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Total 9 documents matching your query.

1. [Amps] HV Turn On Delay (score: 1): Author: Mike <k4gmh@arrl.net>; Date: Tue, 26 Sep 2006 23:34:16 -0400; Hello, Planning on using a single power supply for two GS35-B amplifiers. Only one amp. will control the HV power supply. This amp. has a three minute delay from the time the filament applied before; /archives//html/Amps/2006-09/msg00316.html (6,520 bytes)
2. Re: [Amps] HV Turn On Delay (score: 1): Author: "Phil Clements" <philc@texascellnet.com>; Date: Wed, 27 Sep 2006 00:08:04 -0500; The Alpha 77DX/SX and others bring up the HV when the a.c. mains switch is activated. The timers are on the PTT line. Other manufacturers go to a lot of extra expense and circuitry to withhold the H; /archives//html/Amps/2006-09/msg00317.html (6,939 bytes)
3. Re: [Amps] HV Turn On Delay (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Wed, 27 Sep 2006 08:07:35 +0100; As I understand it, the danger is drawing current before the cathode is fully heated up - if you do, all the current flows out of the spots that are hottest, and this can mean the current density is; /archives//html/Amps/2006-09/msg00318.html (6,773 bytes)
4. Re: [Amps] HV Turn On Delay (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Wed, 27 Sep 2006 04:41:51 -0400; Mike, Whenever cathode current demand exceeds emission capability for the cathode operating temperature or surface area, the cathode can be chemically poisoned. This is why indirectly-heated tubes o; /archives//html/Amps/2006-09/msg00319.html (9,378 bytes)
5. Re: [Amps] HV Turn On Delay (score: 1): Author: Vic K2VCO <vic@rakefet.com>; Date: Wed, 27 Sep 2006 08:17:09 -0700; I believe that a similar issue can arise with directly-heated cathodes, although the delay is much shorter. I had a 3-500Z amplifier with a step start arrangement that took about 1 second to apply fu; /archives//html/Amps/2006-09/msg00322.html (8,257 bytes)
6. Re: [Amps] HV Turn On Delay (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Wed, 27 Sep 2006 11:34:17 -0400; I've never heard of that problem. Thoriated tungsten tubes are not subject to these problems Vic. They can tolerate much higher anode voltages and be operated with full emission saturation without d; /archives//html/Amps/2006-09/msg00324.html (8,802 bytes)
7. Re: [Amps] HV Turn On Delay (score: 1): Author: "George Watson" <watson@sierracmp.com>; Date: Wed, 27 Sep 2006 09:37:32 -0600; Thankfully, it was not a Pinto. 73 de K0IW George _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps; /archives//html/Amps/2006-09/msg00325.html (7,328 bytes)
8. Re: [Amps] HV Turn On Delay (score: 1): Author: john.brewer@us.schneider-electric.com; Date: Wed, 27 Sep 2006 13:25:26 -0400; Good idea, but not possible with GS35-B ! John K5MO _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps; /archives//html/Amps/2006-09/msg00326.html (7,416 bytes)
9. Re: [Amps] HV Turn On Delay (score: 1): Author: "Phil Clements" <philc@texascellnet.com>; Date: Wed, 27 Sep 2006 13:26:16 -0500; Sure it's possible; take a crash course in Russian and call them up! The consensus on this thread, and also my opinion is that as long as the tube(s) are hard-biased and cannot draw current, no harm; /archives//html/Amps/2006-09/msg00327.html (8,090 bytes)

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