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121. [AMPS] Input matching experiment (score: 1): Author: Peter.Chadwick@zarlink.com (Peter Chadwick); Date: Mon, 21 Jan 2002 10:54:44 -0000; As we all know, the fact something has been published doesn't necessarily mean that it is correct. Look at Rich's favourite (!!!) amplifier circuit - the G2DAF. Although whether that gets its reputat; /archives//html/Amps/2002-01/msg00153.html (8,341 bytes)
122. [AMPS] Input matching experiment (score: 1): Author: Peter.Chadwick@zarlink.com (Peter Chadwick); Date: Mon, 21 Jan 2002 12:05:39 -0000; This is very true. Another important point is repeatability of the test results between various people, which is to my mind, a very good reason for repeating experiments. There's also another aspect.; /archives//html/Amps/2002-01/msg00155.html (8,318 bytes)
123. [AMPS] test - pls ignore (score: 1): Author: Peter.Chadwick@zarlink.com (Peter Chadwick); Date: Mon, 28 Jan 2002 11:14:06 -0000; -- FAQ on WWW: http://www.contesting.com/FAQ/amps Submissions: amps@contesting.com Administrative requests: amps-REQUEST@contesting.com Problems: owner-amps@contesting.com; /archives//html/Amps/2002-01/msg00217.html (6,509 bytes)
124. FW: [AMPS] Shunt regulated high voltage psu (score: 1): Author: Peter.Chadwick@zarlink.com (Peter Chadwick); Date: Mon, 28 Jan 2002 13:11:26 -0000; -- FAQ on WWW: http://www.contesting.com/FAQ/amps Submissions: amps@contesting.com Administrative requests: amps-REQUEST@contesting.com Problems: owner-amps@contesting.com; /archives//html/Amps/2002-01/msg00219.html (9,807 bytes)
125. [AMPS] found connectors but now : cable ? (score: 1): Author: Peter.Chadwick@zarlink.com (Peter Chadwick); Date: Mon, 28 Jan 2002 16:23:43 -0000; If the rabbit bites through the cable, there's a good chance you'll have partially cooked rabbit! 73 Peter G3RZP -- FAQ on WWW: http://www.contesting.com/FAQ/amps Submissions: amps@contesting.com Adm; /archives//html/Amps/2002-01/msg00225.html (8,734 bytes)
126. [AMPS] BWO Tube Helix Voltages... (score: 1): Author: Peter.Chadwick@zarlink.com (Peter Chadwick); Date: Tue, 29 Jan 2002 07:39:22 -0000; Jim asked: Dopn't know about BWOs, but the helix in a TWT does draw current. The last one I worked on was admittedly in the 1960's, but the helix on that drew 1.8Amps at 22kV. The collector ran depre; /archives//html/Amps/2002-01/msg00247.html (7,222 bytes)
127. [AMPS] Shunt regulated high voltage psu (score: 1): Author: Peter.Chadwick@zarlink.com (Peter Chadwick); Date: Tue, 29 Jan 2002 14:18:11 -0000; My understanding is that when you let grid and screen both float, you get better constancy of the zero signal current. That's as compared with letting one float and one be stabilised. I prefer the 's; /archives//html/Amps/2002-01/msg00264.html (9,686 bytes)
128. [AMPS] Shunt regulated high voltage psu (score: 1): Author: Peter.Chadwick@zarlink.com (Peter Chadwick); Date: Wed, 30 Jan 2002 07:36:56 -0000; If the tetrode has any Ra (plate resistance) at all, Ia is relatively insensitive to Va. It is sensitive to Vg2, and my original comment was that if Vg1 and Vg2 are unstabilised so that they both flo; /archives//html/Amps/2002-01/msg00299.html (10,104 bytes)
129. [AMPS] Shunt regulated high voltage psu (score: 1): Author: Peter.Chadwick@zarlink.com (Peter Chadwick); Date: Wed, 30 Jan 2002 10:25:08 -0000; Verty true - actually, anything with a suppressor grid. Which was why pentagrid convertors operated with the suppressor at ground gave less damping to the IF transformer in the plate. Showing age now; /archives//html/Amps/2002-01/msg00304.html (9,587 bytes)
130. [AMPS] bias regulator (score: 1): Author: Peter.Chadwick@zarlink.com (Peter Chadwick); Date: Wed, 30 Jan 2002 15:31:05 -0000; It's never easy to build anything into an IC! This is the voice of experience - I've been in the IC business for over 20 years. So I've learnt that IC designers all have strange weird minds. I know -; /archives//html/Amps/2002-01/msg00310.html (7,691 bytes)
131. [AMPS] Shunt regulated high voltage psu (score: 1): Author: Peter.Chadwick@zarlink.com (Peter Chadwick); Date: Thu, 31 Jan 2002 13:19:33 -0000; A lot depends on whether you go for a conventional transformer in which energy is transferred through the core, or a transmission line transformer where the core has a common mode suppression functio; /archives//html/Amps/2002-01/msg00367.html (9,364 bytes)
132. [AMPS] transmission line xfmers (score: 1): Author: Peter.Chadwick@zarlink.com (Peter Chadwick); Date: Thu, 31 Jan 2002 14:35:52 -0000; They can be made to work at high powers, but not necessarily the 'stock' design, as you say. Sevick is a good starting point for the theory. I think some his designs were tested at high power. I do h; /archives//html/Amps/2002-01/msg00371.html (7,582 bytes)
133. [AMPS] Another Stupid Question (score: 1): Author: Peter.Chadwick@zarlink.com (Peter Chadwick); Date: Mon, 3 Dec 2001 07:49:27 -0000; Following on from Tom's comment, just think how hot the bit of a 15 watt soldering iron gets...... 73 Peter G3RZP -- FAQ on WWW: http://www.contesting.com/FAQ/amps Submissions: amps@contesting.com Ad; /archives//html/Amps/2001-12/msg00012.html (8,899 bytes)
134. [AMPS] Low Pass Filters and Amplifiers (score: 1): Author: Peter.Chadwick@zarlink.com (Peter Chadwick); Date: Mon, 3 Dec 2001 07:58:59 -0000; Bob asked: capability the amplifier? All things being equal, the attenuations will add. The power handling requirement of the second filter will be less than the first by the insertion loss of the fi; /archives//html/Amps/2001-12/msg00013.html (8,083 bytes)
135. [AMPS] AL1500 (score: 1): Author: Peter.Chadwick@zarlink.com (Peter Chadwick); Date: Tue, 4 Dec 2001 15:54:07 -0000; According to info I received from W8JI, N1JV, N2JV and W0ID two years ago when I asked the same question, 8877s manufactured between late 1985 and 1989 are suspect. There was a design change in Augus; /archives//html/Amps/2001-12/msg00074.html (8,576 bytes)
136. [AMPS] AL1500 (score: 1): Author: Peter.Chadwick@zarlink.com (Peter Chadwick); Date: Tue, 4 Dec 2001 16:03:44 -0000; Sounds like the question could usefully be rephrased to ' Are there known 'good' production runs of 8877s?' 73 Peter G3RZP -- FAQ on WWW: http://www.contesting.com/FAQ/amps Submissions: amps@contesti; /archives//html/Amps/2001-12/msg00078.html (8,527 bytes)
137. [AMPS] Question : 4CX800 Amplifier 6-10-12-15-17-20 meters (score: 1): Author: Peter.Chadwick@zarlink.com (Peter Chadwick); Date: Tue, 4 Dec 2001 16:58:21 -0000; This rather depends on the input capacitance of the tube(s) and the value of grid swamping resistor used. With a highish value resistor (200 ohms) and a 20 or 30 pF of capcitance, the reactive input; /archives//html/Amps/2001-12/msg00080.html (7,425 bytes)
138. [AMPS] AL1500 (score: 1): Author: Peter.Chadwick@zarlink.com (Peter Chadwick); Date: Wed, 5 Dec 2001 07:21:25 -0000; 14-months. The copy I have of W0ID's email to N2JV suggests the fault appeared with the design changes of 8/86, and the second 'fix' saw initial deliveries in 8/88, while completion of field upgrade; /archives//html/Amps/2001-12/msg00089.html (9,374 bytes)
139. [AMPS] AL1500 (score: 1): Author: Peter.Chadwick@zarlink.com (Peter Chadwick); Date: Wed, 5 Dec 2001 12:45:26 -0000; Quite possibly. It's not an easy thing to trace, is it? The best bet is if you ship the amplifier, complete with tube, having done a 'burn in' run for say 100 hours. The cost of such a burn in (provi; /archives//html/Amps/2001-12/msg00098.html (9,056 bytes)
140. [AMPS] AL1500 (score: 1): Author: Peter.Chadwick@zarlink.com (Peter Chadwick); Date: Wed, 5 Dec 2001 12:55:31 -0000; Over and above semiconductors? Fine for many parts, but there's been plenty of semiconductor batches where poor manufacturing factors such as step coverage in metal and bad injection molding, poor de; /archives//html/Amps/2001-12/msg00099.html (9,160 bytes)

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