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61. [AMPS] parasitic suppressors (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Thu, 11 Dec 1997 22:03:58 +0000; It doesn't matter which individuals first wrote the bulletin, commented on the draft, authorized its release and so on... You have to accept that the statements in the Application Bulletin as publish; /archives//html/Amps/1997-12/msg00231.html (9,591 bytes)
62. [AMPS] parasitic suppressors (score: 1): Author: km1h@juno.com (km1h @ juno.com); Date: Thu, 11 Dec 1997 18:24:14 EST; A statement that needed to be made Ian.....Thanks. 73 CArl KM1H -- FAQ on WWW: http://www.contesting.com/ampfaq.html Submissions: amps@contesting.com Administrative requests: amps-REQUEST@contesting.; /archives//html/Amps/1997-12/msg00236.html (10,345 bytes)
63. [AMPS] parasitic suppressors (score: 1): Author: km1h@juno.com (km1h @ juno.com); Date: Thu, 11 Dec 1997 18:09:19 EST; A dance again Rich? That was not what I asked OR the parameters. Lets just stick to two amps for now...the SB-220 and the TL-922 which both use grid chokes. Is that too much of a requirement to keep; /archives//html/Amps/1997-12/msg00237.html (10,674 bytes)
64. [AMPS] parasitic suppressors (score: 1): Author: km1h@juno.com (km1h @ juno.com); Date: Thu, 11 Dec 1997 18:24:14 EST; Ian, actual measurement may be an incredibly difficult task but I would suggest that viewing on instruments is not insurmountable. I would be hard pressed to believe that real RF engineers at real co; /archives//html/Amps/1997-12/msg00238.html (11,460 bytes)
65. [AMPS] parasitic suppressors (score: 1): Author: measures@vc.net (Rich Measures); Date: Fri, 12 Dec 97 04:20:47 -0800; agreed I accept that the statements came from someone in the company. However, I do not accept the idea that 4 watt-seconds can damage 5 to 25 watt continuous rated grids. Rich... R. L. Measures, 80; /archives//html/Amps/1997-12/msg00240.html (9,564 bytes)
66. [AMPS] parasitic suppressors (score: 1): Author: measures@vc.net (Rich Measures); Date: Fri, 12 Dec 97 04:21:00 -0800; amen, Ian - If one suspects a gas arc was responsible for the 'big bang', and one finds gas in the tube, it seems likely that there was a gas arc. However, if there is no gas in the tube, maybe ther; /archives//html/Amps/1997-12/msg00242.html (10,350 bytes)
67. [AMPS] parasitic suppressors (score: 1): Author: measures@vc.net (Rich Measures); Date: Fri, 12 Dec 97 04:21:21 -0800; Amen, Bob. In one breath, the naysayers cite Eimac's lengthy production of defective 8877s, and in the next breath they say not to question statements on Eimac stationary -- even though such stateme; /archives//html/Amps/1997-12/msg00244.html (10,355 bytes)
68. [AMPS] parasitic suppressors (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Fri, 12 Dec 1997 08:49:02 +0000; No, of course not - for example, I argue strongly against EIMAC's recommendations for "linear" operating condx for the 4CX250R. But if the company disgrees with me, I don't try to isolate individual; /archives//html/Amps/1997-12/msg00245.html (9,944 bytes)
69. [AMPS] parasitic suppressors (score: 1): Author: philk5pc@connect.net (Phil Clements); Date: Fri, 12 Dec 1997 08:06:27 -0600; I also think that one can safely assume that Eimac determined by TEST, not a paper assumption based on other unrelated tube specs that a 50 volt >5 Joule arc in a 3-500Z or 8877 will cause permanent; /archives//html/Amps/1997-12/msg00246.html (11,612 bytes)
70. [AMPS] parasitic suppressors (score: 1): Author: philk5pc@connect.net (Phil Clements); Date: Fri, 12 Dec 1997 08:06:24 -0600; Snip..... Gas arcs are still a mystery to me. Perhaps the chemists on the reflector can tell us what the make-up of the gas is in a tube, and if an arc would change its properties, or eliminate it al; /archives//html/Amps/1997-12/msg00247.html (9,835 bytes)
71. [AMPS] parasitic suppressors (score: 1): Author: measures@vc.net (Rich Measures); Date: Fri, 12 Dec 97 08:36:02 -0800; There are no smallish wires in the the grid of an 8877. There are 100+ rectangular bars. At Eimac's maximum ratings of 4000v and 250MHz, the grid of an 8877 carries over 40 RMS amperes. // There are; /archives//html/Amps/1997-12/msg00253.html (10,618 bytes)
72. [AMPS] parasitic suppressors (score: 1): Author: measures@vc.net (Rich Measures); Date: Fri, 12 Dec 97 08:36:06 -0800; Which are? However, would it matter whether the person who disagres with you works in Eimac's engineering department or works in the marketing department? Anybody who makes questionable statements i; /archives//html/Amps/1997-12/msg00254.html (10,684 bytes)
73. [AMPS] parasitic suppressors (score: 1): Author: km1h@juno.com (km1h @ juno.com); Date: Fri, 12 Dec 1997 14:46:28 EST; I suspect what is missed here is that the Eimac recomendations in spec sheets, etc are strictly a guide line for competent users; there is nothing that says this or that MUST be used. They give you t; /archives//html/Amps/1997-12/msg00259.html (12,483 bytes)
74. [AMPS] parasitic suppressors (score: 1): Author: philk5pc@connect.net (Phil Clements); Date: Fri, 12 Dec 1997 13:59:07 -0600; Great to hear that, Rich! Most of my amps are 8877's so I have a broad cushion with the 4 Joule limited anode supply. It was not the intent of the Eimac paper to cover each tube type individually. Th; /archives//html/Amps/1997-12/msg00260.html (9,898 bytes)
75. [AMPS] parasitic suppressors (score: 1): Author: measures@vc.net (Rich Measures); Date: Fri, 12 Dec 97 20:52:14 -0800; I run a pair of 4cx250Rs at the max. ratings on 2m SSB. The anode supply is around 2400v, and the screen is regulated by a 400V zener string. With 10w of drive the gain is 20db. There is zero grid c; /archives//html/Amps/1997-12/msg00264.html (9,565 bytes)
76. [AMPS] parasitic suppressors (score: 1): Author: measures@vc.net (Rich Measures); Date: Fri, 12 Dec 97 20:52:10 -0800; This is starting to sound like guess work, Phil, not anything based on scientific measurements. - - We have a tube that has a 25 watt-continuous rated grid which is designed to carry 40A of grid cur; /archives//html/Amps/1997-12/msg00265.html (10,828 bytes)
77. [AMPS] parasitic suppressors (score: 1): Author: philk5pc@connect.net (Phil Clements); Date: Sat, 13 Dec 1997 00:39:53 -0600; Small is a very general term...compared to what? With > 4 Joules @ 50 volts flowing, small Eimac tube wires are small enough to be zapped, according to Eimac. "Thoriated tungsten filaments are capabl; /archives//html/Amps/1997-12/msg00266.html (12,758 bytes)
78. [AMPS] parasitic suppressors (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Sat, 13 Dec 1997 09:23:53 +0000; EIMAC Application Bulletin #17 applies the 4J limit to "oxide cathode tube types up to about 1500 watts plate dissipation". That puts the 8877 right on the borderline. No doubt it is much more capabl; /archives//html/Amps/1997-12/msg00271.html (11,493 bytes)
79. [AMPS] parasitic suppressors (score: 1): Author: measures@vc.net (Rich Measures); Date: Sat, 13 Dec 97 09:24:25 -0800; - You could take a look and decide for yourself. If you don't have an 8877 grid handy, say so and I will mail you one. The choices are heat-dam shorted grid, and gold-sputtered grid. The wires look; /archives//html/Amps/1997-12/msg00273.html (13,379 bytes)
80. [AMPS] parasitic suppressors (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Tue, 16 Dec 1997 11:30:20 +0000; Still searching for an explanation why an anode-grid arc might blow the cathode zener, something might have come up from an off-list exchange with K5GW (reproduced here with permission). No - and may; /archives//html/Amps/1997-12/msg00308.html (13,151 bytes)

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