[Amps] choke - cap filter network in PS

[Carl]

Then just replace the diodes with real ones (-;

Carl



Carl,
Noted. The 3-400Zs have been replace with 3-500Zs already. The 3B28s
have been replaced with K2AW units, I think 14kv 1 amp jobs.

Lane
Ku7i

-----Original Message-----
From: Carl [mailto:km1h at jeremy.mv.com] 
Sent: Tuesday, March 23, 2010 8:05 AM
To: Zeitler, Lane LT, FST-1; amps at contesting.com
Subject: Re: [Amps] choke - cap filter network in PS



>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



>
>
>
> Thank you in advance to all. Great forum.
>
>
>
> LT Lane Zeitler
>
> ARS Ku7i
>
> Currently onboard USS Peleliu LHA-5
>
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