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Total 25 documents matching your query.

1. [Amps] Door knob Capacitors (score: 1): Author: garyschafer@attbi.com (Gary Schafer); Date: Thu, 23 May 2002 15:55:29 -0400; Does anyone know about the old TV door knob caps. Typically 500 pf at 20 kv. Are they mica or ceramic and are they capable of handling any sizable current? Thanks Gary K4FMX; /archives//html/Amps/2002-05/msg00399.html (6,382 bytes)
2. [Amps] Door knob Capacitors (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Thu, 23 May 2002 16:39:45 -0700; Ceramic and they are not designed to handle RF. - R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6K, www.vcnet.com/measures. end; /archives//html/Amps/2002-05/msg00402.html (6,479 bytes)
3. [Amps] door knob capacitors (score: 1): Author: Glen Zook <gzook@yahoo.com>; Date: Sat, 26 Feb 2011 07:07:49 -0800 (PST); I need either a 1000 pf or two 500 pf door knob capacitors with at least a 10 kV rating. These are for use as loading capacitors in a 160-meter single band liner using a pair of GI-7bT Russian tubes.; /archives//html/Amps/2011-02/msg00187.html (7,757 bytes)
4. Re: [Amps] door knob capacitors (score: 1): Author: "DJ7WW" <dj7ww@t-online.de>; Date: Sun, 27 Feb 2011 20:23:57 +0100; Why do you want at least a 10KV rating while the capacitors will not see more then 500V? More important is to select a RF doorknob with low TCC. 73 Peter I need either a 1000 pf or two 500 pf door kn; /archives//html/Amps/2011-02/msg00197.html (8,530 bytes)
5. Re: [Amps] door knob capacitors (score: 1): Author: Glen Zook <gzook@yahoo.com>; Date: Mon, 28 Feb 2011 08:06:01 -0800 (PST); Basically, the other door knobs that I obtained for a VERY good price were 20 kV! Definitely overkill. I "solved" the problem by putting 2 0.01 mfd capacitors in series with the 1400 pf door knob fix; /archives//html/Amps/2011-02/msg00203.html (9,065 bytes)
6. [Amps] door knob capacitors (score: 1): Author: Rob Atkinson <ranchorobbo@gmail.com>; Date: Mon, 28 Feb 2011 10:58:39 -0600; You don't want to use doorknobs as loading caps especially on 160. they won't handle the current. Learned that the hard way. When I knew less than I do now (which still isn't much) I used a Centralab; /archives//html/Amps/2011-02/msg00206.html (7,009 bytes)
7. Re: [Amps] door knob capacitors (score: 1): Author: "GEORGE WALLNER" <aa7jv@atlanticbb.net>; Date: Mon, 28 Feb 2011 18:32:00 -0500; Rob, It depends on the capacitor. The ones intended for high RF currents are marked to show the maximum reactive current they can handle. Some time ago I had the same experience as you, with a cap li; /archives//html/Amps/2011-03/msg00002.html (7,607 bytes)
8. Re: [Amps] door knob capacitors (score: 1): Author: "Bill, W6WRT" <dezrat1242@yahoo.com>; Date: Mon, 28 Feb 2011 17:41:21 -0800; ORIGINAL MESSAGE: REPLY: Depends on the doorknob. I have used Russian made doorknobs for years as tune padders on 160 with no problems. You want ones that are physically large and heavy, just like th; /archives//html/Amps/2011-03/msg00005.html (7,885 bytes)
9. Re: [Amps] door knob capacitors (score: 1): Author: "Gary Schafer" <garyschafer@comcast.net>; Date: Mon, 28 Feb 2011 19:58:42 -0500; Hi Glen, Interested in the parameters on the GI-7B tubes. I have a pair here to put together. What plate voltage do you have on them? How much plate current? How much bias? Plate idle current? Grid c; /archives//html/Amps/2011-03/msg00006.html (10,231 bytes)
10. Re: [Amps] door knob capacitors (score: 1): Author: Glen Zook <gzook@yahoo.com>; Date: Mon, 28 Feb 2011 20:03:12 -0800 (PST); I don't really have enough plate voltage on them right now. Under load ended up with around 1700 volts. But, that is what I get out of the transformer that I had in the junque box! The plate current; /archives//html/Amps/2011-03/msg00007.html (9,353 bytes)
11. Re: [Amps] door knob capacitors (score: 1): Author: Rob Atkinson <ranchorobbo@gmail.com>; Date: Tue, 1 Mar 2011 11:32:27 -0600; Yeah but how do you tell a fleamarket doorknob is okay for RF. If you have a lot of do re mi and can get them new I guess it's easy, but your typical $2 doorknob in a box sitting on the pavement in a; /archives//html/Amps/2011-03/msg00011.html (8,609 bytes)
12. Re: [Amps] door knob capacitors (score: 1): Author: Glen Zook <gzook@yahoo.com>; Date: Tue, 1 Mar 2011 11:46:45 -0800 (PST); The 1400 pf capacitor that I am using is over 2 inches in diameter and about 3/4ths inch thick! I "hope" that it can "take" the current! :>) Glen, K9STH Website: http://k9sth.com Depends on the doork; /archives//html/Amps/2011-03/msg00015.html (8,044 bytes)
13. Re: [Amps] door knob capacitors (score: 1): Author: "Diane and Edward Swynar" <deswynar@xplornet.ca>; Date: Wed, 2 Mar 2011 12:39:56 -0500; Hi Guys, All this talk about door knob capacitors only serves to remind me of all of the many travails & troubles that I've had over the years, using them as padders in both the plate loading and pla; /archives//html/Amps/2011-03/msg00022.html (10,548 bytes)
14. Re: [Amps] door knob capacitors (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Wed, 2 Mar 2011 15:32:53 -0500; Real Centralab and other US RF doorknobs are mostly 5, 7.5, and 15KV in the most common 2 sizes. The caps in Heath SB amps are cheap non RF rated that will often do bad things on 10M. Check out High; /archives//html/Amps/2011-03/msg00025.html (10,096 bytes)
15. Re: [Amps] door knob capacitors (score: 1): Author: Rob Atkinson <ranchorobbo@gmail.com>; Date: Wed, 2 Mar 2011 17:21:08 -0600; Thanks Carl; mine were probably 15 KV then. I looked at the High Energy website. Those caps look great but they also look kind of pricey. Well you get what you pay for. I'm gg to give some micas I ha; /archives//html/Amps/2011-03/msg00028.html (11,548 bytes)
16. Re: [Amps] door knob capacitors (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Wed, 2 Mar 2011 19:53:48 -0500; Those are pricey when new but even NOS 15KV 857's are often $5-10 at hamfests and the small ones can be had for $1-3 in perfect condition. Appearance counts, but dirt doesnt. Huh you say? An RF abuse; /archives//html/Amps/2011-03/msg00030.html (12,314 bytes)
17. Re: [Amps] door knob capacitors (score: 1): Author: "Fuqua, Bill L" <wlfuqu00@uky.edu>; Date: Fri, 4 Mar 2011 00:19:10 -0500; I have a number of old door knob capacitors. One is much larger than a real doorknob. It is 1000pf fixed vacuum capacitor. Was used in a HF amplifier with a 3CX10,000A7 as the plate coupling capacito; /archives//html/Amps/2011-03/msg00035.html (13,498 bytes)
18. Re: [Amps] door knob capacitors (score: 1): Author: "Phil Clements" <philc@texascellnet.com>; Date: Thu, 3 Mar 2011 23:12:46 -0600; Thanks Carl; mine were probably 15 KV then. I looked at the High Energy website. Those caps look great but they also look kind of pricey. Well you get what you pay for. Why don't you just order what; /archives//html/Amps/2011-03/msg00036.html (8,459 bytes)
19. Re: [Amps] door knob capacitors (score: 1): Author: Rob Atkinson <ranchorobbo@gmail.com>; Date: Fri, 4 Mar 2011 07:16:27 -0600; Tnx for those tricks Carl--I looked at mine and fortunately they all look okay. I guess they just are not high current RF doorknobs. I also have some 500 pF brown ones about 3/4 inch diam. and 3/4 in; /archives//html/Amps/2011-03/msg00040.html (13,805 bytes)
20. Re: [Amps] door knob capacitors (score: 1): Author: Glen Zook <gzook@yahoo.com>; Date: Fri, 4 Mar 2011 09:05:31 -0800 (PST); No problem! My topic was finished a couple of days ago. Glen, K9STH Website: http://k9sth.com Thanks Carl; mine were probably 15 KV then. I looked at the High Energy website. Those caps look great; /archives//html/Amps/2011-03/msg00042.html (8,913 bytes)

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