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1. [Amps] a common topic here tspa (score: 1): Author: "John T. M. Lyles" <jtml@lanl.gov>; Date: Mon, 4 Apr 2005 13:33:45 -0600; There are numerous commercial (HF frequency, ISM) 8877/3CX1500A7 amplifiers on this planel which don't have nor need VHF suppressors around the tube. I have one from RF Power (Plasma) Products which; /archives//html/Amps/2005-04/msg00083.html (7,954 bytes)
2. Re: [Amps] a common topic here tspa (score: 1): Author: "Paul Christensen" <w9ac@arrl.net>; Date: Mon, 4 Apr 2005 16:55:52 -0400; Then, can we agree that the AL-1500 is the only commercially-manufactured multi-band amplifier (2-30MHz) on this planet that uses no parasitic suppressor? -Paul, W9AC _______________________________; /archives//html/Amps/2005-04/msg00088.html (6,998 bytes)
3. Re: [Amps] a common topic here tspa (score: 1): Author: R.Measures <r@somis.org>; Date: Mon, 4 Apr 2005 14:00:11 -0700; As far as I know it is, Paul, Richard L. Measures, AG6K, 805.386.3734. www.somis.org _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/; /archives//html/Amps/2005-04/msg00089.html (7,581 bytes)
4. Re: [Amps] a common topic here tspa (score: 1): Author: "Kenneth D. Grimm, K4XL" <kgrimm@adelphia.net>; Date: Mon, 04 Apr 2005 19:23:04 -0400; Are there any currently manufactured ham band amplifiers using the 8877 which *do* employ a parasitic suppressor? -- Ken K4XL k4xl@arrl.net ** BoatAnchor Manual Archive ** On the web at http://bama.s; /archives//html/Amps/2005-04/msg00092.html (8,203 bytes)
5. Re: [Amps] a common topic here tspa (score: 1): Author: "John Vickers" <wa4tt@nlamerica.com>; Date: Mon, 4 Apr 2005 21:13:04 -0400; Not that I know of Ken. Mine has been used to burn limbs out of trees, load up my metal barn, (when the open wire line decided to weld to it) and work many contest and much DX. Tube date code 1974 an; /archives//html/Amps/2005-04/msg00094.html (7,914 bytes)
6. Re: [Amps] a common topic here tspa (score: 1): Author: "G0RUZ Conrad" <conrad@g0ruz.net>; Date: Tue, 5 Apr 2005 03:09:27 +0100; Its a shame that this forum isn't a web based one where we could have several Stickys (a thread which does not get removed and remains at the top of the page listing). We could have Sticky: gold melt; /archives//html/Amps/2005-04/msg00095.html (9,105 bytes)
7. Re: [Amps] a common topic here tspa (score: 1): Author: R.Measures <r@somis.org>; Date: Tue, 5 Apr 2005 03:01:43 -0700; I don't know. Richard L. Measures, AG6K, 805.386.3734. www.somis.org _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo; /archives//html/Amps/2005-04/msg00097.html (8,992 bytes)
8. Re: [Amps] a common topic here tspa (score: 1): Author: R.Measures <r@somis.org>; Date: Tue, 5 Apr 2005 03:17:09 -0700; My impression is that gold-meltballs are created by UHF oscillations, not by the VHF variety. Conrad -- It's "experts" because the term is the quotation of a person who compiles such a list and puts; /archives//html/Amps/2005-04/msg00098.html (10,215 bytes)
9. Re: [Amps] a common topic here tspa (score: 1): Author: "G0RUZ Conrad" <conrad@g0ruz.net>; Date: Tue, 5 Apr 2005 12:04:23 +0100; Which just goes to show how much notice I take of said subjects these days Conrad _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mai; /archives//html/Amps/2005-04/msg00099.html (9,184 bytes)
10. Re: [Amps] a common topic here tspa (score: 1): Author: "Phil Clements" <philc@texascellnet.com>; Date: Tue, 5 Apr 2005 09:00:12 -0500; When the 8877 first appeared on the ham scene, there were several construction articles in both the ARRL and Bill Orr Handbooks using the tube sans suppressor. If I remember correctly, the W8JR proje; /archives//html/Amps/2005-04/msg00101.html (9,491 bytes)
11. Re: [Amps] a common topic here tspa (score: 1): Author: "Joe Subich, K4IK" <k4ik@subich.com>; Date: Tue, 5 Apr 2005 11:21:24 -0400; In essence, if the 8877 is installed as designed - with the grid grounded directly all the way around with the proper "ring" of finger stock, the tube will not oscillate. If, the grid is grounded usi; /archives//html/Amps/2005-04/msg00102.html (8,151 bytes)
12. Re: [Amps] a common topic here tspa (score: 1): Author: Vic Rosenthal <vic@rakefet.com>; Date: Tue, 05 Apr 2005 09:53:01 -0700; The handbooks describe procedures for checking if an amplifier is stable at VHF. If not, and this of course depends on the layout and components used and the parasitic tank circuits created thereby,; /archives//html/Amps/2005-04/msg00104.html (9,163 bytes)
13. Re: [Amps] a common topic here tspa (score: 1): Author: R.Measures <r@somis.org>; Date: Tue, 5 Apr 2005 10:39:29 -0700; One problem with VHF parasitic suppressors in a HF amp is that the less L-supp one uses, the higher the VHF parallel-equivalent R on the anode and the higher the VHF amplification at the anode's VHF-; /archives//html/Amps/2005-04/msg00105.html (10,878 bytes)
14. Re: [Amps] a common topic here tspa (score: 1): Author: R.Measures <r@somis.org>; Date: Tue, 5 Apr 2005 10:50:15 -0700; They are optional if one isn't paying for 8877s. Richard L. Measures, AG6K, 805.386.3734. www.somis.org _______________________________________________ Amps mailing list Amps@contesting.com http://li; /archives//html/Amps/2005-04/msg00107.html (10,585 bytes)
15. Re: [Amps] a common topic here tspa (score: 1): Author: R.Measures <r@somis.org>; Date: Tue, 5 Apr 2005 11:00:06 -0700; Eimac part #135305 is an 8877 grid-grounding collet. Eimac's development team reported that some 8877s failed from what was apparently an "oscillation condition" during testing. Joe -- Are you sugges; /archives//html/Amps/2005-04/msg00108.html (9,627 bytes)
16. Re: [Amps] a common topic here tspa (score: 1): Author: "Joe Subich, K4IK" <k4ik@subich.com>; Date: Tue, 5 Apr 2005 16:00:27 -0400; As I recall, and it has more than 20 years since I was able to set down with some of the best tube guys at Eimac over beers (while we were taming "experimental" UHF TV transmitters). Since all of us; /archives//html/Amps/2005-04/msg00111.html (9,455 bytes)
17. Re: [Amps] a common topic here tspa (score: 1): Author: R.Measures <r@somis.org>; Date: Wed, 6 Apr 2005 08:48:48 -0700; Of course! The "plate" (anode) resonance is not fixed, instead it varies according to the total lead inductance between the anode (10pF for the 8877) and the Tune-C -- so, no tube has a "plate" reson; /archives//html/Amps/2005-04/msg00128.html (10,522 bytes)
18. Re: [Amps] a common topic here tspa (score: 1): Author: "Joe Subich, K4IK" <k4ik@subich.com>; Date: Wed, 6 Apr 2005 22:19:58 -0400; No, I'm simply saying that the Eimac tube guys that I knew and worked with said a lot of what passes for "truth" is a bunch of nonsense. In their experience, every case of "parasitic problems" in 88; /archives//html/Amps/2005-04/msg00133.html (9,031 bytes)
19. Re: [Amps] a common topic here tspa (score: 1): Author: R.Measures <r@somis.org>; Date: Thu, 7 Apr 2005 01:55:23 -0700; Did the 8877 design team use improper grid-grounding that resulted in the "oscillation condition" they observed that caused gold to evaporate from the grid of the DUT? Richard L. Measures, AG6K, 805.; /archives//html/Amps/2005-04/msg00135.html (9,557 bytes)
20. Re: [Amps] a common topic here tspa (score: 1): Author: Ian White G3SEK <G3SEK@ifwtech.co.uk>; Date: Thu, 7 Apr 2005 11:26:59 +0100; That seems to be conflating two different stories, on the basis of information from an individual Eimac employee which the company subsequently said was incorrect. The "oscillation condition" in ques; /archives//html/Amps/2005-04/msg00137.html (9,386 bytes)

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