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141. Re: [Amps] Clean -vs- Unclean (score: 1): Author: Gary Schafer <garyschafer@comcast.net>; Date: Mon, 09 Jan 2006 13:47:56 -0500; I was going to mention that a few weeks ago Tom! A dirty transmitter station receives much better than a clean one!! 73 Gary K4FMX _______________________________________________ Amps mailing list Am; /archives//html/Amps/2006-01/msg00292.html (9,612 bytes)
142. Re: [Amps] Effects of load Z mismatch? (score: 1): Author: Gary Schafer <garyschafer@comcast.net>; Date: Mon, 09 Jan 2006 14:05:20 -0500; Efficiency has nothing to do with amount of distortion. Distortion is mainly determined by where on the load line the tube is operated and how linear that load line is. Although poor efficiency may; /archives//html/Amps/2006-01/msg00296.html (8,063 bytes)
143. Re: [Amps] Capacitor wanted (score: 1): Author: "Gary Schafer" <garyschafer@comcast.net>; Date: Sun, 15 Jan 2006 13:09:22 -0500; How much power you planning on running? 500 volts should be enough for that. 73 Gary K4FMX Need a 1500 pF or more variable for load cap, 1500 watt amp. Can be air or vacuum, 1500 volt or more. What d; /archives//html/Amps/2006-01/msg00388.html (7,461 bytes)
144. Re: [Amps] Tuned Input (score: 1): Author: "Gary Schafer" <garyschafer@comcast.net>; Date: Sat, 21 Jan 2006 22:59:23 -0500; Could you elaborate a little more on this? Why is the efficiency less when a coil input is at the cathode? Also wouldn't "too much coax" provide extra capacitance to ground? I assume that the harmoni; /archives//html/Amps/2006-01/msg00500.html (15,366 bytes)
145. Re: [Amps] Building or Buying a Tuned Input Network (score: 1): Author: "Gary Schafer" <garyschafer@comcast.net>; Date: Mon, 23 Jan 2006 13:29:34 -0500; Having a fixed input cap and fixed inductance you can not vary the center frequency of the circuit. 73 Gary K4FMX _______________________________________________ Amps mailing list Amps@contesting.co; /archives//html/Amps/2006-01/msg00541.html (10,760 bytes)
146. Re: [Amps] Building or Buying a Tuned Input Network (score: 1): Author: "Gary Schafer" <garyschafer@comcast.net>; Date: Mon, 23 Jan 2006 14:38:09 -0500; The Sb200 has fixed caps on input and output and a slug tuned coil. Tuning the coil moves the center frequency while the swr remains relatively constant. 73 Gary K4FMX ______________________________; /archives//html/Amps/2006-01/msg00549.html (10,972 bytes)
147. Re: [Amps] Tuned Input (score: 1): Author: "Gary Schafer" <garyschafer@comcast.net>; Date: Mon, 23 Jan 2006 14:41:57 -0500; Can you explain why we care that harmonics are shown a low impedance in the cathode circuit? How does this effect efficiency? I read that Orr recommended around 13 pf capacitance per meter of frequen; /archives//html/Amps/2006-01/msg00550.html (21,152 bytes)
148. Re: [Amps] Tuned input (score: 1): Author: "Gary Schafer" <garyschafer@comcast.net>; Date: Tue, 24 Jan 2006 11:23:39 -0500; Thanks Karl-Arne, very informative! Someone mentioned putting a capacitor directly at the cathode as part of the tuned input network to alleviate the inductance problem on 10 meters. It seems that wo; /archives//html/Amps/2006-01/msg00578.html (10,711 bytes)
149. Re: [Amps] AC to DC (score: 1): Author: "Gary Schafer" <garyschafer@comcast.net>; Date: Sun, 29 Jan 2006 16:44:54 -0500; A DC relay is wound with enough resistance to withstand the applied voltage. An AC relay depends partly on the inductance presented by the coil for its impedance to AC. That same coil on DC may not; /archives//html/Amps/2006-01/msg00701.html (8,731 bytes)
150. Re: [Amps] AC to DC (score: 1): Author: "Gary Schafer" <garyschafer@comcast.net>; Date: Sun, 29 Jan 2006 17:11:47 -0500; Yes, but my point is that an AC relay operated on DC with the DC voltage the same as the AC voltage rating, the relay may overheat. 73 Gary K4FMX _______________________________________________ Amps; /archives//html/Amps/2006-01/msg00703.html (8,488 bytes)
151. Re: [Amps] What blower? (score: 1): Author: "Gary Schafer" <garyschafer@comcast.net>; Date: Sun, 29 Jan 2006 17:15:48 -0500; I wonder if those IR thermometers won't give a false reading of glass temperatures because of also picking up the direct radiated IR from the tubes plate as it is operating. 73 Gary K4FMX ___________; /archives//html/Amps/2006-01/msg00704.html (10,985 bytes)
152. Re: [Amps] What blower? (score: 1): Author: "Gary Schafer" <garyschafer@comcast.net>; Date: Sun, 29 Jan 2006 17:22:47 -0500; For a given amount of air flow and a given amount of back pressure, the smaller the blower wheel the greater speed it needs to run at. The larger the blower wheel the slower it can turn for the same; /archives//html/Amps/2006-01/msg00705.html (8,806 bytes)
153. Re: [Amps] cathode to ground in tetrode amp (score: 1): Author: "Gary Schafer" <garyschafer@comcast.net>; Date: Mon, 30 Jan 2006 12:44:15 -0500; Don't believe everything you see on the internet. 73 Gary K4FMX _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps; /archives//html/Amps/2006-01/msg00722.html (10,527 bytes)
154. Re: [Amps] cathode to ground in tetrode amp (score: 1): Author: "Gary Schafer" <garyschafer@comcast.net>; Date: Mon, 30 Jan 2006 12:49:31 -0500; ground is to prevent negative screen current from raising the screen voltage. The cathode resistor is obviously a mistake. 73 Gary K4FMX _______________________________________________ Amps mailing; /archives//html/Amps/2006-01/msg00723.html (11,846 bytes)
155. Re: [Amps] AC to DC (score: 1): Author: "Gary Schafer" <garyschafer@comcast.net>; Date: Mon, 30 Jan 2006 12:59:02 -0500; I wouldn't worry about any hum. The AC voltage will be fine to operate the relays. If you do want to run them on DC advice has been given to do that. 73 Gary K4FMX __________________________________; /archives//html/Amps/2006-01/msg00726.html (9,748 bytes)
156. Re: [Amps] cathode to ground in tetrode amp (score: 1): Author: "Gary Schafer" <garyschafer@comcast.net>; Date: Mon, 30 Jan 2006 14:28:50 -0500; This guy used a series screen regulator and a fuse also in series so the swamping resistor from screen to ground is a necessity. 73 Gary K4FMX _______________________________________________ Amps mai; /archives//html/Amps/2006-01/msg00731.html (14,886 bytes)
157. Re: [Amps] cathode to ground in tetrode amp (score: 1): Author: "Gary Schafer" <garyschafer@comcast.net>; Date: Mon, 30 Jan 2006 17:07:40 -0500; 30K of cathode resistance for negative feed back Seams a little high. :>) 73 Gary K4FMX _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.; /archives//html/Amps/2006-01/msg00733.html (10,311 bytes)
158. [Amps] T networks and harmonics (score: 1): Author: "Gary Schafer" <garyschafer@comcast.net>; Date: Sun, 5 Feb 2006 22:48:48 -0500; There was some discussion a few days ago about pi/L networks and harmonics. Someone suggested that a T network tuner would also help reduce harmonic energy out of an amp as "it did not only act as a; /archives//html/Amps/2006-02/msg00122.html (8,535 bytes)
159. Re: [Amps] T networks and harmonics (score: 1): Author: "Gary Schafer" <garyschafer@comcast.net>; Date: Mon, 6 Feb 2006 17:57:24 -0500; Hi Bill, I guess this was in response to your response to someone that said that "a T network tuner after the amp would not help reduce harmonics as it was basically a high pass filter". You said tha; /archives//html/Amps/2006-02/msg00141.html (13,137 bytes)
160. Re: [Amps] Glass envelope (score: 1): Author: "Gary Schafer" <garyschafer@comcast.net>; Date: Tue, 7 Feb 2006 22:33:08 -0500; It has more air. 73 Gary K4FMX _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps; /archives//html/Amps/2006-02/msg00176.html (7,756 bytes)

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