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References: [ +from:ken.d.brown@hawaiiantel.net: 21 ]

Total 21 documents matching your query.

1. [Amps] Cleaning tubes (score: 1)
Author: Ken Brown <ken.d.brown@hawaiiantel.net>
Date: Sun, 13 Jun 2010 12:37:27 -1000
Hi all, I have a bunch of old tubes which have not been stored properly. I want to clean them up before checking filaments and then offering them for sale or trade to hams. I expect this topic must h
/archives//html/Amps/2010-06/msg00176.html (8,223 bytes)

2. [Amps] Chimneys for 3-500 and 4-400, 4-250 (score: 1)
Author: Ken Brown <ken.d.brown@hawaiiantel.net>
Date: Thu, 01 Jul 2010 17:16:48 -1000
I have seen Coleman lantern glass cylinders used as chimneys. If you get the right size, it might work pretty well. They do not have the curved in top to direct the air flow to the anode seal and con
/archives//html/Amps/2010-07/msg00020.html (6,925 bytes)

3. Re: [Amps] Amps Digest, Vol 93, Issue 16 (score: 1)
Author: Ken Brown <ken.d.brown@hawaiiantel.net>
Date: Sat, 11 Sep 2010 15:40:22 -1000
Trying to hot plug or hot unplug a high voltage wire is hazardous whether it is shielded or not. Would not having the return wire (ground, B- or whatever you want to call it) part the same cable inc
/archives//html/Amps/2010-09/msg00098.html (7,274 bytes)

4. Re: [Amps] Amps Digest, Vol 93, Issue 34 (score: 1)
Author: Ken Brown <ken.d.brown@hawaiiantel.net>
Date: Sun, 19 Sep 2010 10:11:46 -1000
Last time I checked, CW dits are one unit length duration, and the spaces between dits within a character are also one unit length. Most keyers these days can have the "weight" adjusted, so that the
/archives//html/Amps/2010-09/msg00223.html (7,371 bytes)

5. Re: [Amps] HV rectifier strings - to bypass or not? (score: 1)
Author: Ken Brown <ken.d.brown@hawaiiantel.net>
Date: Sat, 30 Oct 2010 10:46:26 -1000
I thought the reason for capacitors and resistors paralleled with the series diodes was to help equalize the voltage division across the diodes, and reduce the chances of an unequal voltage division
/archives//html/Amps/2010-10/msg00433.html (7,894 bytes)

6. Re: [Amps] our amplifier in 2010 CQWW (score: 1)
Author: Ken Brown <ken.d.brown@hawaiiantel.net>
Date: Mon, 08 Nov 2010 17:26:51 -1000
Well now lets see: 10 * log (2.5/1.5) = 1.76, so if they were "very loud" they would have had to been doing something very right with their antenna system, or had very good propagation. Less than 2 d
/archives//html/Amps/2010-11/msg00067.html (10,036 bytes)

7. Re: [Amps] our amplifier in 2010 CQWW (score: 1)
Author: Ken Brown <ken.d.brown@hawaiiantel.net>
Date: Mon, 08 Nov 2010 17:30:21 -1000
Does that mean in multi-op club, you get 500 watts per club member? Ken N6KB _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman
/archives//html/Amps/2010-11/msg00068.html (8,307 bytes)

8. Re: [Amps] our amplifier in 2010 CQWW (score: 1)
Author: Ken Brown <ken.d.brown@hawaiiantel.net>
Date: Tue, 09 Nov 2010 18:48:39 -1000
Yes, that is less than +2 dBLegal. Yes is is against the contest rules. Yes it is against the law (in the USA). Driving 60 MPH in a 55 MPH zone is also against the law, and that is why all of you wh
/archives//html/Amps/2010-11/msg00130.html (10,309 bytes)

9. Re: [Amps] source of '3rd harmonic' (score: 1)
Author: Ken Brown <ken.d.brown@hawaiiantel.net>
Date: Sat, 20 Nov 2010 16:20:26 -1000
Hi Dan, Odd harmonics are caused by pretty much the same things as even harmonics, namely distortion. In a push-pull arrangement, which it sounds like your amplifier is (probably most transistor PAs
/archives//html/Amps/2010-11/msg00371.html (9,017 bytes)

10. [Amps] MOVs (score: 1)
Author: Ken Brown <ken.d.brown@hawaiiantel.net>
Date: Thu, 25 Nov 2010 07:53:01 -1000
I don't understand how this can be a useful device. I thought that MOVs were supposed to draw lots of current, instead of letting it got elsewhere causing damage to more expensive and sensitive elec
/archives//html/Amps/2010-11/msg00439.html (7,640 bytes)

11. Re: [Amps] Help identifying tubes (score: 1)
Author: Ken Brown <ken.d.brown@hawaiiantel.net>
Date: Sun, 28 Nov 2010 20:22:26 -1000
They are definitely not 3-500 or 3-400, because those don't have the metal bases. 4-250 don't have fins on the anodes, so would have to be 4-400, unless it is a pentode. You could probably figure tha
/archives//html/Amps/2010-11/msg00536.html (8,293 bytes)

12. Re: [Amps] PI-L Thoughts! (score: 1)
Author: Ken Brown <ken.d.brown@hawaiiantel.net>
Date: Sat, 11 Dec 2010 22:31:03 -1000
You probably do not need to switch in/out the smaller variable capacitor, because it will be an insignificant amount of additional parallel capacitance on the lower frequency bands. You only need to
/archives//html/Amps/2010-12/msg00131.html (8,651 bytes)

13. Re: [Amps] Fan for SB220 (score: 1)
Author: Ken Brown <ken.d.brown@hawaiiantel.net>
Date: Sat, 18 Dec 2010 10:04:03 -1000
This is true, so a black panel between the hot thing (tube) you are trying to keep cool, and a cooler thing ( outside of the cabinet or other lower temperature area) makes sense if radiant cooling i
/archives//html/Amps/2010-12/msg00208.html (9,078 bytes)

14. Re: [Amps] Paint it black (score: 1)
Author: Ken Brown <ken.d.brown@hawaiiantel.net>
Date: Sat, 18 Dec 2010 15:12:30 -1000
Only worked because the tube is at a higher temperature than the transformer. The separating plate stopped the direct radiation from the tube to the transformer, reflected some of the heat back in t
/archives//html/Amps/2010-12/msg00217.html (8,276 bytes)

15. Re: [Amps] Fan for SB220 (score: 1)
Author: Ken Brown <ken.d.brown@hawaiiantel.net>
Date: Sun, 19 Dec 2010 10:43:40 -1000
Radiant heat (which is essentially light, mostly at longer than visible wavelengths) travels from the higher temperature mass ( sun for instance ) to the lower temperature mass (car for instance) A
/archives//html/Amps/2010-12/msg00253.html (12,562 bytes)

16. Re: [Amps] Black heat shields (score: 1)
Author: Ken Brown <ken.d.brown@hawaiiantel.net>
Date: Sun, 19 Dec 2010 10:59:26 -1000
The Smithsonian Submillimeter Array dishes have a special texture to their surface to help scatter IR ( and thus not fry the receiver front end ) while still maintaining a good enough surface qualit
/archives//html/Amps/2010-12/msg00255.html (8,882 bytes)

17. Re: [Amps] Black Heat Shields (score: 1)
Author: Ken Brown <ken.d.brown@hawaiiantel.net>
Date: Sun, 19 Dec 2010 17:09:01 -1000
And the reason that they call it a blackbody is that black bodies do it ( absorb radiation AND reradiate) better than any other color. DE N6KB _______________________________________________ Amps ma
/archives//html/Amps/2010-12/msg00270.html (8,799 bytes)

18. Re: [Amps] TenTec Centurion - 422 tuning question (score: 1)
Author: Ken Brown <ken.d.brown@hawaiiantel.net>
Date: Thu, 23 Dec 2010 14:40:42 -1000
When I first read this I thought " Yeah that is pretty important, I sure hope everyone talking about amplifiers realizes that." Then I thought about it a bit more and realized it is only true if you
/archives//html/Amps/2010-12/msg00328.html (9,701 bytes)

19. [Amps] Amplifier Parts (score: 1)
Author: Ken Brown <ken.d.brown@hawaiiantel.net>
Date: Sun, 30 Jan 2011 11:43:32 -1000
This brings up a good point. Many of the specialized parts for amplifiers that are valuable and hard to find are just junk to a non-ham relative. They often have no idea what these gizmo's are for,
/archives//html/Amps/2011-01/msg00447.html (9,523 bytes)

20. Re: [Amps] what is a 4 wire 240VAC service? (score: 1)
Author: Ken Brown <ken.d.brown@hawaiiantel.net>
Date: Sun, 03 Apr 2011 20:04:56 -1000
Why the requirement for separate ground and neutral wires is reasonable and not just the "result of nanny state busybodies." In a device that runs on 240 VAC the currents in the two hot wires are equ
/archives//html/Amps/2011-04/msg00071.html (9,474 bytes)

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