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101. Re: [Amps] Best location for snap in replacement caps for SB200 (score: 1)
Author: R.Measures <r@somis.org>
Date: Sun, 9 Nov 2003 07:56:00 -0800
** Modern elecrolytics have more C per unit volume than the electrolytics of yesteryear. Finding an exact mechanical replacement with the same electrical ratings is not likely. However - more C is O
/archives//html/Amps/2003-11/msg00123.html (7,701 bytes)

102. Re: [Amps] AL-1200 Grid Current - negative? (score: 1)
Author: R.Measures <r@somis.org>
Date: Sun, 9 Nov 2003 07:56:01 -0800
** To find out, remove the tube and fire it up. If the grid current is zero, the chances of the 3cx1200A7 having a filament to grid short are pretty good. However, this is a rare occurence compared t
/archives//html/Amps/2003-11/msg00124.html (7,965 bytes)

103. Re: [Amps] SB220 vote (score: 1)
Author: R.Measures <r@somis.org>
Date: Sun, 9 Nov 2003 07:56:01 -0800
** Nor am I, Mike. However, since the Heath SB-1000 appears to be a semi-clone of the orig. AL-80, methinks that Mr. Alexander should be credited with the design of the SB-1000. cheerz _____________
/archives//html/Amps/2003-11/msg00125.html (9,595 bytes)

104. Re: [Amps] AL-1200 Grid Current - negative? (score: 1)
Author: R.Measures <r@somis.org>
Date: Mon, 10 Nov 2003 03:30:25 -0800
** What is the marked resistance of the 15k-ohm R? Is the meter movement associated with it still good? ** Sounds like it. cheers, Dana _______________________________________________ Amps mailing l
/archives//html/Amps/2003-11/msg00128.html (9,137 bytes)

105. Re: [Amps] SB220/221 - won't load on 80 (score: 1)
Author: R.Measures <r@somis.org>
Date: Mon, 10 Nov 2003 03:30:26 -0800
** not likely. ** the 500pF mica 80m Load padder C sometimes shorts. _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinf
/archives//html/Amps/2003-11/msg00129.html (8,697 bytes)

106. Re: [Amps] AL-1200 Grid Current - negative? (score: 1)
Author: R.Measures <r@somis.org>
Date: Mon, 10 Nov 2003 03:30:25 -0800
** A suddenly open grid-current meter shunt resistor indicates a burst of grid current. Are there glitch-protection diodes across the meter movements? Have you measured the full scale meter I-sensit
/archives//html/Amps/2003-11/msg00130.html (10,397 bytes)

107. RE: [Amps] Getting Back In (score: 1)
Author: R.Measures <r@somis.org>
Date: Mon, 10 Nov 2003 08:32:53 -0800
** Alpha 77s can be easily be moved about in the cargo bay of a Lockheed C5A. _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman
/archives//html/Amps/2003-11/msg00136.html (9,182 bytes)

108. Re: [Amps] 4CX1600B (score: 1)
Author: R.Measures <r@somis.org>
Date: Tue, 11 Nov 2003 07:41:24 -0800
** I would not conclude that the tube arced until an autopsy is done. If you heard a loud bang, it is unlikely that it was caused by an an internal arc since an arc inside the envelope makes only a
/archives//html/Amps/2003-11/msg00150.html (8,278 bytes)

109. Re: [Amps] Re: Getting Back In (score: 1)
Author: R.Measures <r@somis.org>
Date: Tue, 11 Nov 2003 07:41:25 -0800
Amen, Jim. Carrying about an Alpha 77 is definitely "pumping iron". _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/
/archives//html/Amps/2003-11/msg00151.html (8,544 bytes)

110. Re: [Amps] AM-6154 Info Wanted. Experiences, etc? (score: 1)
Author: R.Measures <r@somis.org>
Date: Tue, 11 Nov 2003 07:41:26 -0800
** -- You know your moonbounce is definitely working FB when you can hear splatter. cheers,..Jurgen _______________________________________________ Amps mailing list Amps@contesting.com http://lists
/archives//html/Amps/2003-11/msg00152.html (7,829 bytes)

111. Re: [Amps] how to check grid current (score: 1)
Author: R.Measures <r@somis.org>
Date: Tue, 11 Nov 2003 07:41:25 -0800
** I would start by measuring the full-scale deflection of the grid-I meter with the amp unplugged, and recalibrate the meter if needed. I would do the same thing with the plate/anode meter. - If the
/archives//html/Amps/2003-11/msg00153.html (7,240 bytes)

112. Re: [Amps] 4CX1600B (score: 1)
Author: rlm <r@somis.org>
Date: Tue, 11 Nov 2003 19:04:18 -0800
Hello, Rich, de Rich. ** - - Because an inductor in series with the grid terminating R does three things: the good: 1. Reduces 10m SWR by cancelling grid XC with XL. the bad: 2. Increases level of a
/archives//html/Amps/2003-11/msg00154.html (8,577 bytes)

113. Re: [Amps] 4cx1000 project feedback and thank you (score: 1)
Author: R.Measures <r@somis.org>
Date: Thu, 13 Nov 2003 02:16:47 -0800
** W7GG building an AB1 grid-driven amp instead of a GG amp is something I find considerably disconcerting. _______________________________________________ Amps mailing list Amps@contesting.com http
/archives//html/Amps/2003-11/msg00165.html (10,543 bytes)

114. Re: [Amps] 4CX1600B (score: 1)
Author: R.Measures <r@somis.org>
Date: Thu, 13 Nov 2003 02:16:46 -0800
** I know it's not necessary, Ian, but it's interesting to me and perhaps to some other amp builders, and if you are proved right, it's another feather in your war-bonnet. . ** Wasn't there somethin
/archives//html/Amps/2003-11/msg00166.html (12,220 bytes)

115. Re: [Amps] 4CX1600B (score: 1)
Author: R.Measures <r@somis.org>
Date: Fri, 14 Nov 2003 04:03:21 -0800
? All cathodes are emission-limited. According to Svetlana's characteristic curves, a 4cx1600 will draw c. 3A with 0V on the grid and 350V on the screen. ** Zener ratings should be divided by three,
/archives//html/Amps/2003-11/msg00173.html (9,984 bytes)

116. Re: [Amps] Drake L-7 failure...amp vs L7-PS power supply? (score: 1)
Author: R.Measures <r@somis.org>
Date: Fri, 14 Nov 2003 04:03:22 -0800
** What is the measured resistance of the anode-circuit parasitic suppressor resistors? ** In an L-7, R12 is supposed to be the glitch-R. However, at a minimum it needs to be replaced with a 10 - 15
/archives//html/Amps/2003-11/msg00174.html (10,077 bytes)

117. Re: [Amps] 4CX1600B (score: 1)
Author: R.Measures <r@somis.org>
Date: Fri, 14 Nov 2003 08:23:12 -0800
** Good point, Colin. -- Before doing a tube autopsy, I check things with a high-potential tester to make sure the subject has expired, I was not aware that the big-banger 4cx1600 had been placed ba
/archives//html/Amps/2003-11/msg00180.html (8,262 bytes)

118. Re: [Amps] 4CX1600B (score: 1)
Author: R.Measures <r@somis.org>
Date: Sat, 15 Nov 2003 04:11:34 -0800
** Proved? Power supplies typically don't bang during an overload condition, the output V sags until the circuit breaker opens. ** As is the case with 3-500Z shorts, the hat trick is to find out wha
/archives//html/Amps/2003-11/msg00190.html (13,211 bytes)

119. Re: [Amps] AMERITRON AL-80A (score: 1)
Author: R.Measures <r@somis.org>
Date: Sat, 15 Nov 2003 04:11:36 -0800
** Also, the Heath manual says that 3-500Zs are OK with >500mA. The tube mfg says 400mA max. Of course, for those who have a free supply of tubes ... ... ... ________________________________________
/archives//html/Amps/2003-11/msg00191.html (7,950 bytes)

120. Re: [Amps] Henry 8K geneology (score: 1)
Author: R.Measures <r@somis.org>
Date: Sat, 15 Nov 2003 08:53:19 -0800
** One story went around that production was temporarily halted while a way to improve stability was in the works. Home builders I talked to encountered the same hurdle -- which was forseeable (for
/archives//html/Amps/2003-11/msg00202.html (7,753 bytes)

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