Date: Thu, 14 Dec 2017 10:46:56 -0800
From: Elliott L <kilocharlie8@gmail.com>
To: Jim Thomson <jim.thom@telus.net>
Cc: amps@contesting.com
Subject: Re: [Amps] Henry 2k-4 HV inductor
<Alright, there were some really interesting comments on this question,
,thank you all!
<If I were to ditch the HV choke and keep the plate transformer, can I
simply add additional caps in parallel with the existing 20uF cap? Will an
extra 20-40uF do the trick? I see a lot on eBay coming out of Russia.
Also, should I be worried about the increase of inrush on power-on?
I like the idea of ditching the choke, it really does seem unnecessary.
Thanks,
--E
W6EL
## Nope, cuz then you have switched from a choke input filter to a
C input filter.
## what is your B+ right now at idle..when it was working correctly ?
lets assume it was say 3000 vdc. Your plate xfmr would have been
3333 vac secondary. 3333 x .9 = 3000 vdc . That’s in a choke
input with lotsa bleeder current.
## Take the same 3333 vac sec and now use a C input filter, and it now
becomes 3333 x 1.414 = 4713 vdc
## see if the schematic sez what the sec vac is.... then multiply by 1.414
to derive what your new B+ value will be.
## This is the issue with these older resonant and non resonant choke
input supplies. You cant simply swap to a high C filter, without the
B+ skyrocketing in value. If you want to swap to a high C filter,
you require a plate xfmr with a much lower vac sec.
## which is actually not a bad idea. Hyboer will make any size xfmr
u want for a reasonable cost, with whatever pri and sec taps you want.
## A 3110 vdc supply only requires a 1100 vac sec if a doubler is used.
Then just a series string of 8 x 450 vdc lytics. or a 2200 vac sec and a FWB.
Jim VE7RF
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