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Total 12 documents matching your query.

1. [Amps] AL-1200 Questions (score: 1)
Author: Dana Roode <K6NR@ARRL.net>
Date: Sat, 22 Nov 2003 09:36:30 -0800
Folks - My AL-1200 repair efforts continue. As you may recall, the parasitic suppresser came unsoldered and I had some sort of oscillation in the grid that took out the grid resistors, a resister in
/archives//html/Amps/2003-11/msg00319.html (7,110 bytes)

2. Re: [Amps] AL-1200 Questions (score: 1)
Author: R.Measures <r@somis.org>
Date: Sat, 22 Nov 2003 20:42:53 -0800
** Not unless you use a string of forward biased Si diodes instead of the zener. . ** the meter accuracy have been compromised. I would check the accuracy with a DMM and a low-V supply. ** 2, parall
/archives//html/Amps/2003-11/msg00329.html (7,719 bytes)

3. Re: [Amps] AL-1200 Questions (score: 1)
Author: Ed Briggs <edbriggs@optonline.net>
Date: Sun, 23 Nov 2003 10:27:08 -0500
The bias is controlled by two zener diodes (controlled by the CW/SSB switch). Does toggling the switch make an appreciable difference in the resting current? Most likely, you have a damaged zener. It
/archives//html/Amps/2003-11/msg00333.html (8,647 bytes)

4. Re: [Amps] AL-1200 Questions (score: 1)
Author: R.Measures <r@somis.org>
Date: Mon, 24 Nov 2003 05:13:21 -0800
** Agreed, but anode(plate) to grid arcs are typically the result of loose gold particles , not a ceramic-metal seal leak. According to Eimac's 8877's development team, gold migration is the result
/archives//html/Amps/2003-11/msg00346.html (9,893 bytes)

5. Re: [Amps] AL-1200 Questions (score: 1)
Author: R.Measures <r@somis.org>
Date: Mon, 24 Nov 2003 09:42:40 -0800
** Gold-evaporation only happens during a VHF or UHF oscillation in tubes with a gold-plated grid. 3cx1200... does not have a gold-plated grid, but in my opinion it can oscillate. . -- Joe Funderber
/archives//html/Amps/2003-11/msg00356.html (7,874 bytes)

6. Re: [Amps] AL-1200 Questions (score: 1)
Author: Bill Turner <wrt@dslextreme.com>
Date: Mon, 24 Nov 2003 08:32:05 -0800
_________________________________________________________ Can you explain the mechanism for this? I'm curious how gold particles could create a quasi-rectifier. -- Bill, W6WRT _______________________
/archives//html/Amps/2003-11/msg00359.html (7,443 bytes)

7. Re: [Amps] AL-1200 Questions (score: 1)
Author: Steve Thompson <g8gsq@qsl.net>
Date: Tue, 25 Nov 2003 10:35:50 +0000
My knowledge of atomic physics is limited, but it strikes me as much more likely that some of the gold balls have cathode material on them. Steve _______________________________________________ Amps
/archives//html/Amps/2003-11/msg00360.html (8,356 bytes)

8. Re: [Amps] AL-1200 Questions (score: 1)
Author: R.Measures <r@somis.org>
Date: Tue, 25 Nov 2003 08:03:28 -0800
** When I see gold meltballs through a microscope, I see no barium oxide or strontium oxide. _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contes
/archives//html/Amps/2003-11/msg00365.html (8,722 bytes)

9. Re: [Amps] AL-1200 Questions (score: 1)
Author: Steve Thompson <g8gsq@qsl.net>
Date: Wed, 26 Nov 2003 17:42:58 +0000
I'd be surprised if it was there in large enough lumps to see. Do you see the effect once the balls are out of the tube? Steve _______________________________________________ Amps mailing list Amps@c
/archives//html/Amps/2003-11/msg00373.html (9,113 bytes)

10. Re: [Amps] AL-1200 Questions (score: 1)
Author: Steve Thompson <g8gsq@qsl.net>
Date: Thu, 27 Nov 2003 11:17:33 +0000
I think they don't need to be. If something delivers enough energy to spray melted gold from the grid everywhere, I reckon that it's highly likely that some cathode material gets sprayed around as we
/archives//html/Amps/2003-11/msg00379.html (9,348 bytes)

11. Re: [Amps] AL-1200 Questions (score: 1)
Author: R.Measures <r@somis.org>
Date: Wed, 26 Nov 2003 22:26:21 -0800
** I can see their spherical shape only with 30 - 50 X magnification. Otherwise, they look like yellowish dust. [see Fig 24 on my Web site]. I can see the cathode coating, but none of it appears to
/archives//html/Amps/2003-11/msg00380.html (10,041 bytes)

12. Re: [Amps] AL-1200 Questions (score: 1)
Author: R.Measures <r@somis.org>
Date: Thu, 27 Nov 2003 08:43:58 -0800
** Could be, however, strontium and barium oxides are definitely visable, and saw none other than on the cathode. ** Most of the gold meltballs I see are not lodged, they're loose and free to move a
/archives//html/Amps/2003-11/msg00384.html (10,240 bytes)

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