Filter caps for the #124 build

[echo44]

Does anyone know where to find the radial sprague atom
300u/350v caps?
I notice looking at other peoples pics of their builds there is great variation
from the layout that on this forum.
Ok here is a real rookie question. Does it matter if you run them in series or parallel as far as sound goes? So instead of running two 300u in series as on the layout you could run 2x80u/350v in parallel?
Also I have lots of pullback cloth wire from my fender builds any opinions on using this type of wire?

[heisthl]

1. Modern Spragues look big on the outside but have smaller caps on the inside. NOS is not good when it comes to filter caps - they age on the shelf and at best require reforming before use.
2. As long as you're using reasonably good caps parallel or series or series parallel doesn't matter - just make sure to always use equalizing resistors for the totem pole configuration(s).

EDIT - just reread your post - not sure about the Sprague radial caps - was referring to the axial when I said there were smaller caps inside.

[Structo]

The reason the #124 filter caps are in series is because the 350v rating is too low to handle the voltages present.
When caps are ran in series the values halve like in a parallel resistor circuit but the voltages add up. (that is of course if both caps have the same value)
The resistors help balance the voltage across the two caps and also act as voltage bleeders when the amp is powered down.

So with two 300uF 350v caps in series, you get 150uF and 700v rating.

When a tube amp is first powered up there is an inrush of current before the caps stabilize and the voltage runs high for a second or two.

That can easily surpass the 350v rating of one cap, so he used two there to have a higher voltage rating.

[echo44]

Does anyone know where to find the 300u/350 capacitors
or ahould I try to create a similar circuit using lower value capacitors in parallel?