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1. Re: [Amps] Henry 2003 Filter for 20002A Amp (score: 1): Author: STEVEN & NANCY FRAASCH <sjfraasch@embarqmail.com>; Date: Tue, 10 Jul 2007 12:20:31 -0400 (EDT); If you send the filter to me I can tune it. I'll do ya' better than a spectrum analyzer. I have two Agilent 2 port network analyzers here in my lab at work. You pay shipping both ways, and I'll take; /archives//html/Amps/2007-07/msg00156.html (10,494 bytes)
2. Re: [Amps] Clippertion L 572B tubes (score: 1): Author: STEVEN & NANCY FRAASCH <sjfraasch@embarqmail.com>; Date: Tue, 10 Jul 2007 13:37:42 -0400 (EDT); Don't go too crazy replacing tubes. More often that not, a tube is still quite good after years of use. Assuming that the filaments are wired in parallel, plug one tube into the amp at a time, key th; /archives//html/Amps/2007-07/msg00163.html (9,603 bytes)
3. Re: [Amps] 200w fast relay >> amp relays/ant switches (score: 1): Author: STEVEN & NANCY FRAASCH <sjfraasch@embarqmail.com>; Date: Tue, 10 Jul 2007 15:24:20 -0400 (EDT); John: Then Bonner-DD is your man because he has blown up everything under the sun. Me, I go with the big glass Kilovacs... 73, Steve, K0SF -- Original Message -- From: "W0UN -- John Brosnahan" <shr@s; /archives//html/Amps/2007-07/msg00170.html (8,401 bytes)
4. Re: [Amps] Clippertion L 572B tubes: Solder Water-Wash Flux (score: 1): Author: STEVEN & NANCY FRAASCH <sjfraasch@embarqmail.com>; Date: Wed, 11 Jul 2007 09:18:11 -0400 (EDT); I am referring to modern, water-wash flux like this from http://www.gluguru.com/electronics_materials.htm: ** Multicore Water Wash Fluxes-IPA Based Hydro-X/20 High Activity Flux A high activity water; /archives//html/Amps/2007-07/msg00188.html (12,421 bytes)
5. [Amps] Weighing In On Solder Water Wash Flux (score: 1): Author: STEVEN & NANCY FRAASCH <sjfraasch@embarqmail.com>; Date: Wed, 11 Jul 2007 09:53:07 -0400 (EDT); Perhaps I became too boisterous about water-wash flux, but let's face it, not too many of us are passionate about good soldering. I do a lot of it, and I have found the water-wash flux to give the be; /archives//html/Amps/2007-07/msg00191.html (7,766 bytes)
6. [Amps] Fwd: Weighing In On Solder Water Wash Flux (score: 1): Author: STEVEN & NANCY FRAASCH <sjfraasch@embarqmail.com>; Date: Wed, 11 Jul 2007 12:18:44 -0400 (EDT); Bill: You are using minute amounts of water-wash flux (it is quite benign). Rosin does not work nearly as well, and no assembler uses it. All industry has gone water-wash flush, whether the work is l; /archives//html/Amps/2007-07/msg00194.html (9,901 bytes)
7. [Amps] Fwd: suppressors (score: 1): Author: STEVEN & NANCY FRAASCH <sjfraasch@embarqmail.com>; Date: Fri, 13 Jul 2007 13:09:14 -0400 (EDT); Absolutely right Tom. If whomever is dealing with passband stability, the suppressor is almost out of the circuit. It is some small series jXl, where it will matter little with the high operating imp; /archives//html/Amps/2007-07/msg00212.html (11,463 bytes)
8. Re: [Amps] Amplifier power supply? (score: 1): Author: STEVEN & NANCY FRAASCH <sjfraasch@embarqmail.com>; Date: Sat, 14 Jul 2007 07:39:53 -0400 (EDT); No problemm; that is how it is done. The more core, more flux. Your essentially just making a bigger piece of permeable material. I'd individually wrap the cores in Teflon tape (what plumbers use for; /archives//html/Amps/2007-07/msg00223.html (9,613 bytes)
9. [Amps] Fwd: Question about 4-1000A operation (score: 1): Author: STEVEN & NANCY FRAASCH <sjfraasch@embarqmail.com>; Date: Sun, 15 Jul 2007 08:35:24 -0400 (EDT); Bob: I have SPICE models for various tube amps that I have created over the years. I have a 4-1000 model. You are welcome to it if you want it, but you'll need LT Spice from Linear Tech, which is fre; /archives//html/Amps/2007-07/msg00241.html (9,542 bytes)
10. Re: [Amps] Grid Dipping the Pi network in a new amp? (score: 1): Author: STEVEN & NANCY FRAASCH <sjfraasch@embarqmail.com>; Date: Sun, 15 Jul 2007 08:45:06 -0400 (EDT); Chuck: I don't know where you are coupling the grid dip to the network (I assume to the tank inductor), but you need terminations. Try adding a 50 ohm load at the output, and place a 1800 ohm resisto; /archives//html/Amps/2007-07/msg00242.html (10,160 bytes)
11. Re: [Amps] Grid Dipping the Pi network in a new amp? (score: 1): Author: STEVEN & NANCY FRAASCH <sjfraasch@embarqmail.com>; Date: Mon, 16 Jul 2007 08:05:30 -0400 (EDT); I'd dispense with the grid dip and get an antenna analyzer. Terminate as I suggest (leave the tube in socket so that the tube parasitics are in place) and look at the output port with the analyzer. D; /archives//html/Amps/2007-07/msg00258.html (10,439 bytes)
12. Re: [Amps] Grid Dipping the Pi network in a new amp? (score: 1): Author: STEVEN & NANCY FRAASCH <sjfraasch@embarqmail.com>; Date: Mon, 16 Jul 2007 08:38:58 -0400 (EDT); David: The resistor composition will not make as much difference as will the overall length of the resistor. Remember we're dealing with HF; therefore, I don't think a 1/8 watt resistor with short le; /archives//html/Amps/2007-07/msg00260.html (13,574 bytes)
13. Re: [Amps] Alpha 76 Plate Meter Calibration (score: 1): Author: STEVEN & NANCY FRAASCH <sjfraasch@embarqmail.com>; Date: Mon, 16 Jul 2007 12:51:29 -0400 (EDT); Bob: Yeah, leave the line cord unlugged. Measure the cathode resistor cold. It should be a few ohms. Plate current times that resistance is a voltage drop. Assuming it is 3 ohms, 500 ma of plate curr; /archives//html/Amps/2007-07/msg00269.html (7,763 bytes)
14. Re: [Amps] Grid Dipping the Pi network in a new amp? (score: 1): Author: STEVEN & NANCY FRAASCH <sjfraasch@embarqmail.com>; Date: Tue, 17 Jul 2007 08:22:33 -0400 (EDT); Chuck: I just think it is something easy. For example, is your bandswitch shorting the section of inductor that should be in play ? Is your plate choke much smaller than planned (that would have the; /archives//html/Amps/2007-07/msg00294.html (14,534 bytes)
15. Re: [Amps] Grid Dipping the Pi network in a new amp? (score: 1): Author: STEVEN & NANCY FRAASCH <sjfraasch@embarqmail.com>; Date: Tue, 17 Jul 2007 10:05:46 -0400 (EDT); Tom: I think we agree on not taking it apart and starting over and check what should be obvious. Without the benefit of looking at the amp, I can only throw out suggestions. Obvious things whether th; /archives//html/Amps/2007-07/msg00299.html (12,989 bytes)
16. Re: [Amps] Grid Dipping the Pi network in a new amp? (score: 1): Author: STEVEN & NANCY FRAASCH <sjfraasch@embarqmail.com>; Date: Tue, 17 Jul 2007 16:03:08 -0400 (EDT); Bob: The antenna analyzer SHOULD have a source impedance of ~50 ohms. If it didn't it would cause a reflection (or possibly reduce or cancel a reflection) if it presents an odd conjugate condition ot; /archives//html/Amps/2007-07/msg00303.html (18,730 bytes)
17. Re: [Amps] SB-200 DATA (score: 1): Author: STEVEN & NANCY FRAASCH <sjfraasch@embarqmail.com>; Date: Tue, 17 Jul 2007 16:36:38 -0400 (EDT); Do you mean instability as in oscillation ? What is the frequency of the oscillation ? It shouldn't be that sensitive to a grid resistor value. If it is, you must have little phase margin, and I woul; /archives//html/Amps/2007-07/msg00305.html (9,573 bytes)
18. Re: [Amps] Grid Dipping the Pi network in a new amp? (score: 1): Author: STEVEN & NANCY FRAASCH <sjfraasch@embarqmail.com>; Date: Tue, 17 Jul 2007 23:50:05 -0400 (EDT); Yes, I am choking over Bob's comments. Metal work looks good. It looks like your green clip lead is the output, and the red lead is for the 1.8K termination. Getting this stuff in close and tight is; /archives//html/Amps/2007-07/msg00316.html (11,003 bytes)

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