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121. Re: [Amps] 4CX1600B (score: 1)
Author: R.Measures <r@somis.org>
Date: Sat, 15 Nov 2003 08:53:19 -0800
** ... which indicates that a more capable R is in order. How many Joules is available during an arc? ** it is. I've also seen fuses explode and send glass schrapnel about. ** Good question. A high-
/archives//html/Amps/2003-11/msg00203.html (10,777 bytes)

122. Re: [Amps] Benefits of 3-phase power? (score: 1)
Author: R.Measures <r@somis.org>
Date: Sun, 16 Nov 2003 01:56:40 -0800
** Three-phase makes life easier even at 1.5kW. Single-phase just means more effort and filter-C is required. Also, mode makes a big difference. For 24/7 broadcasting, three-phase is clearly the way
/archives//html/Amps/2003-11/msg00208.html (8,070 bytes)

123. Re: [Amps] 4CX1600B - Bangs (score: 1)
Author: R.Measures <r@somis.org>
Date: Sun, 16 Nov 2003 01:56:40 -0800
** Does/did Svetlana gold-plate the grid in the 4cx800 and 4cx1600? ** Nor did I until an old timer (W7MOI) suggested that I measure the resistance of the parasite suppressor resistor in an amplifie
/archives//html/Amps/2003-11/msg00209.html (9,516 bytes)

124. Re: [Amps] Real power from GU74b? (score: 1)
Author: R.Measures <r@somis.org>
Date: Sun, 16 Nov 2003 01:56:41 -0800
** Richard -- Much depends on mode. 400w output in RTTY service is different than 400w-PEP out in SSB. _______________________________________________ Amps mailing list Amps@contesting.com http://li
/archives//html/Amps/2003-11/msg00210.html (6,879 bytes)

125. Re: [Amps] Bleeder Resistor Qusetion (score: 1)
Author: R.Measures <r@somis.org>
Date: Sun, 16 Nov 2003 18:31:03 -0800
** With a resonant-choke filter, enough bleeder current must flow to keep the output V from soaring during RX. With a capacitor filter, bleeder current does not improve V-regulation, however, the bl
/archives//html/Amps/2003-11/msg00221.html (7,961 bytes)

126. Re: [Amps] L-7 Failure, HV fuses (score: 1)
Author: R.Measures <r@somis.org>
Date: Sun, 16 Nov 2003 18:31:02 -0800
** 2" of #30 Cu has about 0.017-ohms of R. Since the ESR of high-ripple I 450V electrolytics is c. 0.25-ohms each, in a typical 3200VDC anode supply, the peak discharge I would be 3200V / [(8 x 0.25
/archives//html/Amps/2003-11/msg00222.html (8,375 bytes)

127. Re: [Amps] Tentec Titan Vacuum Relay Question (score: 1)
Author: R.Measures <r@somis.org>
Date: Mon, 17 Nov 2003 01:59:00 -0800
** Chuck -- I would be interested trying to figure out what caused the relay to hotswitch and fuse the contacts. Is this a ceramic relay about the size of a ping-pong ball? __________________________
/archives//html/Amps/2003-11/msg00229.html (7,150 bytes)

128. RE: [Amps] Benefits of 3-phase power? (score: 1)
Author: R.Measures <r@somis.org>
Date: Mon, 17 Nov 2003 01:59:02 -0800
** Single-phase works semi-OK - provided the mains ESR is low enough to do the job at hand, and the amplifier builder does his/her homework. However, the newer-design compact electrolytics make life
/archives//html/Amps/2003-11/msg00230.html (9,151 bytes)

129. Re: [Amps] Bleeder Resistor Qusetion (score: 1)
Author: R.Measures <r@somis.org>
Date: Tue, 18 Nov 2003 03:21:17 -0800
^^ There must have been a lot of L in the filter cap. What was the bleeder resistance, Bill? _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contes
/archives//html/Amps/2003-11/msg00246.html (8,198 bytes)

130. Re: [Amps] tube replacement ? (score: 1)
Author: R.Measures <r@somis.org>
Date: Tue, 18 Nov 2003 03:21:18 -0800
** The 4-400A and the 3-500Z use the same 5V/14.5A cathode and have the same peak-emission (c. 1.3A) , thus, the output Z of a 4-400A and a 3-500Z are pretty much the same if the anode supply potent
/archives//html/Amps/2003-11/msg00247.html (8,667 bytes)

131. RE: [Amps] Benefits of 3-phase power? (score: 1)
Author: R.Measures <r@somis.org>
Date: Tue, 18 Nov 2003 03:21:19 -0800
Aluminum wire works OK if one uses connectors that are specifically designed for that purpose. and the aluminum wire-gauge is c. two gauges heavier than would be used for copper wiring. In the Unite
/archives//html/Amps/2003-11/msg00248.html (11,498 bytes)

132. Re: [Amps] tube replacement ? (score: 1)
Author: R.Measures <r@somis.org>
Date: Tue, 18 Nov 2003 17:00:04 -0800
** Applying screen V to a tetrode with both grids RF-grounded does not change the amplification because screen-amplification only occurs when the the grid's RF potential differs from that on the scr
/archives//html/Amps/2003-11/msg00255.html (10,384 bytes)

133. [Amps] Looking ror: 2000pF @5kV vacuum variable: (score: 1)
Author: R.Measures <r@somis.org>
Date: Tue, 18 Nov 2003 17:06:08 -0800
I need a source that stocks such. tnx -- Yeah, yeah, I know I said I was through building amplifiers. _______________________________________________ Amps mailing list Amps@contesting.com http://list
/archives//html/Amps/2003-11/msg00256.html (6,702 bytes)

134. Re: [Amps] Benefits of 3-phase power? (score: 1)
Author: R.Measures <r@somis.org>
Date: Wed, 19 Nov 2003 07:12:46 -0800
California imports hydro-power from the North with a 1,000,000VDC, center-tap grounded transmission line. In Sylmar, there's a rather largish DC to AC inverter. ... _________________________________
/archives//html/Amps/2003-11/msg00277.html (8,372 bytes)

135. Re: [Amps] Benefits of 3-phase power? (score: 1)
Author: R.Measures <r@somis.org>
Date: Wed, 19 Nov 2003 07:12:45 -0800
** Small stuff runs on 230v single-phase, big stuff runs on 400v three-phase. _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailma
/archives//html/Amps/2003-11/msg00278.html (9,092 bytes)

136. Re: [Amps] Care and Feeding of Power Grid Tubes, 5th Edition now (score: 1)
Author: R.Measures <r@somis.org>
Date: Wed, 19 Nov 2003 07:12:46 -0800
** John: Did CPI/Eimac abandon the term "plate" and switch to "anode" like the rest of this planet? tnx _______________________________________________ Amps mailing list Amps@contesting.com http://l
/archives//html/Amps/2003-11/msg00279.html (7,817 bytes)

137. Re: [Amps] Ten Tec 425 titan (score: 1)
Author: R.Measures <r@somis.org>
Date: Wed, 19 Nov 2003 07:12:47 -0800
** No cap is necessary, but 100 - 300 pF would help to attenuate harmonics in the VHF region. ** The chain of events: Loose gold meltballs which evaporated from the gold-plated molybdneum grid cause
/archives//html/Amps/2003-11/msg00280.html (9,212 bytes)

138. Re: [Amps] tube replacement ? (score: 1)
Author: R.Measures <r@somis.org>
Date: Wed, 19 Nov 2003 08:32:25 -0800
close to ** With the screen at RF-ground, there is no RF potential on the screen. RF-ground can be either connecting the screen direct to chassis-gnd (tetrodes with handles), or bypassing the screen
/archives//html/Amps/2003-11/msg00281.html (12,648 bytes)

139. Re: [Amps] Fw: Parts needed for Drake L-7 amp (score: 1)
Author: R.Measures <r@somis.org>
Date: Thu, 20 Nov 2003 04:36:02 -0800
** 3-500Zs can be driven into the distortion region (above 1.3A-peak anode current) - but overdrive does not make things blow up - nor does it harm the cathode like it does in heater-type tubes. **
/archives//html/Amps/2003-11/msg00291.html (9,980 bytes)

140. Re: [Amps] AC or DC better for indirectly heated cathodes? (score: 1)
Author: R.Measures <r@somis.org>
Date: Thu, 20 Nov 2003 04:36:01 -0800
** True, but there is no reason to limit inrush-current to heater-type tubes. _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailma
/archives//html/Amps/2003-11/msg00292.html (8,685 bytes)

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