Deluxe Reverb Reissue 1st Filter cap

[Dan T.]

I'm looking at the schem for the DRRI and am a bit confused about the power supply...
Immediately after the rectifier there is a 220mF cap in series with a 47 mF cap.The 220 is paralleled with a 100k resistor, and the 47 is paralleled with a 470k resistor.From my understanding, this should give 38.7mF of capacitance.
Where I am confused is this....according to the schem , the 220mF cap is rated at only 100V, but the HT at this point is about 400VDC.How can this cap survive?
The 47mF cap is rated at 500v. The schem is on pg6
Any comments appreciated as I'm trying to learn.
The original Deluxe reverb ab763 used two 16mF caps paralleled in this spot.
http://www.schematicheaven.com/fende...erb_manual.pdf

[JoeM]

I'm looking at the schem for the DRRI and am a bit confused about the power supply...
Immediately after the rectifier there is a 220mF cap in series with a 47 mF cap.The 220 is paralleled with a 100k resistor, and the 47 is paralleled with a 470k resistor.From my understanding, this should give 38.7mF of capacitance.
Where I am confused is this....according to the schem , the 220mF cap is rated at only 100V, but the HT at this point is about 400VDC.How can this cap survive?
The 47mF cap is rated at 500v. The schem is on pg6
Any comments appreciated as I'm trying to learn.
The original Deluxe reverb ab763 used two 16mF caps paralleled in this spot

The cap survives because the paralled resistors form a voltage divider so the 100v cap doesnt see over 100v. 100k/100k+470k, about 70V across the 220uF cap. (Someone please check my math!). I've wondered why Fender did it this way.

[octal]

My theory, and it is just that, is that this is a scheme to reduce the max inrush current on the rectifier tube. The two caps will charge at different rates as they "come up" giving the inrush current a stepped response.

I could be totally and utterly wrong here.

Nathan