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Title: Ancient Transmitting caps? Post by: Bill, KD0HG on June 02, 2011, 08:08:17 PM OK, here's the deal. I don't want a penny for several 1930s transmitting caps I found.
I inherited maintenance on an old-timey directional AM. The previous engineer is SK. He was a major packrat. Drawers of ITC cart machine parts and tape heads, for example. But he also left behind a bunch of BIG, old-time transmitting caps that predated the station. A picture of one is below. It's dual-branded "Faradon" amd "Cornell Dublier", 500 pf at 30 KV. Note the spark gap on the side of the thing. Looks like filled with beeswax in a Pyrex case. I am looking for some sort of radio museum that might want the things. It's not every day that you can find a 30 KV cap these days..Even if running spark. Suggestions welcome. Title: Re: Ancient Transmitting caps? Post by: KB2WIG on June 02, 2011, 10:18:29 PM The AWA u ze AM?
http://www.antiquewireless.org/ klc Title: Re: Ancient Transmitting caps? Post by: w3jn on June 03, 2011, 07:24:41 AM Pavek Museum of Broadcasting in Minneapolis
www.pavekmuseum.org/ Title: Re: Ancient Transmitting caps? Post by: KM1H on June 03, 2011, 08:25:31 AM Id be interested in a few between 500-2000pf for a 500KHz antenna, there maybe a lot of strange things happening at the base when I go QRO.
Carl Title: Re: Ancient Transmitting caps? Post by: K2PG on June 03, 2011, 08:39:39 AM Why don't you use some of those goodies yourself? At my 160 meter station, I use ITC cart machines for repetitious announcements, such as "CQ" calls. I use some of those capacitors (although mine are not as old) in a T-network at the base of my folded unipole antenna. The unipole is physically and electrically short for my operating frequencies, so I set up a T-network in PA and a pi-network at my place in NJ. AMfone - Dedicated to Amplitude Modulation on the Amateur Radio Bands
Cornell-Dubilier used to be located in South Plainfield, NJ, not far from the town where I grew up. |