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141. Re: [Amps] Shock hazard? (score: 1)
Author: "Harold B. Mandel" <ka1xo@juno.com>
Date: Fri, 12 Nov 2004 23:24:33 -0500
There's a composition resistor between the line cord and chassis ground. This is a common configuration of several years ago, especially found in 5-tube radios. ______________________________________
/archives//html/Amps/2004-11/msg00195.html (8,614 bytes)

142. [Amps] Zero Crossing Anomoly (score: 1)
Author: "Harold B. Mandel" <ka1xo@juno.com>
Date: Thu, 18 Nov 2004 19:03:59 -0500
Gents, My Commander 2500E never makes a "thump" when I turn on the a.c. mains. :) However, the 3,100 V.D.C. HV supply is instantly applied to the cold anodes of the three 3CPX800A7 triodes. :( In add
/archives//html/Amps/2004-11/msg00279.html (7,009 bytes)

143. [Amps] 73 (score: 1)
Author: "Harold B. Mandel" <ka1xo@juno.com>
Date: Fri, 19 Nov 2004 15:49:53 -0500
Gents, A weird posting just came across with mention of the shorthand "best regards" that we hear and see in shortwave. How many of us have sat and copied, "Dah dah dit dit dit Dit dit dit dah dah Da
/archives//html/Amps/2004-11/msg00300.html (7,177 bytes)

144. [Amps] Shaded Pole Blower Motor (score: 1)
Author: "Harold B. Mandel" <ka1xo@juno.com>
Date: Fri, 19 Nov 2004 21:40:06 -0500
Dear Will, The Dayton 4C761 blower in the Commander 2500E amp has a coil DC resistance of 14 ohms. My Fluke 36 clamp a.c. ammeter does not register even one ampere draw when the motor is turning. The
/archives//html/Amps/2004-11/msg00312.html (7,658 bytes)

145. [Amps] Shaded-pole Tube Blower (score: 1)
Author: "Harold B. Mandel" <ka1xo@juno.com>
Date: Sat, 20 Nov 2004 18:10:34 -0500
Pat Stein at Commander Amplifiers readily admitted that the Dayton 4C761 shaded pole turntable-type blower motors run very hot in the Commander amplifiers, like 180 to 200 degrees F. One of the fresh
/archives//html/Amps/2004-11/msg00342.html (7,359 bytes)

146. Re: [Amps] Shaded-pole Tube Blower (score: 1)
Author: "Harold B. Mandel" <ka1xo@juno.com>
Date: Tue, 23 Nov 2004 19:24:24 -0500
Dear Joe, I wholeheartedly agree! The blower, going through the 75 ohm resistor, is barely audible, especially when the station is running and the speaker overhead is churning out QRM/QRN. Another hu
/archives//html/Amps/2004-11/msg00403.html (11,293 bytes)

147. Re: [Amps] vacuum relay failure (score: 1)
Author: "Harold B. Mandel" <ka1xo@juno.com>
Date: Tue, 23 Nov 2004 19:54:39 -0500
(snip) Vacuum relays have ratings that are frequency sensitive. In my Alpha 77Sx clone, the input reed relay was unfortunately shattered by U.P.S. and so replacement time was at hand. Exploring othe
/archives//html/Amps/2004-11/msg00404.html (7,885 bytes)

148. Re: [Amps] Advice on instruments for ham use (score: 1)
Author: "Harold B. Mandel" <ka1xo@juno.com>
Date: Tue, 23 Nov 2004 20:12:00 -0500
Dear Pete, LASHEN ELECTRONICS in New Jersey has a good deal on a Protek P-2840 dual-channel 20MHz 'scope. They also have good prices on higher resolution scopes too. Hal Mandel W4HBM On Tue, 23 Nov 2
/archives//html/Amps/2004-11/msg00405.html (8,843 bytes)

149. Re: [Amps] My, my, what one can do with an 833A (score: 1)
Author: "Harold B. Mandel" <ka1xo@juno.com>
Date: Tue, 23 Nov 2004 20:05:47 -0500
Did you see the anniversary model at $150,000.00??? How about the $2,500 six-foot power cord? With all the junk around here I could be a zillionaire! Hal On Mon, 22 Nov 2004 16:25:11 -0800 "RICHARD G
/archives//html/Amps/2004-11/msg00406.html (9,567 bytes)

150. Re: [Amps] Need info on adding WARC bands to an old HB 4-1000A amp (score: 1)
Author: "Harold B. Mandel" <ka1xo@juno.com>
Date: Sat, 4 Dec 2004 01:08:52 -0500
Dear John, 1. If you have the room, wind a new choke with heavier wire and long enough to move the self-resonances to a benign spot. 2. Use the B&W, but add an additional choke that switches in on 24
/archives//html/Amps/2004-12/msg00061.html (8,099 bytes)

151. Re: [Amps] Current draw at 110 volts (score: 1)
Author: "Harold B. Mandel" <ka1xo@juno.com>
Date: Sat, 4 Dec 2004 01:01:42 -0500
Gents, If you do have a service drop bringing in three wires that measure 220/240 over a Neutral there is a solution without bashing the walls in. Since I couldn't remodel my home for 220 service in
/archives//html/Amps/2004-12/msg00062.html (8,188 bytes)

152. Re: [Amps] Unknown tube amp (score: 1)
Author: "Harold B. Mandel" <ka1xo@juno.com>
Date: Sun, 12 Dec 2004 15:02:56 -0500
Dear Chris, Please examine the tube sockets very carefully and record all numbers and letters you find on them, perhaps take a digital picture of the socket(s) and report back to the reflector on you
/archives//html/Amps/2004-12/msg00192.html (8,565 bytes)

153. [Amps] Unknown tube amp (score: 1)
Author: "Harold B. Mandel" <ka1xo@juno.com>
Date: Sun, 12 Dec 2004 15:33:18 -0500
Gents, My vote is also for a 250-TH. The collar pin recess says a lot. Question is, will the big bulb of the 250 fit in the tank area? Hal Mandel W4HBM _______________________________________________
/archives//html/Amps/2004-12/msg00193.html (7,559 bytes)

154. Re: [Amps] Tuning (score: 1)
Author: "Harold B. Mandel" <ka1xo@juno.com>
Date: Wed, 22 Dec 2004 13:24:49 -0500
Dear Daryl, The question of how far can you QSY without tuning is a mixed bag of information. Essentially, the point of resonance is at a particular frequency, and shifting that frequency throws the
/archives//html/Amps/2004-12/msg00268.html (8,377 bytes)

155. [Amps] antennas that are 1:1 vswr all over the band (score: 1)
Author: "Harold B. Mandel" <ka1xo@juno.com>
Date: Thu, 23 Dec 2004 13:13:46 -0500
1. There are antennas that are beverages and screwdrivers. 2. There are screwdrivers that are antennas and beverages. 3. There are beverages that are screwdrivers and antennas. And then there's Egg-N
/archives//html/Amps/2004-12/msg00291.html (8,483 bytes)

156. [Amps] sober virus (score: 1)
Author: "Harold B. Mandel" <ka1xo@juno.com>
Date: Fri, 24 Dec 2004 15:00:59 -0500
Dear Will, Visiting the SYMANTEC web site < http://securityresponse.symantec.com/avcenter/venc/data/w32.sober.removal .tool.html > will provide a means to all your correspondents who feel they might
/archives//html/Amps/2004-12/msg00307.html (7,048 bytes)

157. [Amps] 6 L 6 - GB/GT (score: 1)
Author: "Harold B. Mandel" <ka1xo@juno.com>
Date: Sat, 25 Dec 2004 12:52:48 -0500
The 6L6's used to run fine upside down in a 2 quart glass baking dish filled with transformer oil that the guys at the electric company Outside Plant Yard were all too happy to spare..... The slosh w
/archives//html/Amps/2004-12/msg00317.html (6,474 bytes)

158. Re: [Amps] Potter & Brumfield Relays (score: 1)
Author: "Harold B. Mandel" <ka1xo@juno.com>
Date: Sat, 25 Dec 2004 15:22:49 -0500
Dear Bob, You want to be very careful about relay-switching high voltage. Despite the open-frame design of the Magnacraft W158HVX-1, rated at 200mA @ 5.0KV, the possibility exists for an "anode event
/archives//html/Amps/2004-12/msg00318.html (9,242 bytes)

159. Re: [Amps] Back with another question - Ameritron 811H (score: 1)
Author: "Harold B. Mandel" <ka1xo@juno.com>
Date: Sun, 26 Dec 2004 14:14:07 -0500
Dear Sir, One phenomenon that may be occurring is the in-rush current to the amplifier is very heavy. This is exacerbated by low line voltage. Using a delay timer and DPDT relay with some resistance
/archives//html/Amps/2004-12/msg00342.html (7,628 bytes)

160. [Amps] INRUSH (score: 1)
Author: "Harold B. Mandel" <ka1xo@juno.com>
Date: Sun, 26 Dec 2004 16:02:19 -0500
Dear Dan, The Inrush Protector product you mention in your previous post is exactly the ticket. I just finished a commercial television transmitter repair job where the owners have replaced 300+ diod
/archives//html/Amps/2004-12/msg00345.html (7,077 bytes)

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