[Amps] choke - cap filter network in PS

[Carl]

>I have noticed that the older amps that use a choke input filter network
> such as the old Henry amps use a small value for the filter capacitor.
> My old Henry 2K used something like a 10uf oil filled cap after the
> resonant filter choke network. Is their a particular reason to not use a
> 32uf 4500v GE unit that I have a couple of as a replacement?


Nope it will work fine as the choke sets the safe peak current thru the 
rectifiers.


> Second question, since I have two of these GE units would I see any
> improvement or increase in B+ if a placed one of these units before the
> choke network, the new configuration would be cap -choke - cap, or 32uf
> cap - choke - 32 uf cap.


If this is for a Henry 2K:

Probably a lot of bright lights and smoke with the 3B28's. Just the big cap 
and no choke will work with healthy SS diodes but then you might have 
excessive HV for the tubes.

Without the resonant tuning cap the choke after the cap will give some HV 
reduction mainly determined by its winding resistance. Put the 10uF in front 
to limit the HV a bit and the 32 after for more filtering. Go to the older 
HB graphs/formulas to see if that is sufficient critical inductance to 
prevent HV soaring. Probably a lot of overkill in the PS and too much HV for 
pricey 3-400Z's. 1N5408 or 6A10 diodes will have plenty of surge headroom.

Carl
KM1H



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