After valve rectifier its usually 47uF.
That's to stop overloading valve rectifier.
For SS rectification you can get away with a bit high.
However if you use too much uF the charging bursts into cap can be high and maybe damage transformer or rectifiers.
That's to stop overloading valve rectifier.
For SS rectification you can get away with a bit high.
However if you use too much uF the charging bursts into cap can be high and maybe damage transformer or rectifiers.
Why on earth would you want to? What perceived advantage do you think this will give you a properly designed solid state rectifier won't? Even more distortion than transformer output tube amp can generate by itself? If you want more distortion, back off on the grid resistors.
BTW, transformers can tolerate very high surge currents. Correct selection of diodes can also handle whatever surge the filters take. It is true, many designed have way undersized diodes.
BTW, transformers can tolerate very high surge currents. Correct selection of diodes can also handle whatever surge the filters take. It is true, many designed have way undersized diodes.
A mistake many make is rating the diodes.
So we have 150VAC off transformer so that's 212VDC so you need a 250 volt diode.
Wrong, as the reverse voltage is also 212 this gives 424 volts across the diode.
So a 500 volt diode is in order.
So we have 150VAC off transformer so that's 212VDC so you need a 250 volt diode.
Wrong, as the reverse voltage is also 212 this gives 424 volts across the diode.
So a 500 volt diode is in order.
I also won't advocate replacing the SS diodes by a hybrid rectifier (the one that PRR shows), but if you're really that eager, replace R5 by a choke to get your B+ at 340 Vdc.
Best regards!
Best regards!
okay, i understand, it was a sudden idea.
I'll go back to the original plan. Maybe I'll try to trigger R5 for a choke. What do you suggest 5-10H value would be enough? thanks for the advice anyway, i'm a beginner.
I'll go back to the original plan. Maybe I'll try to trigger R5 for a choke. What do you suggest 5-10H value would be enough? thanks for the advice anyway, i'm a beginner.
A choke would improve hum rejection better than a 220 R resistor, regardles if it's 5 H or 10 H. The main reason I suggested you to do so, though, was a ckoke's usually lower DC resistance that would help you to cope with the bigger voltage drop in a rectifier tube.
Best regards!
Best regards!