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Re: [Amps] Plate Loading Padding Caps

To: "'Ham H'" <>, <>
Subject: Re: [Amps] Plate Loading Padding Caps
From: <>
Date: Sat, 22 Dec 2018 14:15:31 -0500
List-post: <>

You can use CERA-MITE NPO, the max I was able to find was 170 PF, Its
available at DIGIKEY, or parallel 62pf

CERA-MITE - 564CC0GAA302EL620J - Capacitor, ceramic. 62pF 3,000V. $US 1.00



-----Original Message-----
From: Amps <> On Behalf Of Ham H
Sent: Friday, December 21, 2018 6:44 PM
Subject: [Amps] Plate Loading Padding Caps

I see this has been talked about before but I have not found the information
I need.

I have an Amp Supply LK-500 that has bad load padding caps on 80 Meters.
The factory caps were 470Pf 5 Kv N3300. I dont believe that was a great
choice for this application as they are badly heating.

I know I need class 1 NPO COG caps with 1 KVAR but a source for these eludes
me. Most web locations have either no data sheets or data sheets that give
little useful information.

Where can I find the proper RF transmit caps. I have no room for doorknobs
so ceramic is my only choice. I have located caps with NPO and COG rating at
the proper Kv rating but no data sheet so they are a crap shoot.

These magic small Chinese caps with huge voltage ratings at first glance
look tempting until you look closely at them and see they wont last long in
RF use.


Gary K4MT
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