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1. [Amps] Plate Choke Issue (score: 1): Author: AJ <iamfromcanadaalso@gmail.com>; Date: Wed, 3 Jan 2018 10:28:54 -0500; Hi people. I have some sort of issue I have not been able to figure out or do not understand the issue. I checked the bypass values the relay the wires etc. Ok here's the skinny, multi-band amp. Work; /archives//html/Amps/2018-01/msg00028.html (9,311 bytes)
2. Re: [Amps] Plate Choke Issue (score: 1): Author: Steve Wright <stevewrightnz@gmail.com>; Date: Thu, 4 Jan 2018 07:21:37 +1300; Well, 20uH in series with the tubes output capacitance is resonant on about 6-8 MHz. That might be worth exploring.. S _______________________________________________ Amps mailing list Amps@contesti; /archives//html/Amps/2018-01/msg00029.html (8,656 bytes)
3. Re: [Amps] Plate Choke Issue (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Wed, 03 Jan 2018 19:01:44 +0000; Hi AJ, What am I missing? Let's try. RF heating? I just did the maths. With ~30µH and no stray effects you should be getting a bit more than 1A of RF current in that choke. The RF resistance of the w; /archives//html/Amps/2018-01/msg00031.html (10,679 bytes)
4. [Amps] Plate Choke Issue (score: 1): Author: "Jim Thomson" <jim.thom@telus.net>; Date: Wed, 3 Jan 2018 11:00:06 -0800; <Hi people. <I have some sort of issue I have not been able to figure out or do not <understand the issue. I checked the bypass values the relay the wires <etc. Ok here's the skinny, multi-band amp.; /archives//html/Amps/2018-01/msg00032.html (10,536 bytes)
5. Re: [Amps] Plate Choke Issue (score: 1): Author: Victor Rosenthal 4X6GP <k2vco.vic@gmail.com>; Date: Wed, 3 Jan 2018 21:28:58 +0200; Did you check for resonance with a GDO with the choke shorted? You need to do this with it in place. 73, Victor, 4X6GP Rehovot, Israel Formerly K2VCO http://www.qsl.net/k2vco/ On 3 Jan 2018 17:28, AJ; /archives//html/Amps/2018-01/msg00033.html (10,224 bytes)
6. Re: [Amps] Plate Choke Issue (score: 1): Author: mark bitterlich <markbitterlich@embarqmail.com>; Date: Wed, 03 Jan 2018 17:31:54 -0500; I would offer that using an IR temp measurement device (gun), would be safer and easier. I've used them for lots of measurements in amps, power on in fact. You can stay well away from HV and get accu; /archives//html/Amps/2018-01/msg00036.html (10,948 bytes)
7. [Amps] Plate Choke Issue (score: 1): Author: "Jim Thomson" <jim.thom@telus.net>; Date: Wed, 3 Jan 2018 19:26:52 -0800; <Well, 20uH in series with the tubes output capacitance is resonant on <about 6-8 MHz.? That might be worth exploring.. <S in PARALLEL with the plate choke, NOT in series with it. resonance in any HF; /archives//html/Amps/2018-01/msg00039.html (8,681 bytes)
8. Re: [Amps] Plate Choke Issue (score: 1): Author: MU 4CX250B <4cx250b@miamioh.edu>; Date: Thu, 4 Jan 2018 13:05:03 -0500; Hard to believe a flashover arc could jump over a quarter of an inch. Maybe theres a VHF/UHF parasitic of some sort. Did the ceramic just overheat and crack, or did it shatter? 73, Jim w8zr Sent from; /archives//html/Amps/2018-01/msg00042.html (9,878 bytes)
9. Re: [Amps] Plate Choke Issue (score: 1): Author: "Jim Thomson" <jim.thom@telus.net>; Date: Thu, 4 Jan 2018 11:33:02 -0800; His 3650 vdc is not going to jump very far, something is resonant, or a parasitic etc. Still, 27 / 31.8 uh, IMO is not enough uh for use on 20M band. 50 uh always works.... and 1st series resonance; /archives//html/Amps/2018-01/msg00043.html (10,556 bytes)
10. Re: [Amps] Plate Choke Issue (score: 1): Author: AJ <iamfromcanadaalso@gmail.com>; Date: Thu, 4 Jan 2018 18:38:47 -0500; Jim, Manfred, Mark, Vic et-al Sorry people been busy. Interesting that Henry had a 20 uh choke for 20,15,10. That seems to be where it blew apart. This would require me to add another relay at the fe; /archives//html/Amps/2018-01/msg00045.html (12,266 bytes)
11. Re: [Amps] Plate Choke Issue (score: 1): Author: AJ <iamfromcanadaalso@gmail.com>; Date: Thu, 4 Jan 2018 18:46:10 -0500; The first one just fractured a large number of times in the same area. It shattered at the point of 20 uhy of inductance. AJ___ VE3HJ _______________________________________________ Amps mailing list; /archives//html/Amps/2018-01/msg00046.html (10,930 bytes)
12. Re: [Amps] Plate Choke Issue (score: 1): Author: AJ <iamfromcanadaalso@gmail.com>; Date: Thu, 4 Jan 2018 22:44:46 -0500; Well I hooked up the 50 uhy choke. Used some kapton tape to mark some inductance locations on it (10, 20, 30, 40) Txing at 3/4 amp plate current for a minute the choke temps are as follows. rf end 14; /archives//html/Amps/2018-01/msg00047.html (8,207 bytes)
13. Re: [Amps] Plate Choke Issue (score: 1): Author: "Fuqua, Bill L" <wlfuqu00@uky.edu>; Date: Fri, 5 Jan 2018 08:39:54 +0000; You don't necessarily need a very high voltage to get a long arc. If the choke became resonant and burnt the vaporized copper wire or even a flame can produce a plasma path for the arc and things get; /archives//html/Amps/2018-01/msg00048.html (13,997 bytes)
14. [Amps] Plate Choke Issue (score: 1): Author: "Jim Thomson" <jim.thom@telus.net>; Date: Fri, 5 Jan 2018 11:07:00 -0800; <Interesting that Henry had a 20 uh choke for 20,15,10. That seems to be <where it blew apart. <This would require me to add another relay at the feed point if I <understand you correctly. <A flash o; /archives//html/Amps/2018-01/msg00049.html (10,309 bytes)
15. Re: [Amps] Plate Choke Issue (score: 1): Author: "Jim Thomson" <jim.thom@telus.net>; Date: Fri, 5 Jan 2018 09:14:56 -0800; On his last blow up, he slid the intact windings off..and onto a new form, which lasted one week. 20-25 uh is what would be used on a 6M, 50 mhz amp, not a 20-10m amp. He needs a bigger plate choke; /archives//html/Amps/2018-01/msg00051.html (15,851 bytes)
16. [Amps] Plate Choke Issue (score: 1): Author: "Jim Thomson" <jim.thom@telus.net>; Date: Fri, 5 Jan 2018 11:41:46 -0800; <Well <I hooked up the 50 uhy choke. <Used some kapton tape to mark some inductance locations on it (10, 20, <30, 40) <Txing at 3/4 amp plate current for a minute the choke temps are as <follows. rf; /archives//html/Amps/2018-01/msg00052.html (9,830 bytes)
17. Re: [Amps] Plate Choke Issue (score: 1): Author: Rob Atkinson <ranchorobbo@gmail.com>; Date: Fri, 5 Jan 2018 16:45:18 -0600; There are a number of factors affecting choice of plate choke. Most hams know that series resonances must be keep safely out of the ham bands for which the RF amplifier will operate in. It must also; /archives//html/Amps/2018-01/msg00054.html (10,643 bytes)

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