I use the diode trick that Eli has posted many times when I have a dual 5AR4 rectifier? Also, how would I wire the diodes onto the two rectifiers? I am guessing that one diode would go to pin 4 on one transformer side, and the other diode onto the second tube at pin 6 where the other transformer side is. Also, Eli recommended 1N4007, would those same diodes work for the dual rectifier setup on my Scott 340? thanks!
Follow Ups:
I'd be careful with that diode mod. The stock caps on the unit are good to 500 volts or less. Even with the dual 5AR4 rectifiers you are pushing it with modern voltage. Expect to see close to 500V on your 7591 tubes unless you use a variac or bucking tranny.
Connecting SS diodes in series with the vacuum diodes DOES NOT raise the B+ rail voltage. The sole purpose of the tweak is to add some PIV headroom.
Eli D.
I recommend the UF4007, for less SS switching noise. The vacuum rectifier(s) block SS diode switching noise, but (IMO) less noise to block can't be bad.
The 1 A. SS diodes should be adequate for 2X 5AR4s. However, "belt and suspenders" suggests 3 A. UF5408s.
You have the right idea. Wire 1 diode in each of the lines that connect the rectifier winding to the vacuum rectifiers. Don't forget that SS anode connects to the trafo and SS cathode connects to the tube.
Eli D.
Thanks, Eli, the main reason for me was the startup current rush that can occur with the Sovteks and destroy them correct?
Sometimes, a Sovtek 5AR4 will arc over at power on. The effect is voltage handling related. The SS diode in series raises the overall PIV capability and the arcing does not occur.
Don't take liberties with vacuum rectifier capacitance limits. Doing so can lead to permanent damage. :> ((
Eli D.
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