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In Reply to: RE: Tube voltage doubler posted by Tre' on May 02, 2016 at 14:04:18
I would say that 5U4's are cheap...but that was once said by folks who abused 6DJ8's in pre-amp designs. It just isn't a good idea to beat on them too hard.
cheers,
Douglas
Friend, I would not hurt thee for the world...but thou art standing where I am about to shoot.
Follow Ups:
I agree with the sentiment of not beating the guano out of 5U4s or any other type. However, we have to remember that rectifier data sheet limits were "settled", when PSU 'lytics tolerance was -20/+100 %.
I'm not a simulation guy. I believe that the 1st thing to do is taking all steps needed to prevent arc over, at power turn on time. Of course, arcing is very bad, at any time. JMO, taming turn surge "demons" goes a long way towards obtaining overall good behavior. NTC inrush current limiters can contribute towards satisfactory outcomes.
Eli D.
"...prevent arc over..."
By all means.
"...beating the guano out of..."
Any cap input filter will cause the diodes and the first cap to be beaten.
Maybe not beyond their capability but they are being beaten on, repeatedly.
A critical inductance input choke puts a stop to all that.
The whole supply calms down.
I like calm.
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
Quite so...but the doubler performance is largely a function of peak repetitive current capacity, and given that tube diodes are at a severe disadvantage to the modern SiC Schottky types.
take the sim data and use it with a few tsp of salt, and be prepared to revise the circuit...:)
cheers,
Douglas
Friend, I would not hurt thee for the world...but thou art standing where I am about to shoot.
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