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61. Re: [Amps] Ameritron AL-572B (score: 1)
Author: R.Measures <r@somis.org>
Date: Tue, 21 Oct 2003 06:20:05 -0700
** Peter -- Svetlana 572Bs reportedly have more VHF gain than other brands. -- Tetrodes with both grids grounded have very little anode-cathode feedback-C, which should make them more stable than a
/archives//html/Amps/2003-10/msg00208.html (9,906 bytes)

62. Re: [Amps] Future availability of 3cx1200a7 and 3cx1500a7 (score: 1)
Author: rlm <r@somis.org>
Date: Wed, 22 Oct 2003 07:07:47 -0700
** The problem with the 3cx1200A7 (and the 3-1000Z) is that it has roughly 7x as much feedback-C (Anode-cathode C) as an 8877. Although more feedback-C is beneficial in VHF oscillators, it can be a p
/archives//html/Amps/2003-10/msg00213.html (8,689 bytes)

63. Re: [Amps] Zener Diode needed (score: 1)
Author: rlm <r@somis.org>
Date: Wed, 22 Oct 2003 07:13:45 -0700
** In amateur service, it should be virtually impossible to short a 50w 12v zener. Ny guess is that some anomaly caused the zener to short and if this problem is not addressed, the replacement will e
/archives//html/Amps/2003-10/msg00214.html (9,197 bytes)

64. Re: [Amps] Re: Future availability of 3cx1200a7 and 3cx1500a7? (score: 1)
Author: rlm <r@somis.org>
Date: Thu, 23 Oct 2003 22:15:42 -0700
On Thursday, October 23, 2003, at 05:06 PM, Dave Haupt wrote: Ed, The difference between the '1200 and '1500 in feedback capacitance is only 2:1, ** There is apparently a typo in Eimac Catalog 175. T
/archives//html/Amps/2003-10/msg00226.html (11,865 bytes)

65. Re: [Amps] Future availability of 3cx1200a7 and 3cx1500a7 (score: 1)
Author: rlm <r@somis.org>
Date: Fri, 24 Oct 2003 06:52:09 -0700
The 3cx1200A7 is supposedly on Eimac's to-be-discontinued list. Their new 3cx1200Z7 is clearly a superior bottle - unless one is trying to build a 1500w VHF oscillator. On Friday, October 24, 2003, a
/archives//html/Amps/2003-10/msg00231.html (14,031 bytes)

66. Re: [Amps] Re: Future availability of 3cx1200a7 and 3cx1500a7? (score: 1)
Author: rlm <r@somis.org>
Date: Fri, 24 Oct 2003 10:51:16 -0700
On Friday, October 24, 2003, at 09:33 AM, Dave Haupt wrote: Rich, Feedback capacitance is certainly a worthy consideration. To accurately model the potential trouble spots, it needs to be made a part
/archives//html/Amps/2003-10/msg00232.html (17,631 bytes)

67. Re: [Amps] Tuned Input and the MFJ-259B (score: 1)
Author: rlm <r@somis.org>
Date: Sat, 25 Oct 2003 05:50:19 -0700
On Friday, October 24, 2003, at 08:42 AM, Vic Rosenthal wrote: Aargh! I SHOULD have said: You probably know this, but the correct way to do it is to temporarily put a non-inductive resistor equal to
/archives//html/Amps/2003-10/msg00234.html (8,486 bytes)

68. Re: [Amps] VOX Tripping and Bandswitch Damage (score: 1)
Author: rlm <r@somis.org>
Date: Sat, 25 Oct 2003 06:01:50 -0700
On Friday, October 24, 2003, at 06:39 AM, Bill Coleman wrote: Hi Mike, you may be on to something... I am not familiar with the '78, but will relate something I have personally done & seen done by ot
/archives//html/Amps/2003-10/msg00235.html (7,531 bytes)

69. Re: [Amps] FL-2100F (score: 1)
Author: R.Measures <r@somis.org>
Date: Mon, 27 Oct 2003 05:29:44 -0800
** It should not be possible to do this to a 500v mica with normal operation. A glitch seems likely. - R.L. Measures/Rich..., AG6K, 805.386.3734, www.somis.org ______________________________________
/archives//html/Amps/2003-10/msg00256.html (7,417 bytes)

70. Re: [Amps] Tuned Input Trimmer Capacitors (score: 1)
Author: R.Measures <r@somis.org>
Date: Tue, 28 Oct 2003 03:18:18 -0800
** Surely, but the L still needs to be correct in order to arrive at the needed Q of c. 2. - R.L. Measures/Rich..., AG6K, 805.386.3734, www.somis.org _______________________________________________ A
/archives//html/Amps/2003-10/msg00269.html (7,813 bytes)

71. Re: [Amps] FL-2100F/B (score: 1)
Author: R.Measures <r@somis.org>
Date: Tue, 28 Oct 2003 03:24:32 -0800
** Looking at all of the pieces with a magnifing glass? - R.L. Measures/Rich..., AG6K, 805.386.3734, www.somis.org _______________________________________________ Amps mailing list Amps@contesting.co
/archives//html/Amps/2003-10/msg00270.html (15,967 bytes)

72. Re: [Amps] Tuned Input Trimmer Capacitors (score: 1)
Author: R.Measures <r@somis.org>
Date: Tue, 28 Oct 2003 11:14:10 -0800
** L figures into Q, so L can't be just anything if C-in and C-out are adjustable. - R.L. Measures/Rich..., AG6K, 805.386.3734, www.somis.org _______________________________________________ Amps mai
/archives//html/Amps/2003-10/msg00279.html (9,582 bytes)

73. Re: [Amps] About single 4CX250b output power (score: 1)
Author: rlm < <r@somis.org>>
Date: Thu, 30 Oct 2003 04:33:29 -0800
On Wednesday, October 29, 2003, at 01:00 PM, Mike Tubby wrote: -- Original Message -- From: "GGLL" <nagato@arnet.com.ar> To: "Amplificadores Lineales" <amps@contesting.com> Sent: Sunday, October 26,
/archives//html/Amps/2003-10/msg00291.html (10,990 bytes)

74. Re: [Amps] Jennings Vacuum Variable Capacitor (score: 1)
Author: rlm < <r@somis.org>>
Date: Thu, 30 Oct 2003 04:50:15 -0800
On Wednesday, October 29, 2003, at 09:40 AM, Mark Toussaint wrote: Hi; I'm converting an old sb-220 to work on 50mhz. I need a low value tune cap and want to use a Jennings vacuum variable of 2-30pf,
/archives//html/Amps/2003-10/msg00292.html (8,869 bytes)

75. Re: [Amps] Tube Voltage ratings Question (score: 1)
Author: rlm < <r@somis.org>>
Date: Thu, 30 Oct 2003 05:10:23 -0800
On Wednesday, October 29, 2003, at 07:45 PM, John wrote: I have a question to the tubers out there. What determines the Anode voltage rating on a tube ?? ** Tarot cards? Ouija board? It's less than w
/archives//html/Amps/2003-10/msg00298.html (8,922 bytes)

76. Re: [Amps] Jennings Vacuum Variable Capacitor (score: 1)
Author: rlm < <r@somis.org>>
Date: Thu, 30 Oct 2003 06:20:06 -0800
On Thursday, October 30, 2003, at 03:18 AM, Bill Turner wrote: On Wed, 29 Oct 2003 09:40:27 -0800 (PST), Mark Toussaint <n1mt@yahoo.com> wrote: I'm converting an old sb-220 to work on 50mhz. I need a
/archives//html/Amps/2003-10/msg00299.html (9,811 bytes)

77. Re: [Amps] Tuning a 30L-1 (score: 1)
Author: rlm < <r@somis.org>>
Date: Fri, 31 Oct 2003 06:57:59 -0800
** To tune up a 30L-1 for SSB, apply full drive using high speed dits to relieve stress on the PS as well as the delicate 811A plates/anodes. Tune and Load for max relative output. Plate/anode curren
/archives//html/Amps/2003-11/msg00003.html (9,031 bytes)

78. Re: [Amps] H2O cooled tubes (score: 1)
Author: rlm < <r@somis.org>>
Date: Sat, 1 Nov 2003 05:05:59 -0800
On Friday, October 31, 2003, at 12:43 PM, John T. M. Lyles wrote: Oil works too. We use it at work to standoff 90 KV DC for big klystrons, while affording some cooling. We use Shell Diala. Biggest co
/archives//html/Amps/2003-11/msg00012.html (7,251 bytes)

79. [Amps] Globar Type SP Surge Protection resistor (Glitch-R)distributor? (score: 1)
Author: rlm < <r@somis.org>>
Date: Sun, 2 Nov 2003 08:18:28 -0800
** Does anyone know of a Globar distributor who would sell one 200w unit? Thanks. Rich Measures, AG6K, 805.386.3734. www.somis.org/ _______________________________________________ Amps mailing list A
/archives//html/Amps/2003-11/msg00018.html (6,954 bytes)

80. Re: [Amps] 30L1 Tuning (score: 1)
Author: rlm < <r@somis.org>>
Date: Mon, 3 Nov 2003 01:25:34 -0800
On Sunday, November 2, 2003, at 09:48 AM, RFlabnotes@aol.com wrote: I have an old 30L1, which has been in and out of use here for some time. It has also been the cite of several interesting ( and not
/archives//html/Amps/2003-11/msg00023.html (8,619 bytes)


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