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81. Re: [Amps] 3cx1200a7 and 3cx1200z7 datasheets (score: 1)
Author: rlm < <r@somis.org>>
Date: Mon, 3 Nov 2003 01:39:38 -0800
On Sunday, November 2, 2003, at 09:04 AM, Ed Briggs wrote: Does anyone have a 3cx1200a7 datasheet I could have a look at? I am also looking for the z7. ** Ed -- Richardson Electronics in Chicago stoc
/archives//html/Amps/2003-11/msg00024.html (8,131 bytes)

82. Re: [Amps] Ten Tec 425 amp (score: 1)
Author: rlm < <r@somis.org>>
Date: Mon, 3 Nov 2003 05:57:29 -0800
On Monday, November 3, 2003, at 04:40 AM, john naberezny wrote: Hi People, does anyone know if there is a subsitute blower available or how to quiet down this blower? There is a problem on 15 meters(
/archives//html/Amps/2003-11/msg00032.html (8,411 bytes)

83. [Amps] Re: 811 Plate Color/other tube color/Damage (score: 1)
Author: rlm < <r@somis.org>>
Date: Mon, 3 Nov 2003 18:13:07 -0800
On Monday, November 3, 2003, at 04:51 PM, Pat Barthelow wrote: rlm Said: ** The problem is not with the 811A grids, it's melting holes in the 811A plates/anodes due to the increased velocity of elect
/archives//html/Amps/2003-11/msg00033.html (8,018 bytes)

84. Re: [Amps] SB220 (score: 1)
Author: rlm < <r@somis.org>>
Date: Tue, 4 Nov 2003 09:00:13 -0800
On Tuesday, November 4, 2003, at 01:46 AM, ka1xo@juno.com wrote: Dear Morris, The SB-220 should be modified so that it limits the inrush current to the filaments. ** The SB-220 has a current-limiting
/archives//html/Amps/2003-11/msg00045.html (7,726 bytes)

85. Re: [Amps] Anyone ever use a 6C21? (score: 1)
Author: R.Measures <r@somis.org>
Date: Wed, 5 Nov 2003 04:57:30 -0800
A 450TH should do OK in g-g linear service, however, since the Mu is only 38, power gain should be only c. 6 or 7. Thus, it would probably take 200w to drive one to the speed limit. If I were going t
/archives//html/Amps/2003-11/msg00059.html (8,035 bytes)

86. Re: [Amps] Re: SB220 (score: 1)
Author: R.Measures <r@somis.org>
Date: Wed, 5 Nov 2003 04:57:31 -0800
Another solution is to remove the wimpy amp control relay from the radio and replace it with a 300V, 0.5A NPN switch transistor. See diagram in: http://www.somis.org/440.html Search for: "Transistor
/archives//html/Amps/2003-11/msg00060.html (10,127 bytes)

87. Re: [Amps] SB220 (score: 1)
Author: R.Measures <r@somis.org>
Date: Wed, 5 Nov 2003 05:06:28 -0800
** Pete -- Do you start it on the CW position? Does it run from a 20A, 240V circuit? ** the useful emissive life of the 3-500Z cathode is c. 20k-hours at 4.75V and c. 2k-hours at 5.25V. ____________
/archives//html/Amps/2003-11/msg00061.html (8,267 bytes)

88. [Amps] Source for.Shaft Coupler/Adapter? (score: 1)
Author: R.Measures <r@somis.org>
Date: Wed, 5 Nov 2003 11:34:01 -0800
I need to couple a 3/8" roller L tuning shaft to a1/4" shaft on a turns counter, The coupling must be RF-insulated. Does anyone know of a source? Tnx _______________________________________________ A
/archives//html/Amps/2003-11/msg00072.html (6,242 bytes)

89. Re: [Amps] Anyone ever use a 6C21? (score: 1)
Author: R.Measures <r@somis.org>
Date: Thu, 6 Nov 2003 06:27:09 -0800
** A triode with a Mu of 38 is OK for linear service, but only in g-g configuration, However, the drive requirement would be higher than it would be for high-Mu tubes. ______________________________
/archives//html/Amps/2003-11/msg00075.html (8,232 bytes)

90. Re: Fwd: Re: [Amps] Anyone ever use a 6C21? (score: 1)
Author: R.Measures <r@somis.org>
Date: Thu, 6 Nov 2003 06:27:10 -0800
** Bill -- More anode V would have made the 250THs easier to drive -- and provided a better view too. _______________________________________________ Amps mailing list Amps@contesting.com http://lis
/archives//html/Amps/2003-11/msg00076.html (8,097 bytes)

91. Re: [Amps] SB-220 (score: 1)
Author: R.Measures <r@somis.org>
Date: Thu, 6 Nov 2003 06:27:09 -0800
** Unsubstantiated rumour has it that the president of Amp Supply Co., Mr. Dennis Had was observed by his wife, during a surprise visit, doing some activity with his secretary on his desk at work, w
/archives//html/Amps/2003-11/msg00077.html (9,171 bytes)

92. Re: [Amps] SB220 vote (score: 1)
Author: R.Measures <r@somis.org>
Date: Thu, 6 Nov 2003 06:27:10 -0800
** With a stepstart and current-limiting filament transformer, the SB-220 may be switched off and on as often as needed without damage. _______________________________________________ Amps mailing l
/archives//html/Amps/2003-11/msg00078.html (7,033 bytes)

93. Re: [Amps] Anyone ever use a 6C21? (score: 1)
Author: R.Measures <r@somis.org>
Date: Thu, 6 Nov 2003 19:51:55 -0800
** It should work on higher bands too. ** Probably c. 1.5kW PEP out with 200w drive. However, if more drive is available, c. 2800w PEP should be possible (8kV at 600mA in x 60% eff., tuning pulser t
/archives//html/Amps/2003-11/msg00079.html (8,797 bytes)

94. Re: [Amps] SB220 vote (score: 1)
Author: R.Measures <r@somis.org>
Date: Fri, 7 Nov 2003 03:06:36 -0800
** Vic -- If W8JI designed the SB-1000, then who designed the original Amp Supply AL-80? _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.
/archives//html/Amps/2003-11/msg00086.html (7,410 bytes)

95. Re: [Amps] FL-2100F/B (score: 1)
Author: R.Measures <r@somis.org>
Date: Fri, 7 Nov 2003 03:06:37 -0800
** My guess is that the choke has a self-resonance somewhere in the neighborhood of the 572B's anode-circuit resonance. This problem is common in the Henry 2K-4's and 3K-A's HV-RFC where 3-turns occ
/archives//html/Amps/2003-11/msg00087.html (21,571 bytes)

96. Re: [Amps] SB220 vote (score: 1)
Author: R.Measures <r@somis.org>
Date: Fri, 7 Nov 2003 16:09:31 -0800
A healthy 3-500Z has lower IMD than today's crop of transceivers, provided that plate/anode current is <420mA. - R.L. Measures/Rich..., AG6K, 805.386.3734, www.somis.org ____________________________
/archives//html/Amps/2003-11/msg00095.html (9,026 bytes)

97. Re: [Amps] SB220 vote (score: 1)
Author: R.Measures <r@somis.org>
Date: Fri, 7 Nov 2003 16:13:52 -0800
** Amen, Vic. ** Agreed, provided that the plate/anode current is pretty much within the mfg's ratings. . - R.L. Measures/Rich..., AG6K, 805.386.3734, www.somis.org _________________________________
/archives//html/Amps/2003-11/msg00096.html (8,415 bytes)

98. Re: [Amps] Anyone ever use a 6C21? (score: 1)
Author: R.Measures <r@somis.org>
Date: Sat, 8 Nov 2003 05:23:32 -0800
** Barrie -- G-G is the only game in town for a triode linear. Grid-driven is for triodes in Class C. With a Mu in the 30s, G-G gain will be low, but still enough to be worthwhile - especially with a
/archives//html/Amps/2003-11/msg00102.html (10,386 bytes)

99. Re: [Amps] AL-80B reversing its grid current (score: 1)
Author: R.Measures <r@somis.org>
Date: Sat, 8 Nov 2003 05:23:32 -0800
** The likely cause is a bent filament helix. (see Sep.- Oct., 1990 *QST*) When things get hot and expand, the bent filament touches the grid cage and a filament-to-grid short occurs. When the tube
/archives//html/Amps/2003-11/msg00103.html (9,620 bytes)

100. Re: [Amps] SB220 vote (score: 1)
Author: R.Measures <r@somis.org>
Date: Sat, 8 Nov 2003 05:41:27 -0800
** Tnx, Mike. If Bruce Alexander designed the original AL 80 for Dennis Had, and the subsequent SB-1000 is a semi-clone, then how could W8JI have done more than make changes to Alexander's design? __
/archives//html/Amps/2003-11/msg00104.html (8,598 bytes)

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