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Total 1051 documents matching your query.

61. Re: [Amps] HV Diodes (score: 1)
Author: Louis Parascondola via Amps <amps@contesting.com>
Date: Fri, 17 Oct 2014 09:10:18 -0400
A roller inductor is the last thing you want in a ham amp of desktop size anway. A roller inductor is the last thing you want in a ham amp of desktop size anway. Ulvin Tremendus in Spain has the dual
/archives//html/Amps/2014-10/msg00114.html (11,226 bytes)

62. Re: [Amps] HV Diodes (score: 1)
Author: Louis Parascondola via Amps <amps@contesting.com>
Date: Fri, 17 Oct 2014 09:19:57 -0400
I think Emtron parallels there switch wafers on their DX-4 amplifier which runs a pair of so called 4CX2500's The 3x6 needs 3 wafers in parallel. Why one 3CX3000A7 amp? If one requires more power, li
/archives//html/Amps/2014-10/msg00116.html (9,568 bytes)

63. Re: [Amps] HV Diodes (score: 1)
Author: Glen Zook via Amps <amps@contesting.com>
Date: Fri, 17 Oct 2014 06:43:15 -0700
I have had a Henry/Tempo 2001 linear amplifier, that uses a pair of 8874 tubes, which has a roller inductor, for almost 40-years. No problems! The "plate tuning" in this amplifier is actually uses th
/archives//html/Amps/2014-10/msg00117.html (11,681 bytes)

64. Re: [Amps] Solid State Amps (score: 1)
Author: Louis Parascondola via Amps <amps@contesting.com>
Date: Fri, 17 Oct 2014 20:15:05 -0400
With my limited Yiddish and German I only understand one word in each and those are drek and scheisse which we call in Italian merda As my Yiddish friends from Brooklyn used to say: "velkh a fun drek
/archives//html/Amps/2014-10/msg00142.html (20,069 bytes)

65. Re: [Amps] solid state amps (score: 1)
Author: Bryan Swadener via Amps <amps@contesting.com>
Date: Fri, 17 Oct 2014 17:14:28 -0700
At the world's largest OEM of sealed CO2 Lasers, we used a pair of ARF1500s to push 1KW into a CO2 Laser (100W Laser power). While hams get upset about VSWR of 2:1, from just before ionization to "st
/archives//html/Amps/2014-10/msg00143.html (9,407 bytes)

66. Re: [Amps] Solid State Amps (score: 1)
Author: Bryan Swadener via Amps <amps@contesting.com>
Date: Fri, 17 Oct 2014 19:53:11 -0700
Oops. A tpyo. Make that the Smith Chart, Schmidt Chart... or something like that. ;-) Bryan WA7PRC _______________________________________________ Amps mailing list Amps@contesting.com http://lists.c
/archives//html/Amps/2014-10/msg00149.html (8,386 bytes)

67. Re: [Amps] Ten-Tec Titan 425 - input SWR high (score: 1)
Author: Gerald Williamson via Amps <amps@contesting.com>
Date: Sun, 19 Oct 2014 10:15:25 -0400
Prem, a cathode driven amplifier input impedance (and resulting vswr) is determined by cathode current primarily You can't get enough cathode current flow with a low power rf source such as the MFJ a
/archives//html/Amps/2014-10/msg00184.html (9,725 bytes)

68. [Amps] Fwd: Ten-Tec Titan 425 - input SWR high (score: 1)
Author: Louis Parascondola via Amps <amps@contesting.com>
Date: Sun, 19 Oct 2014 10:15:41 -0400
Usually the input swr on those amps are OK. I have seen some that have issues on different bands. Since the age of the amp is getting up there I would say that maybe the mica caps have drifted off va
/archives//html/Amps/2014-10/msg00185.html (10,868 bytes)

69. Re: [Amps] Fwd: Ten-Tec Titan 425 - input SWR high (score: 1)
Author: Gerald Williamson via Amps <amps@contesting.com>
Date: Sun, 19 Oct 2014 10:21:27 -0400
Prem, if a tube was bad the power output would be much lower than the 1500w you measured. The spectrum analyzer does not have enough drive power, same as the MFJ Analyzer, to test input vswr. The unc
/archives//html/Amps/2014-10/msg00186.html (10,916 bytes)

70. Re: [Amps] Fwd: Ten-Tec Titan 425 - input SWR high (score: 1)
Author: Louis Parascondola via Amps <amps@contesting.com>
Date: Sun, 19 Oct 2014 10:31:12 -0400
It does not take a "bad tube", it only takes a tube that is low in emission to throw off the input match. Obviously the amp input is designed to be matched to tubes that are new. The amp has plenty o
/archives//html/Amps/2014-10/msg00187.html (12,239 bytes)

71. [Amps] MLA2500B on WARC bands (score: 1)
Author: Kathy Bookmiller via Amps <amps@contesting.com>
Date: Sun, 19 Oct 2014 13:36:32 -0700
Hello, A friend offered to sell me his Dentron amp. I had one like it years ago, but before the WARC bands came about. My question is whether it can be used on the WARC bands? With my current old rel
/archives//html/Amps/2014-10/msg00198.html (7,184 bytes)

72. [Amps] WTB model 85 or 88 bandswitch (score: 1)
Author: Jeff Blaine via Amps <amps@contesting.com>
Date: Mon, 20 Oct 2014 16:50:57 -0500
Looking for an 85 or 88 series bandswitch Got either of these in your bone pile, or some extra parts? Contact me directly off list, please. 73/jeff/ac0c www.ac0c.com alpha-charlie-zero-charlie ______
/archives//html/Amps/2014-10/msg00209.html (6,631 bytes)

73. [Amps] Nonlinear Thoughts (score: 1)
Author: Radio WC6W via Amps <amps@contesting.com>
Date: Wed, 22 Oct 2014 08:55:49 -0700
I've been reading through all of the recent solid state amplifier postings and, having been working along similar lines for around a decade, I thought I'd contribute a few data points. After much con
/archives//html/Amps/2014-10/msg00219.html (10,169 bytes)

74. Re: [Amps] Nonlinear Thoughts (score: 1)
Author: Radio WC6W via Amps <amps@contesting.com>
Date: Thu, 23 Oct 2014 12:38:18 -0700
Marv, ** Manfred, Was this decision caused by the voltage-variable capacitances in them, or any other reasons? ** Several reasons. I wanted to run the system at 50 ohms. This required high voltage pa
/archives//html/Amps/2014-10/msg00222.html (20,759 bytes)

75. Re: [Amps] Amps Digest, Vol 142, Issue 49 (score: 1)
Author: Gary Smith via Amps <amps@contesting.com>
Date: Sat, 25 Oct 2014 09:36:02 -0700
Very hard to find, well worth the money for an amp this robust. Bought mine brand new, came with Peter Dahl xformer. Tubes in one box, chassis in another, the PD in a third. As you shop for your new
/archives//html/Amps/2014-10/msg00225.html (10,954 bytes)

76. [Amps] Alpha 8410 using 4CX1500B - why? (score: 1)
Author: Peter Sils via Amps <amps@contesting.com>
Date: Tue, 28 Oct 2014 13:35:00 -0700
I recently acquired a slightly used 8410 (mfg 3/2014). I was surprised to learn it had 4CX1500B tubes rather than the 4CX1000A's. Looking at the RF Concepts website for tubes I notice the price is lo
/archives//html/Amps/2014-10/msg00232.html (7,035 bytes)

77. [Amps] TNX to all that responded!! (score: 1)
Author: Peter Sils via Amps <amps@contesting.com>
Date: Wed, 29 Oct 2014 13:23:22 -0700
I appreciate the time you took to respond to my query! This group is a vast powerhouse of information!! TNX AGN!! 73 Peter KD0AA _______________________________________________ Amps mailing list Amps
/archives//html/Amps/2014-10/msg00238.html (6,661 bytes)

78. [Amps] AL1200 on AM - max carrier? (score: 1)
Author: Tony Brock-Fisher via Amps <amps@contesting.com>
Date: Thu, 30 Oct 2014 07:13:09 -0400
I want to run my AL-1200 on AM for a short stint (2 hours operating time, 50% overall duty cycle). I have tested it at about 225 watts carrier output, and with moderately high duty cycle transmission
/archives//html/Amps/2014-10/msg00248.html (7,136 bytes)

79. Re: [Amps] AL1200 on AM - max carrier? (score: 1)
Author: Robert Logan via Amps <amps@contesting.com>
Date: Thu, 30 Oct 2014 09:16:55 -0500
Thought I might mention the legal limit for AM is 375 watts carrier. Bob. NZ5A Sent from my iPhone Any amp will be inefficient when used as a linear amplifier for AM because as drive is reduced, effi
/archives//html/Amps/2014-10/msg00251.html (10,682 bytes)

80. Re: [Amps] AL1200 on AM - max carrier? (score: 1)
Author: Glen Zook via Amps <amps@contesting.com>
Date: Thu, 30 Oct 2014 19:00:14 +0000 (UTC)
The problem is that "desired communications" is not defined! If the operator desires to have a 40 dB over S-9 (with S-9 defined as a 50 microvolt signal level) at every location, then that operator c
/archives//html/Amps/2014-10/msg00260.html (13,173 bytes)

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