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Total 421 documents matching your query.

161. Re: [Amps] SB-220 (score: 1)
Author: "Harold B. Mandel" <ka1xo@juno.com>
Date: Mon, 27 Dec 2004 11:17:17 -0500
Dear Larry, Commercial broadcasters leave their transmitters on 24/7. The most intense time for your amplifier is when it's turned on from room temperature. By the time it has warmed up a couple of h
/archives//html/Amps/2004-12/msg00360.html (8,118 bytes)

162. Re: [Amps] KW Rated Low Pass Filter Caps? (score: 1)
Author: "Harold B. Mandel" <ka1xo@juno.com>
Date: Fri, 31 Dec 2004 12:03:30 -0500
Dear Doc, You need to be careful about mica caps. They are used widely in BC applications in AM service because they are effective below 1.0MHz. Above 1 MHz., they tend to heat up too fast and drift
/archives//html/Amps/2004-12/msg00409.html (8,728 bytes)

163. Re: [Amps] Y-180 (score: 1)
Author: "Harold B. Mandel" <ka1xo@juno.com>
Date: Sat, 1 Jan 2005 16:33:29 -0500
Dear David, The Y-180 tube, especially in Push-Pull, makes a DYNAMITE stereo amplifier! A year or two ago, before I got into this amplifier building thing I was going to build a Y-180 AF amplifier, r
/archives//html/Amps/2005-01/msg00005.html (7,093 bytes)

164. [Amps] Parasites (score: 1)
Author: "Harold B. Mandel" <ka1xo@juno.com>
Date: Sun, 2 Jan 2005 14:38:14 -0500
Gentlemen, gentlemen, The effect of Microbe wire can be easily nullified with the correct positioning of the Wouff Hong. Now if you think I'm wrong you go ask every OT op out there..... Happy New Yea
/archives//html/Amps/2005-01/msg00024.html (6,329 bytes)

165. Re: [Amps] 1/2" bore Control Knob (score: 1)
Author: "Harold B. Mandel" <ka1xo@juno.com>
Date: Tue, 11 Jan 2005 17:34:41 -0500
Dear Chris, Do you have access to a metalworking lathe and a drill press? Use a two-inch diameter piece of Lucite rod, drill a 1/2" hole about halfway through on one end. Drill a #36 hole on one edge
/archives//html/Amps/2005-01/msg00219.html (7,388 bytes)

166. [Amps] Filament Voltage Adjustment (score: 1)
Author: "Harold B. Mandel" <ka1xo@juno.com>
Date: Mon, 17 Jan 2005 09:18:04 -0500
Sirs, After finding my new filament transformer, (PWD!) rated at 5.0vac, 25 amperes, CCS, was only showing 4.291 volts at the tube socket it required a new transformer (this time supplied by another
/archives//html/Amps/2005-01/msg00318.html (8,004 bytes)

167. [Amps] Correct Filament Voltage (score: 1)
Author: "Harold B. Mandel" <ka1xo@juno.com>
Date: Mon, 17 Jan 2005 15:08:01 -0500
Gents, Thanks for all the good information in your replies concerning the correct filament voltage for the 77Sx clone. As told to me, the 3CPX1500A7 triode is a 3CX1500A7 that's been to the gymnasium
/archives//html/Amps/2005-01/msg00324.html (6,983 bytes)

168. Re: [Amps] DC heater supply or AC heater supply (score: 1)
Author: "Harold B. Mandel" <ka1xo@juno.com>
Date: Tue, 18 Jan 2005 13:42:28 -0500
Dear Geert, The HF amplifier just finishing up here uses two 3CPX1500A7 triodes that consume 22 amperes at 5.00 volts on the paralleled filaments. As the filament design uses a fully floating supply
/archives//html/Amps/2005-01/msg00354.html (9,236 bytes)

169. Re: [Amps] Grid driven Multi-band amp using 4-1000 (score: 1)
Author: "Harold B. Mandel" <ka1xo@juno.com>
Date: Wed, 19 Jan 2005 11:07:04 -0500
Dear Steve, Neutralization of tetrodes provides a better match between the driver and Power Amplifier, and also serves to protect the PA from deleterious oscillations. With the cost of a replacement
/archives//html/Amps/2005-01/msg00368.html (7,953 bytes)

170. [Amps] What is it called? (score: 1)
Author: "Harold B. Mandel" <ka1xo@juno.com>
Date: Sat, 22 Jan 2005 11:32:52 -0500
Sirs, There is a material that is supplied in sheets of varying thicknesses, colored red, that makes excellent insulating boards. Does anyone know its trade name or who sells it? Thanks, Hal Mandel W
/archives//html/Amps/2005-01/msg00451.html (6,782 bytes)

171. [Amps] Red Insulation board (score: 1)
Author: "Harold B. Mandel" <ka1xo@juno.com>
Date: Sat, 22 Jan 2005 14:43:01 -0500
Dear Will and the Group, Thank you for all the replies. In fact, GLASTIC is the stuff. I found out about its superior qualities while doing power plant work for Ma Bell, and even the "apple" insulato
/archives//html/Amps/2005-01/msg00462.html (7,147 bytes)

172. Re: [Amps] doorknob cap (score: 1)
Author: "Harold B. Mandel" <ka1xo@juno.com>
Date: Tue, 25 Jan 2005 11:44:10 -0500
Dear Dom, I'm looking at a unit in my hand and I'll type the label: " CRL 858 " " 1000PF +/-20% 8803 " " 5KVDC X5V " The cap was used in the ALPHA 77 series but experience proved it to not have the K
/archives//html/Amps/2005-01/msg00522.html (7,085 bytes)

173. [Amps] Looking for tubes & sockets (score: 1)
Author: "Harold B. Mandel" <ka1xo@juno.com>
Date: Tue, 25 Jan 2005 19:51:42 -0500
Gents, I am looking for the following items and will remit promptly: 4CX1,000K - need 2, NIB only. PLATE XFMR, 240vac pri., 3,000 - 3,200v @ 2 A CCS., C-T not nec. Thank you for looking through the p
/archives//html/Amps/2005-01/msg00525.html (6,306 bytes)

174. [Amps] PWD (score: 1)
Author: "Harold B. Mandel" <ka1xo@juno.com>
Date: Sat, 29 Jan 2005 21:09:21 -0500
Sirs, The ALPHA clone has passed the "EHT" test as described so well by our Brit cousins. No arcs, no sparks, no flames, no explosions and no funny smells. However, I thought that the HV meter on the
/archives//html/Amps/2005-01/msg00596.html (7,374 bytes)

175. Re: [Amps] Viewstar PT-2500A on/off switch needed (score: 1)
Author: "Harold B. Mandel" <ka1xo@juno.com>
Date: Sat, 29 Jan 2005 20:51:40 -0500
Dear Gary, It would help to know the exact manufacturer and type of switch on your dad's amp. Hal W4HBM On Sat, 29 Jan 2005 14:46:53 -0600 "Gary Smith" <Gary@doctorgary.net> writes: _________________
/archives//html/Amps/2005-01/msg00597.html (7,755 bytes)

176. [Amps] Filter Capacitors (score: 1)
Author: "Harold B. Mandel" <ka1xo@juno.com>
Date: Sat, 29 Jan 2005 21:00:56 -0500
Dear Folks, If you were to physically examine an oil-filled capacitor that is rated for filter service, with a description of "x" WVDC versus an energy discharge capacitor of the same capacitance and
/archives//html/Amps/2005-01/msg00598.html (7,189 bytes)

177. [Amps] 10dB and propagation (score: 1)
Author: "Harold B. Mandel" <ka1xo@juno.com>
Date: Mon, 7 Feb 2005 17:15:12 -0500
Sirs, Entropy might be a poor choice of words in this situation, but it is a collateral consideration alongside "Conservation of Energy." While one learned commenter says that the ionosphere is "cond
/archives//html/Amps/2005-02/msg00258.html (8,598 bytes)

178. Re: [Amps] Quick 220 outlet? (score: 1)
Author: "Harold B. Mandel" <ka1xo@juno.com>
Date: Mon, 7 Feb 2005 17:26:36 -0500
This all depends upon finding an outlet within reach of the two extension cords that is on an opposite hot leg of the a.c. supply. In my hotel-room Dxpedition last year my room had 3-wire service, bu
/archives//html/Amps/2005-02/msg00259.html (8,686 bytes)

179. Re: [Amps] Quick 220 outlet? (score: 1)
Author: "Harold B. Mandel" <ka1xo@juno.com>
Date: Mon, 7 Feb 2005 21:22:32 -0500
Dear Jim, I'm one of them kinda guys that turn off the breaker and use a meter to see if there's any juice. After being knocked on my ass a bunch of times in the last 43 years of working with broadca
/archives//html/Amps/2005-02/msg00280.html (8,865 bytes)

180. Re: [Amps] Quick 220 outlet? (score: 1)
Author: "Harold B. Mandel" <ka1xo@juno.com>
Date: Mon, 7 Feb 2005 21:31:30 -0500
I tried the hotel room a/c unit mains first choice before going in under the stove. The a/c unit used 2 wires. One was neutral and the other was 265 (!) vac. I put the cover back on the a/c unit then
/archives//html/Amps/2005-02/msg00281.html (8,082 bytes)

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