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1. [Amps] RF parts and parasitics!! (score: 1): Author: Gudguyham@aol.com; Date: Wed, 26 Aug 2009 07:17:01 EDT; I was just checking prices on new 3-500ZG tubes at the RF parts web site. Interestingly enough right smack at the top of the 3-500z heading for these tubes there is a link to the W8JI web site which; /archives//html/Amps/2009-08/msg00496.html (7,572 bytes)
2. Re: [Amps] RF parts and parasitics!! (score: 1): Author: Gudguyham@aol.com; Date: Wed, 26 Aug 2009 07:20:56 EDT; I am sorry the link is at the bottom of the heading here it is _http://rfparts.com/tubetran.html#3500Z_ (http://rfparts.com/tubetran.html#3500Z) In a message dated 8/26/2009 4:17:47 A.M. Pacific Dayl; /archives//html/Amps/2009-08/msg00497.html (7,797 bytes)
3. Re: [Amps] RF parts and parasitics!! (score: 1): Author: "Bill, W6WRT" <dezrat1242@yahoo.com>; Date: Wed, 26 Aug 2009 09:57:33 -0700; ORIGINAL MESSAGE: REPLY: While I generally agree with W8JI's conclusions, he makes a serious mistake about halfway through the article when he says " When grid current is absent, the grid-to-cathode; /archives//html/Amps/2009-08/msg00498.html (9,801 bytes)
4. Re: [Amps] RF parts and parasitics!! (score: 1): Author: "Bill, W6WRT" <dezrat1242@yahoo.com>; Date: Wed, 26 Aug 2009 10:02:50 -0700; ORIGINAL MESSAGE: REPLY: That's an excellent question. Have you asked them? 73, Bill W6WRT _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contestin; /archives//html/Amps/2009-08/msg00499.html (7,870 bytes)
5. Re: [Amps] RF parts and parasitics!! (score: 1): Author: Jack Shirley <jcshirle@gmail.com>; Date: Wed, 26 Aug 2009 13:08:29 -0400; This is the way it is done on the AL1200 _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps; /archives//html/Amps/2009-08/msg00500.html (10,878 bytes)
6. Re: [Amps] RF parts and parasitics!! (score: 1): Author: "Gary Schafer" <garyschafer@comcast.net>; Date: Wed, 26 Aug 2009 12:54:06 -0500; If drawing a conclusion from a test you must first have the proper test setup with the proper equipment. Using an SWR bridge to determine if the input impedance of the tube is constant is not the rig; /archives//html/Amps/2009-08/msg00502.html (11,475 bytes)
7. Re: [Amps] RF parts and parasitics!! (score: 1): Author: "Bill, W6WRT" <dezrat1242@yahoo.com>; Date: Wed, 26 Aug 2009 11:29:59 -0700; ORIGINAL MESSAGE: REPLY: I disagree. An SWR bridge will indeed show the AVERAGE impedance over the RF cycle, whether drawing grid current or not. W8JI's statement was that when grid current is NOT dr; /archives//html/Amps/2009-08/msg00503.html (8,759 bytes)
8. Re: [Amps] RF parts and parasitics!! (score: 1): Author: "DF3KV" <df3kv@t-online.de>; Date: Wed, 26 Aug 2009 20:41:19 +0200; But the cathode choke still keeps the impedance low 73 Peter If drawing a conclusion from a test you must first have the proper test setup with the proper equipment. Using an SWR bridge to determine; /archives//html/Amps/2009-08/msg00504.html (12,464 bytes)
9. Re: [Amps] RF parts and parasitics!! (score: 1): Author: Bill Fuqua <wlfuqu00@uky.edu>; Date: Wed, 26 Aug 2009 14:50:01 -0400; Grid to Cathode impedance of a tube is the grid to cathode voltage divided by the grid current!!! 73 Bill wa4lav _______________________________________________ Amps mailing list Amps@contesting.com; /archives//html/Amps/2009-08/msg00506.html (13,620 bytes)
10. Re: [Amps] RF parts and parasitics!! (score: 1): Author: TexasRF@aol.com; Date: Wed, 26 Aug 2009 15:04:48 EDT; Bill, you mean for this to apply to grid driven operation, don't you? In cathode driven service it is more like peak cathode voltage divided by peak cathode current. Note peak cathode current in line; /archives//html/Amps/2009-08/msg00507.html (14,530 bytes)
11. Re: [Amps] RF parts and parasitics!! (score: 1): Author: Gudguyham@aol.com; Date: Wed, 26 Aug 2009 16:12:13 EDT; No, and I don't really care. I was just making an observation that's all. Though I did say I "wondered" I don't think I will ask. Perhaps someone might. In a message dated 8/26/2009 10:03:19 A.M. Pac; /archives//html/Amps/2009-08/msg00513.html (8,000 bytes)
12. Re: [Amps] RF parts and parasitics!! (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Wed, 26 Aug 2009 19:48:54 -0400; It is also the way I designed for the pesky Clipperton L which can now run a key down 1200W out on 10M with no instability, red plates or smoking parasitic resistor. However I use a cap at both ends; /archives//html/Amps/2009-08/msg00518.html (8,920 bytes)
13. Re: [Amps] RF parts and parasitics!! (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Wed, 26 Aug 2009 20:09:40 -0400; Perhaps you can assist these tired old eyes. Carl KM1H _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps; /archives//html/Amps/2009-08/msg00520.html (10,369 bytes)
14. Re: [Amps] RF parts and parasitics!! (score: 1): Author: "Bill, W6WRT" <dezrat1242@yahoo.com>; Date: Wed, 26 Aug 2009 17:59:00 -0700; ORIGINAL MESSAGE: REPLY: My tired old eyes read his statement "When grid current is absent, the grid-to-cathode impedance is nearly an open circuit" and paraphrased that as "very high". Did I err? 73; /archives//html/Amps/2009-08/msg00526.html (9,544 bytes)
15. Re: [Amps] RF parts and parasitics!! (score: 1): Author: TexasRF@aol.com; Date: Wed, 26 Aug 2009 21:52:16 EDT; When the grid is grounded for cathode driven operation is there a difference between cathode to grid impedance and cathode to ground impedance? Doesn't seem there would be. 73, K5GW In a message date; /archives//html/Amps/2009-08/msg00528.html (8,659 bytes)
16. Re: [Amps] RF parts and parasitics!! (score: 1): Author: "Fuqua, Bill L" <wlfuqu00@uky.edu>; Date: Wed, 26 Aug 2009 22:04:34 -0400; He is doing an analysis of the circuit. Particularly the transfer function between the plate and the grid. To do this you have to look at the internal impedances of the tube itself. There is capacita; /archives//html/Amps/2009-08/msg00529.html (10,783 bytes)
17. Re: [Amps] RF parts and parasitics!! (score: 1): Author: "Bill, W6WRT" <dezrat1242@yahoo.com>; Date: Wed, 26 Aug 2009 19:09:43 -0700; ORIGINAL MESSAGE: REPLY: Correct, no difference. 73, Bill W6WRT _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps; /archives//html/Amps/2009-08/msg00530.html (8,490 bytes)
18. Re: [Amps] RF parts and parasitics!! (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Wed, 26 Aug 2009 22:26:30 -0400; I d say so since we arent discussing the Super Cathode circuit. Carl KM1H _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/lis; /archives//html/Amps/2009-08/msg00532.html (10,550 bytes)
19. Re: [Amps] RF parts and parasitics!! (score: 1): Author: jeff millar <jeff@wa1hco.net>; Date: Wed, 26 Aug 2009 22:28:40 -0400; I think the statement about grid impedance is true because it refers to a principle of _tube_ operation. The grid does indeed have a high impedance with _respect_ to the cathode without grid current.; /archives//html/Amps/2009-08/msg00533.html (9,750 bytes)
20. Re: [Amps] RF parts and parasitics!! (score: 1): Author: "Bill, W6WRT" <dezrat1242@yahoo.com>; Date: Wed, 26 Aug 2009 21:03:45 -0700; ORIGINAL MESSAGE: REPLY: Pay attention, Carl. We ARE discussing the Super Cathode circuit. Here's the entire paragraph that I quoted one sentence from: "There are obviously major flaws with the super; /archives//html/Amps/2009-08/msg00536.html (10,531 bytes)

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