[Amps] The power of an oversized electrolytic capacitor /

[Jim Thomson]

Date: Sat, 5 May 2012 20:59:29 +0930
From: "Leigh Turner" <invertech at frontierisp.net.au>
Subject: Re: [Amps] The power of an oversized electrolytic capacitor /
overkill


I agree Rob; a fraction of that massive HV PS capacitance would create an
unperceivable difference in the Tx performance and signal at a distant Rx
station :-)

Leigh
VK5KLT

### Leigh, how many UF in your opinion, do you  suggest  I use on a  7.7 kv  No load  B+ supply. 
What is the bare minimum I could get away with. I’m being serious here.  Rich Measures has a friend
with a 4-1000 amp...and he only uses 2 uf for a filter cap..and No choke anywhere. Nobody hears any hum. 

On  a similar note, a friend  was on one night, toggling between  his  SB-220
and his Alpha 9500.   Nobody could tell the difference between  the 1200w 
of the SB-220.....and the 1500w of the Alpha 9500.   


-----Original Message-----
From: amps-bounces at contesting.com [mailto:amps-bounces at contesting.com] On
Behalf Of Rob Atkinson
Sent: Saturday, 5 May 2012 8:53 PM
To: Jim Thomson
Cc: amps at contesting.com
Subject: Re: [Amps] The power of an oversized electrolytic capacitor

832 uF at 7.7 KV. No offense, but that's a waste of capacitors.
Rob
K5UJ

###  I got them for dirt cheap.  There is No way I would build something
like this by paying full price for new caps.   I wouldn’t buy a brand new vac cap
from jenning’s  either, they are cost prohibitive.  But I have managed to  buy
surplus, nib, sealed in the box, jennings ceramic vac caps.   They come encased in a 
metal foil  bag which has been vac sealed.  You poke a pen knife into it, and whoosh, the air 
rushs into the bag.  Once bag is removed, then you unseal the box...and the new vac cap is
inside  a box, lined with foam rubber on all 6 x sides.  

later... Jim  VE7RF