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121. [Amps] TenTec+Nichrome (score: 127): Author: 2 at vc.net (2); Date: Thu Mar 27 15:07:53 2003; ** low vhf-Q suppressors are not impressive, except on an admittance/impedance analyzer - R. L. Measures, a.k.a. Rich..., 805.386.3734, AG6K, www.vcnet.com/measures. end; /archives//html/Amps/2003-03/msg00884.html (9,400 bytes)
122. [Amps] TenTec+Nichrome (score: 127): Author: 2 at vc.net (2); Date: Thu Mar 27 14:07:33 2003; ** correct ** I do not understand the question. Can you phrase it a bit more determinately? - R. L. Measures, a.k.a. Rich..., 805.386.3734, AG6K, www.vcnet.com/measures. end; /archives//html/Amps/2003-03/msg00882.html (9,698 bytes)
123. [Amps] Parasites (parasitics) (score: 127): Author: 2 at vc.net (2); Date: Thu Mar 27 14:07:14 2003; ** loading the parasitic after the fact is not possible. The trick is to reduce gain at the anode's specific damped-wave ringing frequency. ** A diagram, explanation, and circuit analysis are needed; /archives//html/Amps/2003-03/msg00881.html (10,541 bytes)
124. [Amps] TenTec+Nichrome (score: 127): Author: 2 at vc.net (2); Date: Thu Mar 27 14:06:48 2003; ** agreed, however, Ten-Tec initially did not figure that out. - R. L. Measures, a.k.a. Rich..., 805.386.3734, AG6K, www.vcnet.com/measures. end; /archives//html/Amps/2003-03/msg00880.html (8,439 bytes)
125. [Amps] TenTec+Nichrome (score: 127): Author: 2 at vc.net (2); Date: Thu Mar 27 11:51:54 2003; ** After the October 1988 article on improved parasitic-suppression appeared in *QST*, Ten-Tec tried low VHF-Q suppressors but they abandoned the idea after they found such suppressors get quite hot; /archives//html/Amps/2003-03/msg00875.html (8,083 bytes)
126. [Amps] Parasites (parasitics) (score: 127): Author: 2 at vc.net (2); Date: Thu Mar 27 11:51:36 2003; ** have you tried filtering the dreaded word? ? - R. L. Measures, a.k.a. Rich..., 805.386.3734, AG6K, www.vcnet.com/measures. end; /archives//html/Amps/2003-03/msg00874.html (8,548 bytes)
127. [Amps] Parasites (parasitics) (score: 127): Author: 2 at vc.net (2); Date: Thu Mar 27 10:13:26 2003; Note -- attribution marks added by yours truly. ** Is it possible to design a VHF suppressor that suppresses 100MHz, but does not suppress 30MHz ? -- The lowest parasite I know of was at 43MHz. The P; /archives//html/Amps/2003-03/msg00867.html (10,338 bytes)
128. [Amps] Parasites (parasitics) (score: 127): Author: 2 at vc.net (2); Date: Thu Mar 27 10:13:06 2003; ** this does not sound like a parasitic. ** I would: 1. measure the f.s. accuracy of the grid-current meter. 2. upgrade the 160m Tank-C padders to capacitors that are rated for tuned-circuit use. 3.; /archives//html/Amps/2003-03/msg00866.html (13,600 bytes)
129. [Amps] Parasites (parasitics) (score: 127): Author: 2 at vc.net (2); Date: Thu Mar 27 08:35:21 2003; However, the tradeoff with ceramic tubes is that they are rated for "Amplifier and Oscillator Service" to higher frequencies, so there could still be surprises lurking about,. For example, the 3-500; /archives//html/Amps/2003-03/msg00863.html (10,586 bytes)
130. [Amps] Parasites (parasitics) (score: 127): Author: 2 at vc.net (2); Date: Wed Mar 26 22:49:52 2003; The subject of parasites was discussed by F. E. Handy on p.72 of the 1926 Amateur Radio Operator's Handbook. My guess is that this was Not the earliest mention of the phenomenon. - R. L. Measures, a; /archives//html/Amps/2003-03/msg00860.html (8,213 bytes)
131. [Amps] Filament Inrush Control (score: 127): Author: 2 at vc.net (2); Date: Wed Mar 26 22:24:16 2003; AC relays buzz + arc their contacts in step-start service. However when operated on DC of a lower potential, they work fine. Typical DC potential pull-in is 20 - 30 v for a 115vac relay coil. - R. L.; /archives//html/Amps/2003-03/msg00859.html (8,307 bytes)
132. [Amps] High Input Swr SB-220 (score: 127): Author: 2 at vc.net (2); Date: Wed Mar 26 14:52:49 2003; ** with a tuner to correct the problem of not enough Q in the tuned inputs, a Q of 2 - 3 is not needed. - R. L. Measures, a.k.a. Rich..., 805.386.3734, AG6K, www.vcnet.com/measures. end; /archives//html/Amps/2003-03/msg00851.html (7,521 bytes)
133. [Amps] Filament Inrush Control (score: 127): Author: 2 at vc.net (2); Date: Wed Mar 26 08:04:51 2003; ** Correct. Some filament-type tubes have an inrush current-limit spec., but heater- type tubes apparently don't. The reason is probably because filament-type tubes have a high cold-R/hot-R ratio, t; /archives//html/Amps/2003-03/msg00841.html (8,525 bytes)
134. [Amps] High Input Swr SB-220 (score: 127): Author: 2 at vc.net (2); Date: Wed Mar 26 07:50:24 2003; The fix is to up the design Q of the Pi tuned input to something that solid-state radios will take. This is covered in the Nov./Dec., 1990 QST article. [orig manuscript on my Web site] cheers, Marty; /archives//html/Amps/2003-03/msg00840.html (7,340 bytes)
135. [Amps] Filament Inrush Control (score: 127): Author: 2 at vc.net (2); Date: Tue Mar 25 21:23:53 2003; Tnx, Phil. F. E. Handy, P.72 in the 1926 Handbook: "The combination of both resistance and inductance is very effective in limiting parasitic oscillations to a negligible value of current." - R. L.; /archives//html/Amps/2003-03/msg00830.html (8,689 bytes)
136. [Amps] Hard-drive Dive (score: 127): Author: 2 at vc.net (2); Date: Tue Mar 25 21:18:44 2003; Thanks. My experiences are with single-layer solenoid wound chokes. The pi-wound chokes I have dipped were a Pandorra's box. The bandswitch should DC hi-pot at 75% more than the anode PS. tnx, Gary; /archives//html/Amps/2003-03/msg00829.html (8,674 bytes)
137. [Amps] Filament Inrush Control (score: 127): Author: 2 at vc.net (2); Date: Tue Mar 25 20:14:01 2003; ** One DC relay plus one or two resistors makes a step-srart that's fail-safe, and it happily step-starts every transformer in the amplifier. [Figure 1 on my Web site] ** Super wound/current-limitin; /archives//html/Amps/2003-03/msg00826.html (10,529 bytes)
138. [Amps] Hard-drive Dive (score: 127): Author: 2 at vc.net (2); Date: Tue Mar 25 05:19:40 2003; ** Interesting. How many uH ? What are the lowest/first four choke resonances? tnx, Gary - R. L. Measures, a.k.a. Rich..., 805.386.3734, AG6K, www.vcnet.com/measures. end; /archives//html/Amps/2003-03/msg00820.html (7,680 bytes)
139. [Amps] 833A in linear for SSB (score: 127): Author: 2 at vc.net (2); Date: Mon Mar 24 21:06:12 2003; ** No ** depends on the tube. ** what is a common-grid tetrode ? ** g-g is normally AB2. . - R. L. Measures, a.k.a. Rich..., 805.386.3734, AG6K, www.vcnet.com/measures. end; /archives//html/Amps/2003-03/msg00818.html (7,360 bytes)
140. [Amps] 833A in linear for SSB (score: 127): Author: 2 at vc.net (2); Date: Mon Mar 24 20:41:41 2003; ** In order for a triode to be linear in grid-driven configuration, grid-cuurent can not be allowed to flow. In other words, the grid can not be driven positive. Maximal cathode current flows at 0 g; /archives//html/Amps/2003-03/msg00817.html (7,602 bytes)

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