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201. Re: [Amps] Re: Neutral and ground is in how you use them (was SB-220on 220V) (score: 1)
Author: R.Measures <r@somis.org>
Date: Tue, 9 Dec 2003 04:42:35 -0800
** Yesterday I went to a Home Depot store (here in the United States) and looked at new, mains-entrance circuit-breaker boxes. The neutral and ground terminal strips are machined from the same piece
/archives//html/Amps/2003-12/msg00141.html (9,605 bytes)

202. Re: [Amps] 3-500Z plate durability (score: 1)
Author: R.Measures <r@somis.org>
Date: Tue, 9 Dec 2003 19:11:17 -0800
** The materials used (C or Ta) have a higher melting point than orange-yellow heat. ** Electron movement is "plate"/anode current. ** All thoriated-tungsten tubes gradually loose emission as the ca
/archives//html/Amps/2003-12/msg00162.html (9,436 bytes)

203. Re: [Amps] 3-500Z plate durability (score: 1)
Author: R.Measures <r@somis.org>
Date: Wed, 10 Dec 2003 08:06:05 -0800
** Correct. Reducing filament-V automatically c. 3% during Rx makes economic sense. The amplifier shown in: http://www.somis.org/PBox.top.inside.jpeg has this feature. ** Depends on filament tempera
/archives//html/Amps/2003-12/msg00163.html (10,744 bytes)

204. Re: [Amps] Home Built Amp (score: 1)
Author: R.Measures <r@somis.org>
Date: Thu, 11 Dec 2003 01:01:37 -0800
Is there an available view of the inside? - a diagram? _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps
/archives//html/Amps/2003-12/msg00171.html (7,792 bytes)

205. Re: [Amps] 3-500Z plate durability (score: 1)
Author: R.Measures <r@somis.org>
Date: Thu, 11 Dec 2003 07:47:41 -0800
chimneys)... ** I have observed that the glass-tube cooling system which produces the lowest glass temperature is not the air-sytem socket and chimney, it is the simple split-chassis tranverse fan s
/archives//html/Amps/2003-12/msg00192.html (9,106 bytes)

206. Re: [Amps] Flashover protection (score: 1)
Author: R.Measures <r@somis.org>
Date: Thu, 11 Dec 2003 07:47:42 -0800
** The most important thing is to limit peak discharge current from the HV filter capacitor/s. The most fail-safe way of doing this is with a simple (glitch) resistor in series with the anode supply
/archives//html/Amps/2003-12/msg00193.html (8,603 bytes)

207. Re: [Amps] Home built Amp (score: 1)
Author: R.Measures <r@somis.org>
Date: Thu, 11 Dec 2003 07:47:43 -0800
Sharpies work way better than a 8p nail or a pencil. I think it might be fun to build an amp that looked perfectly horrid on the outside, but which utilized an 8171 to the max on the inside. ________
/archives//html/Amps/2003-12/msg00194.html (8,037 bytes)

208. Re: [Amps] RE: 3-500Z plate durability... (score: 1)
Author: R.Measures <r@somis.org>
Date: Thu, 11 Dec 2003 07:47:43 -0800
** You're right, Todd. When I was a young whippersnapper, John MacDonald, W6SDM, told me that for SSB, it takes c. 10db (1.67 S-units) to make a clearly noticable improvement. Thus, if one runs a pa
/archives//html/Amps/2003-12/msg00195.html (8,236 bytes)

209. Re: [Amps] 4pr-1000b,Y448 tubes (score: 1)
Author: R.Measures <r@somis.org>
Date: Thu, 11 Dec 2003 07:47:41 -0800
** As I understand it, the Y-448 draws slightly more filament current than a 4-1000A, and therefore has more peak emission - which a good thing for pulse service. ____________________________________
/archives//html/Amps/2003-12/msg00196.html (10,956 bytes)

210. Re: [Amps] 3-500Z plate durability (score: 1)
Author: R.Measures <r@somis.org>
Date: Fri, 12 Dec 2003 05:24:08 -0800
** 3-500Zs have no grid-I rating. They have a grid-dissipation rating of 20w -- which can be exceeded (as in glowing grid wires) for brief periods without damage. Grounded-grid/cathode-driven amplif
/archives//html/Amps/2003-12/msg00202.html (10,277 bytes)

211. Re: [Amps] Homebrew solid state amps? (score: 1)
Author: R.Measures <r@somis.org>
Date: Fri, 12 Dec 2003 05:24:09 -0800
** I've seen a Motorola 1200w HF design using two 50V FETs that go for $800 a pair. Efficiency is c. 45% on 10m Terry Gaiser, W6RU, told me that modern broadcast stations use banks of 70vdc p-p FET
/archives//html/Amps/2003-12/msg00203.html (7,903 bytes)

212. Re: [Amps] MLA-2500 question (score: 1)
Author: R.Measures <r@somis.org>
Date: Fri, 12 Dec 2003 05:24:10 -0800
This is probably for zeroing the reflected power indication when a 50-termination is connected to the amplifier. _______________________________________________ Amps mailing list Amps@contesting.com
/archives//html/Amps/2003-12/msg00204.html (7,515 bytes)

213. RE: [Amps] 4pr-1000b,Y448 tubes (score: 1)
Author: R.Measures <r@somis.org>
Date: Fri, 12 Dec 2003 05:24:08 -0800
** Tetrodes with handles emit an erie blue light from the ceramic anode-screen insulator. The blue light process: Those electrons from the cathode that miss the anode, collide into outer-band orbit
/archives//html/Amps/2003-12/msg00205.html (8,905 bytes)

214. Re: [Amps] Resistors (score: 1)
Author: R.Measures <r@somis.org>
Date: Fri, 12 Dec 2003 05:24:10 -0800
** Saad -- Mouser Electronics <www.mouser.com> sells a 2w, 1.0M MOF resistor mfg by Xicon that should handle up to c. 1400v each. The part-number is: 262-1.0M Price is 19-&cent; each-- or a bag of 10
/archives//html/Amps/2003-12/msg00206.html (7,085 bytes)

215. Re: [Amps] ELECTRICAL INSPECTIONS (score: 1)
Author: R.Measures <r@somis.org>
Date: Fri, 12 Dec 2003 09:50:28 -0800
circuit, loaded ** To me the tests that make the most sense require a simple DMM. They are.\: 1. check each outlet for the proper ground, neutral and line potentials. 2. measure the V-drop with a 15
/archives//html/Amps/2003-12/msg00213.html (9,110 bytes)

216. Re: [Amps] 3-500Z plate durability (score: 1)
Author: R.Measures <r@somis.org>
Date: Fri, 12 Dec 2003 10:19:35 -0800
** Grid-I is usually defined as average indicated current on a typical meter. A system for measuring actual dissipation would be considerably more complex. In any case, grid-dissipation is not a pro
/archives//html/Amps/2003-12/msg00214.html (9,295 bytes)

217. Re: [Amps] MLA-2500 Relay too loud! (score: 1)
Author: R.Measures <r@somis.org>
Date: Sat, 13 Dec 2003 02:21:01 -0800
** A vacuum-relay makes a noticable noise when mounted direct to the chassis due to sound conduction - sort of like the sound-bridge on a violin. - For quieter vacuum-relay mounting see: http://www.s
/archives//html/Amps/2003-12/msg00235.html (8,115 bytes)

218. [Amps] Helper Update (score: 1)
Author: R.Measures <r@somis.org>
Date: Sat, 13 Dec 2003 07:52:56 -0800
Karina, the original helper-girl who handled suppressor retrofit-kit mail orders was married in June, 2003. She started doing this job in 1988 when she was in 8th-Grade. After graduating from high-sc
/archives//html/Amps/2003-12/msg00236.html (6,976 bytes)

219. Re: [Amps] MLA-2500 Relay too loud! (score: 1)
Author: R.Measures <r@somis.org>
Date: Sat, 13 Dec 2003 17:05:42 -0800
** Yes, but stock relays are too slow for modern radios, because they cause hot-switching. Yes, through a thin Cu ribbon to prevent sound conduction. cheerz, Don ____________________________________
/archives//html/Amps/2003-12/msg00237.html (9,178 bytes)

220. Re: [Amps] AL-1200 Resting Current (score: 1)
Author: R.Measures <r@somis.org>
Date: Sat, 13 Dec 2003 17:05:41 -0800
** A shorted zener raises the ZSAC. would measure the filament CT to ground V to see what's what. cheers, Dana _______________________________________________ Amps mailing list Amps@contesting.com h
/archives//html/Amps/2003-12/msg00238.html (8,440 bytes)

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