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141. [AMPS] Constant Voltage (Sola) Transformer wanted (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Tue, 13 Nov 2001 20:07:41 -0500; The Sola's I've seen function by saturating a magnetic core (making a somewhat flat top waveform), and then trying to "round" the waveform back by eliminating a few harmonics with a capacitor. They; /archives//html/Amps/2001-11/msg00236.html (8,776 bytes)
142. [AMPS] new FETs (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Tue, 27 Nov 2001 19:24:21 -0500; How is the IMD performance of the linear devices John? We have enough dirty tetrode amps on the bands, I wonder if the IMD of these devices is state-of-the-art in IMD? I know the class C designs wer; /archives//html/Amps/2001-11/msg00445.html (7,709 bytes)
143. [AMPS] Another Stupid Question (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Wed, 28 Nov 2001 20:29:37 -0500; Mostly it seems people just guess at what to use, and never think about why a certain value is required. Most of the sizes used are actually just plain silly..being far too big in capacitance..and t; /archives//html/Amps/2001-11/msg00470.html (8,826 bytes)
144. [AMPS] 4cx10000D needed (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Thu, 29 Nov 2001 08:06:45 -0500; I need a good full-emission 4CX10000D tube. Anyone have one laying around they want to sell? 73, Tom W8JI W8JI@contesting.com -- FAQ on WWW: http://www.contesting.com/FAQ/amps Submissions: amps@conte; /archives//html/Amps/2001-11/msg00477.html (8,407 bytes)
145. [AMPS] Another Stupid Question (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Thu, 29 Nov 2001 08:06:45 -0500; That's why I put current near the top of the list as something that should be looked at, instead of picking a ridiculously high value of capacitance. 73, Tom W8JI W8JI@contesting.com -- FAQ on WWW:; /archives//html/Amps/2001-11/msg00478.html (8,536 bytes)
146. [AMPS] Another Stupid Question (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Thu, 29 Nov 2001 19:12:35 -0500; Well let's see... If the anode operating impedance is 3000 ohms and we use the somewhat incorrect but common method of Rp/Xc = Q, then we would have 300 ohms Xc with a Q of ten. That means the block; /archives//html/Amps/2001-11/msg00490.html (8,382 bytes)
147. [AMPS] Another Stupid Question (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Thu, 29 Nov 2001 19:12:35 -0500; If you lost even 1% of the power output in the blocking cap, it would explode, melt, sag, or turn to smoke. One of the biggest myths around is that blocking caps noticeably affect efficiency. 73, To; /archives//html/Amps/2001-11/msg00491.html (8,762 bytes)
148. [AMPS] Special power-up on old unused AL-1200? (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Mon, 1 Oct 2001 20:26:48 -0400; Whatever you do, DON'T start it through a variac and wind it up slowly unless you defeat the step-start system!!!! While you can most likely just power it up (the capacitors have 550 volt foil and w; /archives//html/Amps/2001-10/msg00007.html (7,966 bytes)
149. [AMPS] YC-156 Input impedance (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Wed, 3 Oct 2001 07:47:00 -0400; Using Eimac's characteristic curves in a software generated Chafffe analysis all for class AB2: 6000v @ 14000w=30 ohms cathode impedance 6500v @ 12000w=23 ohms 5000v @ 10,000w=19 ohms Driving impeda; /archives//html/Amps/2001-10/msg00026.html (9,168 bytes)
150. [AMPS] Noises in electrolytic capacitors (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Wed, 3 Oct 2001 08:23:19 -0400; While I have no idea specifically about the resistor used in that case, when looking at the parts inherited from other "XXXXstar" bankruptcy purchases many were surplus. Amp supply had the same purc; /archives//html/Amps/2001-10/msg00027.html (9,674 bytes)
151. [AMPS] Noises in electrolytic capacitors (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Wed, 3 Oct 2001 08:23:19 -0400; In the case of equal value parallel resistors, the capacitors would have to be rated at twice the normal operating voltage. Otherwise you gain nothing. Using a high value and low value in parallel w; /archives//html/Amps/2001-10/msg00028.html (8,791 bytes)
152. [AMPS] YC-156 Input impedance (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Wed, 3 Oct 2001 16:03:55 -0400; 80 and 160 are the worse bands in terms of BW. Using a network Q of 5 and 18 ohms load R, 50 ohms source R... I get 5380 pF/1.84uH/ 8157 pF for 160-meters and an SWR of 1.5:1 at band edges. That's a; /archives//html/Amps/2001-10/msg00052.html (8,562 bytes)
153. [AMPS] YC-156 Input impedance (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Wed, 3 Oct 2001 16:03:55 -0400; yes. They certainly are. You have to start somewhere. Anyone who thinks he can do a paper design or look at a operating sheet and not tweak anything is living in dream-land. 73, Tom W8JI W8JI@contes; /archives//html/Amps/2001-10/msg00053.html (8,209 bytes)
154. [AMPS] SB-220 (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Wed, 3 Oct 2001 17:03:26 -0400; I have a few dozen original SB-220 parts boxes and tape, plus the shipping boxes that were sent to me when I was doing work for Heath. I'm actually using them for trash boxes. It sounds like the box; /archives//html/Amps/2001-10/msg00055.html (7,777 bytes)
155. [AMPS] Problem with AL-811H (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Wed, 3 Oct 2001 17:03:26 -0400; That isn't the problem being described Carl. The tubes arced, and the diode that protects the meters is now shorted. -- FAQ on WWW: http://www.contesting.com/FAQ/amps Submissions: amps@contesting.com; /archives//html/Amps/2001-10/msg00056.html (7,621 bytes)
156. [AMPS] Noises in electrolytic capacitors (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Wed, 3 Oct 2001 20:21:36 -0400; Maybe so. The high failure resistors from Amp Supply and Ameritron's original AL80 were brand new IRC resistors from surplus channels. Same for some Vectronics and Viewstar parts. My point is you ju; /archives//html/Amps/2001-10/msg00061.html (9,245 bytes)
157. [AMPS] vom check of 3-500Z tubes (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Fri, 5 Oct 2001 10:28:31 -0400; Most likely you have a gas problem with the tubes. That is normal for tubes that sit a long time, especially tubes that might have had the seals operated at elevated temperatures prior to sitting. Y; /archives//html/Amps/2001-10/msg00081.html (7,866 bytes)
158. [AMPS] Tuned Input Circuit Q (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Fri, 5 Oct 2001 21:02:34 -0400; Hi Jeff, Most Handbooks use the Q of one end of the network as the Q, but that is actually incorrect. The actual Q involves all parts of the system. Eimac almost certainly is using the entire networ; /archives//html/Amps/2001-10/msg00105.html (9,859 bytes)
159. [AMPS] Finding the Q of a Coil (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Mon, 8 Oct 2001 04:52:00 -0400; This is one of the cases I have found where you had just better measure the component. It seems is difficult if not virtually impossible to get close to actual component Q using formulas. Many thing; /archives//html/Amps/2001-10/msg00163.html (9,842 bytes)
160. [AMPS] Tuned Input Circuit Q (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Mon, 8 Oct 2001 04:52:00 -0400; None of that matters Phil, because none of that means anything. None of them are concerned about what improper Q or circuit style would do. The only potential problems are a lack of maximum efficien; /archives//html/Amps/2001-10/msg00164.html (9,227 bytes)

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