Mail Archive Search: <toroid tank coil>

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References: [ toroid: 989 ] [ tank: 6174 ] [ coil: 5661 ]

Total 215 documents matching your query.

161. Re: [Amps] HF2500 - 15 meter problem (score: 32): Author: Steve London <n2icarrl@gmail.com>; Date: Wed, 24 Aug 2022 18:35:03 -0600; Well, it looks like it really is the plate choke. It became obvious with the last test. See https://www.kkn.net/~n2ic/melted_choke.jpg Where do I get a new plate choke, or at least a new delrin form; /archives//html/Amps/2022-08/msg00031.html (10,901 bytes)
162. Re: [Amps] HF2500 - 15 meter problem (score: 32): Author: gudguyham--- via Amps <amps@contesting.com>; Date: Thu, 25 Aug 2022 00:24:28 +0000 (UTC); Steve, most of the problems with the tank circuit is from having the 40-160m L2 toroid burning up. Ive got an HF2500 in my shop right now with a melted down L2 toroid. There is a VERY NARROW group; /archives//html/Amps/2022-08/msg00030.html (10,259 bytes)
163. Re: [Amps] Need Smarter Than I Am Help. (score: 32): Author: Kim Elmore <cw_de_n5op@sbcglobal.net>; Date: Sun, 10 Oct 2021 11:24:11 -0500; I did this once on a single-tube 3-500Z amp (an AL-80A) and raised the B+ about the same amount. A few back-of-the-envelope calculations showed that I needed more L in the tank circuit. It used a Pi-; /archives//html/Amps/2021-10/msg00029.html (15,806 bytes)
164. Re: [Amps] Need Smarter Than I Am Help. (score: 32): Author: Kim Elmore <cw_de_n5op@sbcglobal.net>; Date: Sun, 10 Oct 2021 12:10:16 -0500; I did this once on a single-tube 3-500Z amp (an AL-80A) and raised the B+ about the same amount. A few back-of-the-envelope calculations showed that I needed more L in the tank circuit. It used a Pi-; /archives//html/Amps/2021-10/msg00007.html (8,661 bytes)
165. Re: [Amps] Pi-L Network Question (score: 32): Author: "Carl" <km1h@jeremy.mv.com>; Date: Mon, 18 Jun 2012 13:35:29 -0400; Id think that a pair of 8877's run at 3CX800A7 voltages would be an ideal choice for a reliable amp and a Pi-L included. OTOH, there are very few plain vanilla 800's available at modest cost and the; /archives//html/Amps/2012-06/msg00248.html (10,074 bytes)
166. Re: [Amps] Ceramic capacitor ratings (score: 32): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Fri, 13 Apr 2007 23:09:21 -0400; Now the question is about ceramic padder capacitors used in the plate tune circuit. There is a variable plate tune cap that is 23-347 pf that is in series with two (parallel) ceramic small door knob; /archives//html/Amps/2007-04/msg00116.html (9,222 bytes)
167. Re: [Amps] Swan Mark 1 on 160 meters (score: 29): Author: John Keating <john.keating@outlook.com>; Date: Tue, 29 Jun 2021 23:29:10 +0000; I have a stack of two T-225A-2 as the low band tank coil in my QRO HF2000 (2 x 3-500z). It does get quite warm on extended key down but so far no failure. John AI6LY Get Outlook for Android<https://a; /archives//html/Amps/2021-06/msg00016.html (8,210 bytes)
168. Re: [Amps] Is Amps still in existence? (score: 29): Author: PA3DUV <pa3duv@planet.nl>; Date: Sun, 08 Oct 2006 17:36:23 +0200; How about Teflon Ian? Last week I replaced the toroid core and side insulators of my HF amp (40-80-160 m tank coil) for Teflon ones. So far @ 6 kW Dauerstrich it seems to keep up quite well. Cheers,; /archives//html/Amps/2006-10/msg00059.html (10,343 bytes)
169. Re: [Amps] Is Amps still in existence? (score: 29): Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>; Date: Sun, 8 Oct 2006 18:28:37 +0100; Might well try Teflon, if I can find some tubing of the right diameter. However, in a few months I may take the whole thing off-line and rebuild it as a Pi-L, which should reduce the working Q and th; /archives//html/Amps/2006-10/msg00057.html (8,905 bytes)
170. Re: [Amps] Amps Digest, Vol 42, Issue 40 (score: 29): Author: "Edwin Karl" <edk0kl@centurytel.net>; Date: Thu, 15 Jun 2006 15:30:24 -0500; On the question of Scotch tape .. I beleive it serves 2 purposes; a. to keep the formvar insulation on the wire from being scratched by sharp edges on a not so neatly made torroid, also to make a smo; /archives//html/Amps/2006-06/msg00297.html (24,351 bytes)
171. Re: [Amps] RF Chokes (score: 28): Author: "Will Matney" <craxd1@ezwv.com>; Date: Mon, 31 Jan 2005 09:13:27 -0500; Angel, On the antenna side, there's only RF passing by and no DC in the choke to make it saturate easily. The DC current is what makes one saturate easy like in a filter choke in the PS. Even at that; /archives//html/Amps/2005-01/msg00636.html (13,797 bytes)
172. Re: [Amps] What to buy? (score: 25): Author: "Jim W7RY" <w7ry@inbox.com>; Date: Sat, 5 Feb 2011 11:27:07 -0800; So where do you buy this stuff? I need some for my 8877 project. I'm not happy with the 80 meter toroid getting so hot. I run a lot of RTTY. The amp runs toroids on 80 and 160. The rest of the tank; /archives//html/Amps/2011-02/msg00031.html (8,809 bytes)
173. Re: [Amps] RF Chokes (score: 25): Author: "Will Matney" <craxd1@ezwv.com>; Date: Mon, 31 Jan 2005 11:12:16 -0500; On Mon, 31 Jan 2005 07:53:24 -0800, R.Measures <r@somis.org> wrote: On Jan 31, 2005, at 2:38 AM, Angel Vilaseca wrote: I am building a 3.5 to 30 MHz amp and I have been following this interesting thr; /archives//html/Amps/2005-01/msg00641.html (15,681 bytes)
174. [AMPS] dentron amplifier (score: 25): Author: nospam4me@juno.com (nospam4me@juno.com); Date: Mon, 4 Oct 1999 23:24:36 -0700; re: dentron amplifier(s) Lent it to you not working, He's a friend eh..? Aside from the "fuse" action, some 10 ohm resistors in the cathode lead of each tube improves linearity quite a bit. It's a gr; /archives//html/Amps/1999-10/msg00177.html (12,644 bytes)
175. Re: [Amps] Preventing current flow on PEN/EGC (protective earth conductor/equipment grounding conductor). (score: 24): Author: Lukasz <sp4it.mail@gmail.com>; Date: Fri, 29 Nov 2024 17:16:22 +0100; Hi Lukasz, I use a tube amplifier which I have built in 1975 in a no RCD environment. It uses a 3-phase HV power supply as well as single phase small power supplies. The amplifier is of course ground; /archives//html/Amps/2024-11/msg00056.html (15,672 bytes)
176. Re: [Amps] Commander HF 2500 (score: 24): Author: Bill Turner <dezrat@outlook.com>; Date: Wed, 24 Jan 2018 17:06:55 +0000; -- ORIGINAL MESSAGE --(may be snipped) REPLY: If you have the time and inclination, replacing them is a good idea. Filtering a HV supply for a legal limit amp is pretty heavy duty use due to ripple c; /archives//html/Amps/2018-01/msg00135.html (8,241 bytes)
177. Re: [Amps] 3CX800A7 Grid Current Problem (score: 24): Author: Gudguyham@aol.com; Date: Wed, 25 Jan 2012 17:27:48 -0500 (EST); Thanks for the replies. I, too, at first thought it would involve a padder in the output tank circuit. Something I should have out in my first post: there are no padders in the output circuit. The sc; /archives//html/Amps/2012-01/msg00190.html (7,769 bytes)
178. Re: [Amps] 3CX800A7 Grid Current Problem (score: 24): Author: Gudguyham@aol.com; Date: Wed, 25 Jan 2012 17:06:40 -0500 (EST); The HF-1250 SHOULD have a grid trip circuit. Check your manual. Most ceramic tube amps running 3CX800 and 8877 tubes will present very high grid current out of tune. The grid current rises VERY quick; /archives//html/Amps/2012-01/msg00189.html (9,217 bytes)
179. Re: [Amps] 3CX800A7 Grid Current Problem (score: 24): Author: "Paul Elliott" <paab@valornet.com>; Date: Wed, 25 Jan 2012 14:00:36 -0800; Thanks for the replies. I, too, at first thought it would involve a padder in the output tank circuit. Something I should have out in my first post: there are no padders in the output circuit. The sc; /archives//html/Amps/2012-01/msg00188.html (8,473 bytes)
180. [AMPS] sweep tubes above 24MHz... and the GLA 1000 (score: 24): Author: nospam4me@juno.com (Skip S Isaham); Date: Tue, 01 Dec 1998 23:13:54 EST; been to Any Yes, I don't have the information handy, but from memory.... The GLA-1000 arrives with the ten meter coil installed, just disabled with a mechanical stop on the band switch. Part of the; /archives//html/Amps/1998-12/msg00016.html (8,989 bytes)

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