[Amps] Russian HV Supply Capacitors

[peter chadwick]

You need to know the ripple current rating. SCR commutation capacitors have the sort of ratings you need.

There are a lot of physically small, high capacity (20+mFd) caps at 2.5 or 3kV around meant for defibrillators: they MIGHT be OK in a choke input supply where the capacitor ripple current is reduced compared with a capacitor input filter. They have proved to be totally inadequate in capacitor input HV supplies for linear amps - especially in contests where the operation is /P and no on-site repair (i.e. Murphy is on overtime)is practicable!

73

Peter G3RZP


========================================
 Message Received: Jan 09 2014, 06:49 PM
 From: radio at modesgate.com
 To: amps at contesting.com
 Cc: 
 Subject: [Amps] Russian HV Supply Capacitors
 
 To the un-initiated, these look like an elegant solution to my HV
 smoothing capacitor requirement.  Perhaps too elegant a solution.  Am I
 missing something?  If anyone has an opinion, or direct experience of
 using these, commentary would be appreciated.
 
 http://www.ebay.com/itm/60uF-4kV-6kV-HIGH-VOLTAGE-CAPACITORS-New-Lot-of-2pcs-hv-plasma-laser-tesla-/201017069009?pt=US_Ham_Radio_Amplifiers&hash=item2ecd8d0dd1
 
 If they are any good, any info on cheaper sources (or any for sale in the
 UK) would also be good.
 
 73
 
 Denis MW0CBC / GW8OQV
 
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