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1. [Amps] Plate choke explodes (score: 1): Author: Drax Felton <draxfelton@gmail.com>; Date: Fri, 12 Apr 2013 09:07:02 -0400; _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps; /archives//html/Amps/2013-04/msg00080.html (7,129 bytes)
2. Re: [Amps] Plate choke explodes (score: 1): Author: Eddy Swynar <deswynar@xplornet.ca>; Date: Fri, 12 Apr 2013 09:34:57 -0400; Hi Drax, Sounds like a classic case of "resonant plate choke" to me... Did you ever couple the choke to a grid dip meter beforehand, to see where its natural resonance(s) may have been...? Most likel; /archives//html/Amps/2013-04/msg00081.html (7,658 bytes)
3. Re: [Amps] Plate choke explodes (score: 1): Author: "Drax Felton" <draxfelton@gmail.com>; Date: Fri, 12 Apr 2013 15:03:06 -0400; It was an Ohmite Z-50 choke that exploded the first time. That's what Orr Radio Handbook 23rd edition uses on its 6m amp. On 2013-04-12, at 9:07 AM, Drax Felton wrote: So I've tried two different pla; /archives//html/Amps/2013-04/msg00092.html (8,153 bytes)
4. Re: [Amps] Plate choke explodes (score: 1): Author: Bill Turner <dezrat1242@yahoo.com>; Date: Fri, 12 Apr 2013 13:44:20 -0700; REPLY: I remember the Ohmite Z-series chokes. That are effective chokes precisely because they are self-resonant around the frequency of their nomenclature, i.e, Z-50 = 50 MHz. They are ok for filter; /archives//html/Amps/2013-04/msg00094.html (7,712 bytes)
5. Re: [Amps] Plate choke explodes (score: 1): Author: "Han Higasa" <higasa@plum.ocn.ne.jp>; Date: Sat, 13 Apr 2013 08:12:34 +0900; Hi all Possibly high RF current on the plate RFC - meaning it has a hole on 50 MHz. I have burnt a plate RFC in my 6m RF deck because of parasitic oscillation around 60 MHz. But 8877 must be quite st; /archives//html/Amps/2013-04/msg00095.html (7,743 bytes)
6. [Amps] Plate choke explodes (score: 1): Author: Drax Felton <draxfelton@me.com>; Date: Fri, 12 Apr 2013 08:26:52 -0400; So I've tried two different plate choke designs on my 6 meter 8877 amp I'm trying to build. Both times the plate chokes have violently exploded as soon as I apply 5 watt or less RF input to the amp.; /archives//html/Amps/2013-04/msg00098.html (7,520 bytes)
7. Re: [Amps] Plate choke explodes (score: 1): Author: Dick NY1E <dick@ny1e.com>; Date: Sat, 13 Apr 2013 09:56:07 -0700 (PDT); I've used an Ohmite Z-50 for a plate choke in my 6M 8877 since 1999, no smoke yet. Dick, NY1E REPLY: I remember the Ohmite Z-series chokes. That are effective chokes precisely because they are self-; /archives//html/Amps/2013-04/msg00099.html (7,889 bytes)
8. Re: [Amps] Plate choke explodes (score: 1): Author: Bill Turner <dezrat1242@yahoo.com>; Date: Sat, 13 Apr 2013 10:15:31 -0700; REPLY: You can't be serious. What ever possessed you to use such a tiny little choke in a legal limit amp? Bill, W6WRT _______________________________________________ Amps mailing list Amps@contestin; /archives//html/Amps/2013-04/msg00100.html (7,435 bytes)
9. Re: [Amps] Plate choke explodes (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Sat, 13 Apr 2013 16:46:44 -0400; There shouldnt be a problem with a Z-50 as they are self resonant around 70 MHz. OTOH they may explode if subject to a shorted tube or a wild parasitic but the 8877 is not a parasitic prone tube in a; /archives//html/Amps/2013-04/msg00101.html (8,932 bytes)
10. Re: [Amps] Plate choke explodes (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Sat, 13 Apr 2013 17:02:24 -0400; I've used an Ohmite Z-50 for a plate choke in my 6M 8877 since 1999, no smoke yet. Dick, NY1E REPLY: You can't be serious. What ever possessed you to use such a tiny little choke in a legal limit am; /archives//html/Amps/2013-04/msg00102.html (9,652 bytes)
11. Re: [Amps] Plate choke explodes (score: 1): Author: Bill Turner <dezrat1242@yahoo.com>; Date: Sat, 13 Apr 2013 14:25:32 -0700; REPLY: You are overlooking resonance. The 1 amp rating will be FAR exceeded if the tank circuit is ever mistuned, i.e., lightly loaded or accidentally connected to the wrong antenna while driven at o; /archives//html/Amps/2013-04/msg00104.html (9,060 bytes)
12. Re: [Amps] Plate choke explodes (score: 1): Author: Drax Felton <draxfelton@gmail.com>; Date: Sat, 13 Apr 2013 17:25:58 -0400; Good question. They market it as a plate choke. Sent from my iPhone _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/; /archives//html/Amps/2013-04/msg00105.html (9,930 bytes)
13. Re: [Amps] Plate choke explodes (score: 1): Author: "Jim Garland" <4cx250b@miamioh.edu>; Date: Sat, 13 Apr 2013 15:28:13 -0600; A couple of thoughts, Drax. First, re the Z-50, as Carl notes, it has a self-resonant frequency of about 70 MHz, with a note on the Ohmite data sheet saying that stray capacitance and external circui; /archives//html/Amps/2013-04/msg00106.html (10,652 bytes)
14. Re: [Amps] Plate choke explodes (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Sat, 13 Apr 2013 18:07:06 -0400; Why not as it is rated at 1A CCS? It may not like it at 2500W out however...... Several HF amps use similar for their "VHF" choke. Carl KM1H REPLY: You are overlooking resonance. The 1 amp rating wi; /archives//html/Amps/2013-04/msg00107.html (10,531 bytes)
15. Re: [Amps] Plate choke explodes (score: 1): Author: "Han Higasa" <higasa@plum.ocn.ne.jp>; Date: Sun, 14 Apr 2013 07:09:36 +0900; Generally small plate RFC can burn with de-tune of the plate circuit Or 1. two different chokes had similar holes on 50 MHz. 2. the tube oscillates with significant power. 3. the tube has troubles su; /archives//html/Amps/2013-04/msg00108.html (10,468 bytes)
16. Re: [Amps] Plate choke explodes (score: 1): Author: Bill Turner <dezrat1242@yahoo.com>; Date: Sat, 13 Apr 2013 15:41:45 -0700; REPLY: The problem with a parallel resonant plate choke is not current THROUGH the choke, it is the "ringing" or "circulating" current WITHIN the choke. That current can be far in excess of the 1 amp; /archives//html/Amps/2013-04/msg00109.html (9,577 bytes)
17. Re: [Amps] Plate choke explodes (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Sat, 13 Apr 2013 20:04:44 -0400; In fact, if the SRF is near 50MHx, you should have very little RF current through the choke. REPLY: The problem with a parallel resonant plate choke is not current THROUGH the choke, it is the "ring; /archives//html/Amps/2013-04/msg00110.html (11,528 bytes)

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