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Total 75 documents matching your query.

41. Re: [Amps] Tube swap (score: 1)
Author: William Turner <dezrat1242@wildblue.net>
Date: Wed, 29 Jan 2014 18:01:38 -0800
Please keep in mind two things: 1. The AADE meter measures inductance at a very low frequency. At VHF the inductance can be considerably different due to distributed capacitance between windings. The
/archives//html/Amps/2014-01/msg00308.html (16,727 bytes)

42. Re: [Amps] Tube swap (score: 1)
Author: William Turner <dezrat1242@wildblue.net>
Date: Wed, 29 Jan 2014 19:42:55 -0800
I wouldn't say it has "trouble". It is quite accurate, but only at it's relatively low frequency. For higher frequencies or for measuring the inductance of a resistor, you need an impedance analyzer
/archives//html/Amps/2014-01/msg00313.html (8,327 bytes)

43. Re: [Amps] Air temps leaving the amp. (score: 1)
Author: Bill Turner <dezrat1242@wildblue.net>
Date: Mon, 03 Feb 2014 09:43:55 -0800
The important measurement is not exiting air temperature, but rather the temperature of the ceramic to metal seal on the tube, which should not exceed 250 C for that tube. You should get some color-c
/archives//html/Amps/2014-02/msg00031.html (7,756 bytes)

44. Re: [Amps] SB-200 Plate Choke for 6 meters (score: 1)
Author: Bill Turner <dezrat1242@wildblue.net>
Date: Thu, 06 Feb 2014 17:18:44 -0800
ORIGINAL MESSAGE: (may be snipped) REPLY: Actually, you can use the existing tune and load caps if you add the L-network coil as described in any recent ARRL handbook in the amplifiers chapter. I did
/archives//html/Amps/2014-02/msg00050.html (7,359 bytes)

45. Re: [Amps] Umac 606 (score: 1)
Author: Bill Turner <dezrat1242@wildblue.net>
Date: Thu, 13 Feb 2014 09:27:47 -0800
ORIGINAL MESSAGE: (may be snipped) Looks like an interesting and practical tube. Data at: http://www.tubecollectors.org/archives/606.pdf 73, Colin K7FM REPLY: Yes, actually that was my first amplifie
/archives//html/Amps/2014-02/msg00109.html (7,549 bytes)

46. Re: [Amps] Force cooled heatsink aerodynamics (score: 1)
Author: Bill Turner <dezrat1242@wildblue.net>
Date: Fri, 14 Feb 2014 09:20:44 -0800
ORIGINAL MESSAGE: (may be snipped) http://www.farnell.com/datasheets/17645.pdf REPLY: That is interesting. Do you know what the prices are and where to order from? Also, I'm curious how your design p
/archives//html/Amps/2014-02/msg00118.html (7,217 bytes)

47. Re: [Amps] Force cooled heatsink aerodynamics (score: 1)
Author: Bill Turner <dezrat1242@wildblue.net>
Date: Sat, 15 Feb 2014 09:42:06 -0800
ORIGINAL MESSAGE: (may be snipped) I am planning on using TO-220 high voltage switching FETs which are primarily targeted at SMPS use. The drain is connected to the mounting tab. I did look into usin
/archives//html/Amps/2014-02/msg00131.html (8,348 bytes)

48. Re: [Amps] Fan Noise in GS-35b Amplifiers (score: 1)
Author: Bill Turner <dezrat1242@wildblue.net>
Date: Wed, 19 Feb 2014 08:31:48 -0800
ORIGINAL MESSAGE: (may be snipped) REPLY: 100 CFM is a lot of air. You might try slowing the blower down while monitoring the tube seal temperature at full output. The critical points on the tube are
/archives//html/Amps/2014-02/msg00169.html (7,719 bytes)

49. Re: [Amps] Duty cycle for processed SSB in contest conditions? (score: 1)
Author: Bill Turner <dezrat1242@wildblue.net>
Date: Sat, 22 Feb 2014 10:01:47 -0800
ORIGINAL MESSAGE: (may be snipped) REPLY: I would recommend you not try to calculate this, but rather measure it directly. Use color-changing paint or crayon and measure the temperature of the tube s
/archives//html/Amps/2014-02/msg00218.html (7,620 bytes)

50. Re: [Amps] Working on my Darwin award (score: 1)
Author: Bill Turner <dezrat1242@wildblue.net>
Date: Sat, 22 Feb 2014 17:56:08 -0800
ORIGINAL MESSAGE: (may be snipped) Although I spotted the problem before it killed me, this wasn't cool. It also proves that I need a more serious contactor for a HV relay! REPLY: I would suggest bri
/archives//html/Amps/2014-02/msg00225.html (7,270 bytes)

51. Re: [Amps] Working on my Darwin award (score: 1)
Author: Bill Turner <dezrat1242@wildblue.net>
Date: Sat, 22 Feb 2014 21:42:28 -0800
ORIGINAL MESSAGE: (may be snipped) I could see a situation where if the Variac is left at a point just below the relay pull-in threshold, the resistors could bake open, even if they are fused. Paul,
/archives//html/Amps/2014-02/msg00229.html (8,224 bytes)

52. Re: [Amps] Working on my Darwin award (score: 1)
Author: Bill Turner <dezrat1242@wildblue.net>
Date: Sun, 23 Feb 2014 10:53:16 -0800
ORIGINAL MESSAGE: (may be snipped) Paul, W9AC REPLY: Probably the best approach of all. 73, Bill W6WRT _______________________________________________ Amps mailing list Amps@contesting.com http://lis
/archives//html/Amps/2014-02/msg00241.html (8,578 bytes)

53. Re: [Amps] Working on my Darwin award (score: 1)
Author: Bill Turner <dezrat1242@wildblue.net>
Date: Sun, 23 Feb 2014 10:57:30 -0800
One last suggestion for avoiding the Darwin award: Never trust a meter that reads zero. 73, Bill W6WRT _______________________________________________ Amps mailing list Amps@contesting.com http://lis
/archives//html/Amps/2014-02/msg00242.html (8,446 bytes)

54. Re: [Amps] Cool Amp Silver Plating (score: 1)
Author: Bill Turner <dezrat1242@wildblue.net>
Date: Sat, 01 Mar 2014 09:10:02 -0800
ORIGINAL MESSAGE: (may be snipped) REPLY: Interestingly, according to Wikipedia some people can not smell hydrogen cyanide: "HCN has a faint, bitter, almond-like odor that some people are unable to d
/archives//html/Amps/2014-03/msg00005.html (8,090 bytes)

55. Re: [Amps] Cool Amp Silver Plating (score: 1)
Author: Bill Turner <dezrat1242@wildblue.net>
Date: Sat, 01 Mar 2014 11:33:34 -0800
ORIGINAL MESSAGE: (may be snipped) REPLY: Does this reduce heat transfer? 73, Bill W6WRT _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.
/archives//html/Amps/2014-03/msg00009.html (7,225 bytes)

56. Re: [Amps] Commander 2500 Pi Coil Toroid (score: 1)
Author: Bill Turner <dezrat1242@wildblue.net>
Date: Mon, 17 Mar 2014 07:52:31 -0700
ORIGINAL MESSAGE: (may be snipped) REPLY: As did I, twice! A fellow at the factory said the HF-2500 should be limited to 1 kW on 160/80/40 for RTTY contesting. The toroid is not in circuit above 40 s
/archives//html/Amps/2014-03/msg00083.html (7,271 bytes)

57. Re: [Amps] Triband balun (score: 1)
Author: Bill Turner <dezrat1242@wildblue.net>
Date: Mon, 17 Mar 2014 14:40:36 -0700
ORIGINAL MESSAGE: (may be snipped) Any suggestions for a better alternative that will hold up in a RTTY contest? Thanks, Gary KA1J REPLY: I had the same problem many years ago. Hy-Gain made a replace
/archives//html/Amps/2014-03/msg00087.html (7,252 bytes)

58. Re: [Amps] More on Toroidal Tank Circuit Issues (score: 1)
Author: Bill Turner <dezrat1242@wildblue.net>
Date: Fri, 21 Mar 2014 15:15:25 -0700
ORIGINAL MESSAGE: (may be snipped) REPLY: Most likely it is self-resonant around 10 meters. Being unloaded, the circulating current and voltage can build up to very high levels. 73, Bill W6WRT ______
/archives//html/Amps/2014-03/msg00126.html (7,156 bytes)

59. Re: [Amps] WTB chimney (score: 1)
Author: Bill Turner <dezrat1242@wildblue.net>
Date: Mon, 24 Mar 2014 14:12:27 -0700
ORIGINAL MESSAGE: (may be snipped) REPLY: Also check out replacement chimneys for Coleman lanterns. They come in several sizes and of course are heat resistant. Sporting goods stores should carry the
/archives//html/Amps/2014-03/msg00142.html (7,579 bytes)

60. Re: [Amps] parts sales? (score: 1)
Author: Bill Turner <dezrat1242@wildblue.net>
Date: Wed, 26 Mar 2014 12:17:09 -0700
ORIGINAL MESSAGE: (may be snipped) I've never been shorted or scammed, REPLY: I agree with Don. eBay and PayPal's buyer protection is about as good as it gets. I have filed two disputes in 15 years a
/archives//html/Amps/2014-03/msg00167.html (8,236 bytes)

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