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61. [AMPS] Re: 3-500Z - ZG (score: 1): Author: w8jitom@worldnet.att.net (Tom Rauch (W8JI)); Date: Sat, 29 Mar 1997 08:53:47 -0500; Carl, does the Amprex 3-500Z require a reduction of bias when replacing a 3-500Z? When you plug in am Amprex tube does the gain increase? Neither of these things occur in any PA's I've seen. The spec; /archives//html/Amps/1997-03/msg00301.html (10,835 bytes)
62. [AMPS] Tuning the PA (score: 1): Author: w8jitom@worldnet.att.net (Tom Rauch (W8JI)); Date: Sat, 29 Mar 1997 09:19:34 -0500; Hi Bill, This is the REASON the SB-1000 manual tells people to load to tube at full drive, not to exceed 500mA (some later manuals 600 mA) of plate current. The manual then says to reduce drive to a; /archives//html/Amps/1997-03/msg00302.html (10,392 bytes)
63. [AMPS] Re: 3-500Z/ G (score: 1): Author: w8jitom@worldnet.att.net (Tom Rauch (W8JI)); Date: Sat, 29 Mar 1997 09:44:50 -0500; Tom asked: That's what I was afraid of. None of these things are traceable to oscillations. Look at this with what we all know about theory: 1.) The impedance of the tuning capacitor is very low (les; /archives//html/Amps/1997-03/msg00303.html (10,403 bytes)
64. [AMPS] Re: 3-500Z - ZG (score: 1): Author: w8jitom@worldnet.att.net (Tom Rauch (W8JI)); Date: Sat, 29 Mar 1997 21:35:08 -0500; Gettering takes place three ways, by absorbtion of gas during dispersal of the getter, by heating of a getter, and by the actions of an electrical discharge. The gettering agent in the 3-500Z is zirc; /archives//html/Amps/1997-03/msg00317.html (9,990 bytes)
65. [AMPS] al-1200 (score: 1): Author: w8jitom@worldnet.att.net (Tom Rauch (W8JI)); Date: Sat, 29 Mar 1997 21:49:13 -0500; The strap is for neutralizing. There is a 180 degree phase inverting transformer under the chassis, connected to the filament. The circuit samples RF near the anode by capcitive coupling, inverts the; /archives//html/Amps/1997-03/msg00318.html (7,418 bytes)
66. [AMPS] TL-922 at 4000 V (score: 1): Author: w8jitom@worldnet.att.net (Tom Rauch (W8JI)); Date: Sun, 30 Mar 1997 23:22:28 -0500; The TL-922 was designed under the old 1 kW dc input guidelines. It's pretty easy to get a 3-500Z amp to hold up and behave at voltages less than 3 kV. Raise the voltage much over 3500 volts, and you; /archives//html/Amps/1997-03/msg00348.html (7,540 bytes)
67. [AMPS] Re: 3-500Z/ G (score: 1): Author: w8jitom@worldnet.att.net (Tom Rauch (W8JI)); Date: Mon, 31 Mar 1997 00:28:49 -0500; Two sections are paralleled, and the contact arrangement is changed. It is not a standard JV series. Again the contact arrangement is changed. The ten meter tap is moved away from the grounded mounti; /archives//html/Amps/1997-03/msg00349.html (9,722 bytes)
68. [AMPS] HV Power Supply Capacitors (score: 1): Author: w8jitom@worldnet.att.net (Tom Rauch (W8JI)); Date: Mon, 31 Mar 1997 08:17:26 -0500; Common sense tells us the larger an object, the more heat it can dissipate. If you have two capacitors with equal ESR, and one has a much larger surface area, the larger one will be able to dissipate; /archives//html/Amps/1997-03/msg00355.html (7,857 bytes)
69. [AMPS] CLASSes of amps. (score: 1): Author: w8jitom@worldnet.att.net (Tom Rauch (W8JI)); Date: Mon, 31 Mar 1997 08:55:43 -0500; Looking at the classes commonly used in amateur service, they are divided by grid current and conduction angle. Conduction angle is the letter designations,and grid current is the number. Remember th; /archives//html/Amps/1997-03/msg00356.html (8,930 bytes)

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