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Total 421 documents matching your query.

221. Re: [Amps] Amps Digest, Vol 29, Issue 10 .... eBay bidding. (score: 1)
Author: "Harold B. Mandel" <ka1xo@juno.com>
Date: Wed, 4 May 2005 21:04:37 -0400
Dear John, Oftentimes, financial situations deteriorate for older folks and liquidation of ham gear becomes a sad but necessary step for families to keep going. There are pieces of equipment I treasu
/archives//html/Amps/2005-05/msg00069.html (7,445 bytes)

222. Re: [Amps] Air (score: 1)
Author: "Harold B. Mandel" <ka1xo@juno.com>
Date: Fri, 6 May 2005 19:36:30 -0400
Dear Will, Running a small machine shop means having compressed air available. I use a contractor-type, 1-1/2 HP with a dual reserve tank that gets me around 125PSI. I use quick-disconnect fittings (
/archives//html/Amps/2005-05/msg00121.html (7,780 bytes)

223. [Amps] Type 813 BP Pentode (score: 1)
Author: "Harold B. Mandel" <ka1xo@juno.com>
Date: Sun, 8 May 2005 08:49:25 -0400
Gentlemen, Someone asked me to put together a quote for building them a four tube type 813 amplifier, and I wonder if any of you could direct me to a source of practical schematics so I don't reinven
/archives//html/Amps/2005-05/msg00133.html (6,621 bytes)

224. [Amps] Gas Regulator Tubes (score: 1)
Author: "Harold B. Mandel" <ka1xo@juno.com>
Date: Sun, 15 May 2005 16:29:27 -0400
In researching a "retro" amplifier design for a collector who would like to commission a tube amplifier project, the possibility of using 0D3 type cold-cathode gas regulators came up in conversation.
/archives//html/Amps/2005-05/msg00186.html (6,485 bytes)

225. [Amps] OT, but scholarly Request (score: 1)
Author: "Harold B. Mandel" <ka1xo@juno.com>
Date: Sat, 21 May 2005 08:17:34 -0400
Gentlemen, A dear friend at Cornell asked me the other day if I knew the average or particular sensitivity of cellular telephone sets, either in microvolts or decibels. Aside from setting up a Farada
/archives//html/Amps/2005-05/msg00237.html (7,291 bytes)

226. [Amps] Fw: TRANSFORMER-TEST (score: 1)
Author: "Harold B. Mandel" <ka1xo@juno.com>
Date: Sun, 12 Jun 2005 15:23:23 -0400
Dear Ken, You did a great job in investigating the transformer! Let's see: My PWD monster that took three tries to get right from Peter is 12" high by 11" wide by 10 inches across, and weighs 167 pou
/archives//html/Amps/2005-06/msg00075.html (9,443 bytes)

227. [Amps] Alpha to Omega (score: 1)
Author: "Harold B. Mandel" <ka1xo@juno.com>
Date: Thu, 16 Jun 2005 06:30:55 -0400
What good does gold plating do at HF frequencies? Matter-of-fact, what good does silver plating tank components do at HF frequencies? I looked at the photo, in close-up, of the Omega. The air-variabl
/archives//html/Amps/2005-06/msg00115.html (6,731 bytes)

228. Re: [Amps] Alpha service (score: 1)
Author: "Harold B. Mandel" <ka1xo@juno.com>
Date: Sun, 19 Jun 2005 09:05:35 -0400
Dear Bob, There are members of this group who were principal factors at Alpha through the years, and each of them, with their glorious visions, made Alpha the true king of R.F. Amplifiers. I've owned
/archives//html/Amps/2005-06/msg00143.html (8,375 bytes)

229. Re: [Amps] Alpha Service Redux (score: 1)
Author: "Harold B. Mandel" <ka1xo@juno.com>
Date: Sun, 19 Jun 2005 09:27:51 -0400
In reading some of the recent posts about new shipping woes, some of the new developments in equipment-shlepping bear discussion: Many of you remember how both FedEx Express and UPS separately destro
/archives//html/Amps/2005-06/msg00144.html (8,712 bytes)

230. Re: [Amps] Magnetic shielding (score: 1)
Author: "Harold B. Mandel" <ka1xo@juno.com>
Date: Sun, 19 Jun 2005 09:36:13 -0400
Dear Boris, This may not be entirely scientific, but I had a similar problem using old television receiver transformers that made noise. What I did was to put a 1/8" sheet of aluminum (or copper if I
/archives//html/Amps/2005-06/msg00145.html (8,823 bytes)

231. Re: [Amps] 220 amp power supply plugs (score: 1)
Author: "Harold B. Mandel" <ka1xo@juno.com>
Date: Thu, 23 Jun 2005 18:31:21 -0400
Dear Tom, The safest method is to use a.c. connections that cannot be mistaken for anything but higher voltage application. Additionally, using such connections in their higher amperage models afford
/archives//html/Amps/2005-06/msg00211.html (8,317 bytes)

232. Re: [Amps] Plate Cap Capacitors (score: 1)
Author: "Harold B. Mandel" <ka1xo@juno.com>
Date: Thu, 23 Jun 2005 18:40:23 -0400
Dear Mike, The request you sent regarding "Plate" capacitors hopefully is talking about the Plate D.C. blocking capacitor. A famous Italian ham has a web-based instruction on R.F. capacitors, please
/archives//html/Amps/2005-06/msg00212.html (7,114 bytes)

233. Re: [Amps] Door-knob capacitors (score: 1)
Author: "Harold B. Mandel" <ka1xo@juno.com>
Date: Sat, 25 Jun 2005 07:58:09 -0400
Dear Osten, "Doorknob" capacitors are manufactured in various "flavors" and have various applications both in HV-DC and in RF service. The numbers HT-50, HT-58, HT-57, HT-59 are all common to RF serv
/archives//html/Amps/2005-06/msg00228.html (7,612 bytes)

234. [Amps] Recommendation (score: 1)
Author: "Harold B. Mandel" <ka1xo@juno.com>
Date: Mon, 4 Jul 2005 10:27:20 -0400
Gentlemen, (and Ladies, of course), The firm, (and gentleman in charge of...) the below link is highly recommended to you for assistance with RF projects, especially high power amplifiers: Mr. Dave W
/archives//html/Amps/2005-07/msg00020.html (6,851 bytes)

235. Re: [Amps] Filter Cap for Alpha PA-77?? (score: 1)
Author: "Harold B. Mandel" <ka1xo@juno.com>
Date: Tue, 12 Jul 2005 06:46:36 -0400
Hi, Rich. Peter W. Dahl sells the exact capacitor needed. http://www.pwdahl.com pwdco@pwdahl.com Hal Mandel W4HBM On Mon, 11 Jul 2005 20:25:06 -0700 "Rich Hallman - N7TR" <rich@n7tr.com> writes: ____
/archives//html/Amps/2005-07/msg00109.html (6,877 bytes)

236. Re: [Amps] Alpha 78 rebuild, some questions. (score: 1)
Author: "Harold B. Mandel" <ka1xo@juno.com>
Date: Sat, 23 Jul 2005 11:12:37 -0400
Dear Martin, The bucking winding serves to increase the speed of the fan motor when the power transformer is under load. Alpha used a variable resistor to reduce the fan voltage as well in their '77
/archives//html/Amps/2005-07/msg00276.html (10,327 bytes)

237. [Amps] Protecting Blowers (score: 1)
Author: "Harold B. Mandel" <ka1xo@juno.com>
Date: Sat, 23 Jul 2005 11:05:15 -0400
Many of us use fans and blowers whose exhaust ports are open into the amplifier under-chassis plenum and even into the Anode compartment where their airflow cools the tank circuitry, and worry about
/archives//html/Amps/2005-07/msg00277.html (7,132 bytes)

238. Re: [Amps] NASA Workmanship Standards (score: 1)
Author: "Harold B. Mandel" <ka1xo@juno.com>
Date: Thu, 28 Jul 2005 18:34:44 -0400
Remember the Mars Observer spacecraft? $845,000,000.00 budget. The housekeeping CPU team opted for $1.29 a piece CMOS chips instead of the titanium-armored kind that was bid at $1.79 a piece. 1 stray
/archives//html/Amps/2005-07/msg00352.html (7,374 bytes)

239. Re: [Amps] 8877 Time Delay Query (score: 1)
Author: "Harold B. Mandel" <ka1xo@juno.com>
Date: Thu, 28 Jul 2005 18:44:34 -0400
Dear Ron, You will find a mix of opinions on this reflector regarding the application of Anode Voltage at turn-on. However, there is a general agreement that running just filament voltage for a while
/archives//html/Amps/2005-07/msg00353.html (10,429 bytes)

240. [Amps] Nuclear Magnetic Pulses (score: 1)
Author: "Harold B. Mandel" <ka1xo@juno.com>
Date: Mon, 1 Aug 2005 19:07:36 -0400
Sirs (and Ladies, of course), Mention was made in recent posts about EMP. Other than lightning damage, which can be relatively protected against by disconnection of antennae, telephone lines, a.c. po
/archives//html/Amps/2005-08/msg00017.html (6,833 bytes)

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