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141. [Amps] 3CX1000A7 and larger (score: 1): Author: "John Lyles" <jtml@losalamos.com>; Date: Tue, 16 Nov 2010 18:15:05 -0700; Do you mean no commercial amateur amplifiers? Today I tested my new tetrode amplifier to 735 kW peak with 1 mS long pulses, 60 per second. Average power was about 45 kW, at 198 MHz. That's VHF. Its o; /archives//html/Amps/2010-11/msg00281.html (7,947 bytes)
142. [Amps] brass or BNP hardware (score: 1): Author: "John Lyles" <jtml@losalamos.com>; Date: Fri, 19 Nov 2010 13:36:22 -0700; In RF power amplifiers, HF to VHF range, I have used brass or nonmagnetic stainless steel hardware for years, after having been "Burned" by steel screws - pun intended. Several times in my career I h; /archives//html/Amps/2010-11/msg00362.html (7,300 bytes)
143. [Amps] Silicon Carbide J-FET (score: 1): Author: John Lyles <jtml@losalamos.com>; Date: Thu, 25 Nov 2010 11:46:23 -0700; I don't know if its similar, but we have some special SiC SITs (static induction fets) from Microsemi that are capable of 1600 watts a piece (not push pull) with about 120 volts Vdd. This is, mind yo; /archives//html/Amps/2010-11/msg00443.html (7,814 bytes)
144. [Amps] wires through center of coax (score: 1): Author: John Lyles <jtml@losalamos.com>; Date: Mon, 20 Dec 2010 00:12:23 -0700; Bill - WA4LAV I hope that running wires through coax center conductor like this won't cause problems because I am doing it with the 9 3/16 inch diameter output feeder of a new amplifier I have been w; /archives//html/Amps/2010-12/msg00279.html (8,096 bytes)
145. [Amps] wires through center of coax (score: 1): Author: John Lyles <jtml@losalamos.com>; Date: Wed, 22 Dec 2010 01:17:37 -0700; Use of a quarter wave stub is common in fixed-frequency high power work to introduce mechanical linkages or electrical circuits that need to be inside the center conductor of a coaxial transmission l; /archives//html/Amps/2010-12/msg00305.html (10,684 bytes)
146. [Amps] 1 nF 3KV feedthrough (score: 1): Author: John Lyles <jtml@losalamos.com>; Date: Sat, 01 Jan 2011 13:25:46 -0700; If you're willing to pay the price, Draloric capacitors of Germany makes a suitable part for this. They are now owned by Vishay. Hi Energy makes similar parts in the USA. Over on your side of the pon; /archives//html/Amps/2011-01/msg00007.html (7,975 bytes)
147. [Amps] Restoring DX100 (score: 1): Author: John Lyles <jtml@losalamos.com>; Date: Sat, 15 Jan 2011 14:04:17 -0700; 900 volts on pair of 6146, 6146A, 6146B is exceeding max ratings for the tube. Not only is there overdissipation risk but also arc over. The socket for the rectifier tube will also be close to breaki; /archives//html/Amps/2011-01/msg00160.html (7,542 bytes)
148. [Amps] New solid state kid on the block (score: 1): Author: "John Lyles" <jtml@losalamos.com>; Date: Fri, 4 Feb 2011 13:37:21 -0700; ... While this is the normal practice with thermionic tubes, it is not a recommended practice with silicon. Bond wires in big devices are fatigued with pulsing high current. Thermal performance is n; /archives//html/Amps/2011-02/msg00018.html (10,136 bytes)
149. [Amps] What to buy? - ferrites and powdered iron (score: 1): Author: "John Lyles" <jtml@losalamos.com>; Date: Fri, 4 Feb 2011 13:50:54 -0700; The consensus read here says "no" to ferrite in high power RF amplification. But in proton synchrotron particle accelerators, ferrite is used nearly universally as part of the tuned circuit, in the r; /archives//html/Amps/2011-02/msg00021.html (9,874 bytes)
150. [Amps] source for finger stock (score: 1): Author: "John Lyles" <jtml@losalamos.com>; Date: Mon, 7 Feb 2011 13:24:41 -0700; Laird Technologies bought out Instrument Specialties finger stock line. They have minimum order quantities so you'd deal with a rep like Sager Electronics for stock. www.sager.com Both of these are c; /archives//html/Amps/2011-02/msg00045.html (7,130 bytes)
151. [Amps] door knob capacitors (score: 1): Author: John Lyles <jtml@losalamos.com>; Date: Sun, 06 Mar 2011 16:04:49 -0700; Carl Are you referring to Polyflon? They made a lot of metal-clad teflon and mylar film blocking capacitors and bypass capacitors used in RCA tube sockets. I have had good luck with High Energy Corp; /archives//html/Amps/2011-03/msg00058.html (9,134 bytes)
152. [Amps] doorknob cap suppliers ? (score: 1): Author: John Lyles <jtml@losalamos.com>; Date: Sat, 19 Mar 2011 13:26:36 -0600; I don't know if the ARRL or West Coast HB mention this, but when paralleling RF capacitors like this, try to layout so that they are physically in parallel, having the same length of strap to each. I; /archives//html/Amps/2011-03/msg00130.html (9,867 bytes)
153. [Amps] copper vs steel /SS /brass conductors in a HF tank circuit (score: 1): Author: "John Lyles" <jtml@losalamos.com>; Date: Tue, 22 Mar 2011 13:06:04 -0700; I'm pleased that Rob specified "in a HF tank circuit" for his comment "they are so nearly the same that copper strap is good enough; silver just looks pretty and impresses people." Silver does look p; /archives//html/Amps/2011-03/msg00171.html (9,169 bytes)
154. [Amps] Alpha vs. Henry (score: 1): Author: John Lyles <jtml@losalamos.com>; Date: Sun, 03 Apr 2011 20:10:19 -0600; The Broadcast Electronics FM transmitter power supplies for 1-3.5 kW tubes and single phase power used a polypropylene capacitor and a choke designed to be in parallel resonance at low current, to pr; /archives//html/Amps/2011-04/msg00058.html (10,314 bytes)
155. [Amps] Alpha vs. Henry (tuned choke PS filter) (score: 1): Author: "John Lyles" <jtml@losalamos.com>; Date: Mon, 4 Apr 2011 17:08:13 -0600; The title of this doesn't reflect what it has drifted to, but here is another nickel, comments on Jim's comments: If you don't design it properly, it will fail. The voltage across the resonator secti; /archives//html/Amps/2011-04/msg00148.html (11,386 bytes)
156. [Amps] Alpha vs Henry - tube temperature (score: 1): Author: John Lyles <jtml@losalamos.com>; Date: Sat, 09 Apr 2011 16:31:31 -0600; I use the old fashioned but accepted method to measure tube temperatures, a range of Tempilaq paint or Omega's labeled versions of the same, Omegalaq. It takes some practice to get a dot of paint wit; /archives//html/Amps/2011-04/msg00313.html (7,547 bytes)
157. [Amps] reports on large cavity amplifier design (score: 1): Author: John Lyles <jtml@losalamos.com>; Date: Tue, 12 Apr 2011 23:52:46 -0600; The design, construction and testing of a new power amplifier for 200 MHz (250 kW average power) is described in three papers going into the 2011 IEEE/Particle Accelerator Conference Proceedings. Her; /archives//html/Amps/2011-04/msg00358.html (7,173 bytes)
158. [Amps] testing a big amp (score: 1): Author: "John Lyles" <jtml@losalamos.com>; Date: Fri, 13 May 2011 18:06:24 -0600; A TH628 double-ended tetrode ("Diacrode") has been purring along all day heating a water load with 26 kV plate voltage, and 110 amps of plate current. At 200 MHz, it's been quite a leap, average powe; /archives//html/Amps/2011-05/msg00089.html (7,653 bytes)
159. Re: [Amps] Amps Digest, Vol 101, Issue 16 (score: 1): Author: John Lyles <jtml@losalamos.com>; Date: Mon, 16 May 2011 00:42:27 -0600; 2 MW out with 26 kV x 110 Amps (plus 60 kw of drive feedthru due to cathode driven) is quite good efficiency, 68%. 180 kW is the average (equivalent CW) power, as it is a pulsed amplifier. The peak p; /archives//html/Amps/2011-05/msg00121.html (7,666 bytes)
160. [Amps] testing a big amp (score: 1): Author: John Lyles <jtml@losalamos.com>; Date: Mon, 16 May 2011 00:43:52 -0600; 2 MW out with 26 kV x 110 Amps (plus 60 kw of drive feedthru due to cathode driven) is quite good efficiency, 68%. 180 kW is the average (equivalent CW) power, as it is a pulsed amplifier. The peak p; /archives//html/Amps/2011-05/msg00122.html (8,319 bytes)

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