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21. [Amps] Fw: Tank tweaking (score: 1): Author: garyschafer@attbi.com (Gary Schafer); Date: Sun, 22 Sep 2002 22:00:41 -0400; Hi Bill, Are you sure that your watt meter reads ok on 160 compared to the higher bands? The other possibility is that the coil stock for the 160 coil has too small wire. The lack of skin effect gets; /archives//html/Amps/2002-09/msg00190.html (10,715 bytes)
22. [Amps] meter internal R value, quick and easy. (score: 1): Author: garyschafer@attbi.com (Gary Schafer); Date: Thu, 01 Aug 2002 10:48:20 -0400; That won't work exactly right. If the pot in parallel with the meter matches the meter resistance then the sum of the meter and parallel resistor is 1/2 of what the meter was alone. That will increas; /archives//html/Amps/2002-08/msg00007.html (11,171 bytes)
23. [Amps] Yaesu FL2100B to 6 Meters? (score: 1): Author: garyschafer@attbi.com (Gary Schafer); Date: Tue, 27 Aug 2002 20:23:44 -0400; There were a few articles in QST on adding 6 meters to and converting to just 6 on the SB200. Some years back. I think in the 80's? I have also seen conversions done on the FL2100B where the original; /archives//html/Amps/2002-08/msg00292.html (9,308 bytes)
24. [Amps] ETO Model 70 Amplifier (score: 1): Author: garyschafer@attbi.com (Gary Schafer); Date: Mon, 01 Jul 2002 15:49:25 -0400; I think I have a radiator for one of those somewhere around here. 73 Gary K4FMX; /archives//html/Amps/2002-07/msg00013.html (9,054 bytes)
25. [Amps] Induction Motors was: Muffin Fans and hot exhaust (score: 1): Author: garyschafer@attbi.com (Gary Schafer); Date: Tue, 23 Jul 2002 22:13:14 -0400; I have used series capacitors for speed control of blowers with good success. A capacitor is much less critical than a resistor. It seems to provide a more stable speed too. On the subject of fans pu; /archives//html/Amps/2002-07/msg00452.html (8,962 bytes)
26. [Amps] WANTED: 115VAC time delay relay ON START (score: 1): Author: garyschafer@attbi.com (Gary Schafer); Date: Mon, 29 Jul 2002 21:58:58 -0400; Why not just put the coil of a relay in parallel with the transformer primary. When the filter capacitor charges up enough it will let the primary voltage come up enough to pull the relay in. If you; /archives//html/Amps/2002-07/msg00538.html (7,274 bytes)
27. [Amps] Strange Problerm (score: 1): Author: garyschafer@attbi.com (Gary Schafer); Date: Wed, 05 Jun 2002 22:29:04 -0400; When an amp is run on 240 volts there are not "2 legs" involved. The neutral is not used in the HV circuit. The transformer is connected only to the two hot lines so if one leg of the 240 was unbalan; /archives//html/Amps/2002-06/msg00033.html (9,055 bytes)
28. [Amps] Re: Big HV Transformer for Sale (score: 1): Author: garyschafer@attbi.com (Gary Schafer); Date: Thu, 20 Jun 2002 11:35:57 -0400; Combine two phase modulated signals and you have an AM signal. 73 Gary K4FMX; /archives//html/Amps/2002-06/msg00154.html (8,758 bytes)
29. [Amps] Re: Big HV Transformer for Sale (score: 1): Author: garyschafer@attbi.com (Gary Schafer); Date: Thu, 20 Jun 2002 20:36:14 -0400; Definitely not multi band or even multi frequency. Single frequency only. Advantage was high level modulation and class C efficiency without the usual big high level modulator. 73 Gary K4FMX; /archives//html/Amps/2002-06/msg00165.html (8,396 bytes)
30. [Amps] Re: Big HV Transformer for Sale (score: 1): Author: garyschafer@attbi.com (Gary Schafer); Date: Thu, 20 Jun 2002 21:47:20 -0400; With AM though the carrier efficiency is only about 30% with a linear amp. The amp needs to be tuned at and able to handle 4 times the carrier power to handle the audio peaks for 100% modulation. Mos; /archives//html/Amps/2002-06/msg00167.html (8,801 bytes)
31. [Amps] re: CTI screen regulator, tubes vs solid state (score: 1): Author: garyschafer@attbi.com (Gary Schafer); Date: Sun, 23 Jun 2002 21:55:46 -0400; Tom, I guess you haven't been keeping up. There has been a change in the laws of physics. A floating control grid will now automatically bias the tube back to a safe level with overdrive without crea; /archives//html/Amps/2002-06/msg00197.html (10,098 bytes)
32. [Amps] Defibrulator Caps as Filter Caps (score: 1): Author: garyschafer@attbi.com (Gary Schafer); Date: Sat, 29 Jun 2002 22:52:30 -0400; Hi David, does. I can't remember by how much they should be de rated but I think it is in the order of 40% ?? You might check on of the capacitor manufacturers web sites. They may tell you there. 73; /archives//html/Amps/2002-06/msg00279.html (9,041 bytes)
33. [Amps] Bird PEP circuit (score: 1): Author: garyschafer@attbi.com (Gary Schafer); Date: Fri, 03 May 2002 10:24:12 -0400; Hi Roger, When you say "the second stage is identical to the first" do you mean that the second amp has the same value resistors as the first amp (in the bird) or that the bird second stage is the sa; /archives//html/Amps/2002-05/msg00019.html (7,568 bytes)
34. [Amps] Bandswitch wanted (score: 1): Author: garyschafer@attbi.com (Gary Schafer); Date: Fri, 03 May 2002 21:34:55 -0400; Looking for a band switch wafer, the progressive shorting type. I have an old 813 amplifier that I built 30 some years and every once in awhile I work on it. It is time for a decent switch now. A sec; /archives//html/Amps/2002-05/msg00025.html (6,247 bytes)
35. [Amps] Rectifier diode strings (score: 1): Author: garyschafer@attbi.com (Gary Schafer); Date: Sun, 05 May 2002 17:08:28 -0400; Don't forget that the transformer core will also saturate with high voltage spikes and will not get through to the secondary. Depends on the transformer. Some will saturate with voltage not to far ov; /archives//html/Amps/2002-05/msg00038.html (11,803 bytes)
36. [Amps] Rectifier diode strings (score: 1): Author: garyschafer@attbi.com (Gary Schafer); Date: Mon, 06 May 2002 10:38:09 -0400; A transformer core saturates with voltage not current. It will saturate with no load at all. It is easy to see. Take a transformer with no secondary connection and put an ac ammeter in series with th; /archives//html/Amps/2002-05/msg00050.html (11,244 bytes)
37. [Amps] Band switch types (score: 1): Author: garyschafer@attbi.com (Gary Schafer); Date: Wed, 08 May 2002 17:52:49 -0400; What is the difference if the band switch is a progressive shorting type or just tap's the tank coil? Is there any difference in coil Q or losses? I know that the voltage can be quite high on say the; /archives//html/Amps/2002-05/msg00098.html (6,402 bytes)
38. [Amps] Silver plating (score: 1): Author: garyschafer@attbi.com (Gary Schafer); Date: Sat, 11 May 2002 16:03:32 -0400; I bought a little electroplating kit a year or so ago (never tried it yet) from a QST add. I think it was Texas platers. They have silver, nickel gold and a little brush that you hook to a battery. K; /archives//html/Amps/2002-05/msg00130.html (9,212 bytes)
39. [Amps] al-1500 parasitic?? or some other problem? (score: 1): Author: garyschafer@attbi.com (Gary Schafer); Date: Tue, 14 May 2002 17:46:09 -0400; -- Dave, What are you listening to the spur on? Could it be generated in the receiver? When you listen to it is it a clean carrier or is there any other modulation on it? Try turning off the computer; /archives//html/Amps/2002-05/msg00212.html (11,433 bytes)
40. [Amps] Door knob Capacitors (score: 1): Author: garyschafer@attbi.com (Gary Schafer); Date: Thu, 23 May 2002 15:55:29 -0400; Does anyone know about the old TV door knob caps. Typically 500 pf at 20 kv. Are they mica or ceramic and are they capable of handling any sizable current? Thanks Gary K4FMX; /archives//html/Amps/2002-05/msg00399.html (6,382 bytes)

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