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161. [Amps] TL922A and AL80A (score: 127): Author: 2 at vc.net (rlm); Date: Wed Mar 19 21:35:06 2003; My TL-922 produces c. 1400w-pep in either AM or SSB. In AM, the carrier level is c. 350w, and the indicated anode/plate current with or without modulation is 400mA. Tuneup for both involves sending; /archives//html/Amps/2003-03/msg00719.html (9,125 bytes)
162. [Amps] TL922A and AL80A (score: 127): Author: 2 at vc.net (rlm); Date: Wed Mar 19 10:32:46 2003; ** for RTTY contesting, yes. ** Operating the tubes within their linear region makes for good linearity. 3-500Z/8002 IMD is over 42db down, which is better than virtually all radios. ** It would be; /archives//html/Amps/2003-03/msg00708.html (9,445 bytes)
163. [Amps] TL922A and AL80A (score: 127): Author: 2 at vc.net (rlm); Date: Wed Mar 19 07:41:01 2003; ** True ** So the amplifier was designed beyond the tube's ratings? ** ... and remember, there is such thing as a VHF oscillation in a HF amplifier. ** Not according to the characteristic curves. **; /archives//html/Amps/2003-03/msg00702.html (11,358 bytes)
164. [Amps] TL922A and AL80A (score: 127): Author: 2 at vc.net (rlm); Date: Wed Mar 19 07:40:44 2003; The 922's HV-xfmr is ok with voice mode on the SSB tap and CW mode on the CW tap, however, since key-down/A? mode has about triple the current draw, the I^2 x R Cu-loss in the windings is substantia; /archives//html/Amps/2003-03/msg00701.html (10,783 bytes)
165. [Amps] Silly idea? (score: 127): Author: 2 at vc.net (rlm); Date: Tue Mar 18 21:03:14 2003; ** Everything a man said or wrote may be used against him. ** In a debate about about parasites in amplifiers such things were said. I got on the phone and talked to Varian's personel office in SLC.; /archives//html/Amps/2003-03/msg00695.html (7,866 bytes)
166. [Amps] Re: Filament Current Limiting (score: 127): Author: 2 at vc.net (rlm); Date: Tue Mar 18 21:02:57 2003; ** mo' words ain't always mo' betta. cheers, Dave - R. L. Measures, a.k.a. Rich..., 805.386.3734, AG6K, www.vcnet.com/measures. end; /archives//html/Amps/2003-03/msg00694.html (10,411 bytes)
167. [Amps] 813 No parasitics (score: 127): Author: 2 at vc.net (rlm); Date: Tue Mar 18 21:00:38 2003; The filters are bandpass filters. Shorted capacitors pass everything. - R. L. Measures, a.k.a. Rich..., 805.386.3734, AG6K, www.vcnet.com/measures. end; /archives//html/Amps/2003-03/msg00693.html (8,030 bytes)
168. [Amps] Silly idea? (score: 127): Author: 2 at vc.net (rlm); Date: Tue Mar 18 14:05:59 2003; ** Those who are chagrined by it despise history. Some people are honest, and some people are not. ** Be not sorry. Such is not off topic. cheerz, Ian. - R. L. Measures, a.k.a. Rich..., 805.386.3734; /archives//html/Amps/2003-03/msg00683.html (8,607 bytes)
169. [Amps] Silly idea? (score: 127): Author: 2 at vc.net (rlm); Date: Tue Mar 18 11:04:39 2003; The current limiting fil transformer in the SB-220 uses a core that looks different than the (convention-looking) HV-transformer core. My guess is that, since winding-R seems to be fairly normal, the; /archives//html/Amps/2003-03/msg00676.html (8,220 bytes)
170. [Amps] 813 No parasitics (score: 127): Author: 2 at vc.net (rlm); Date: Tue Mar 18 10:51:45 2003; I would think so. However, there have been more than a few reports of this occurrence with solid-state radios. Perhaps the reason is that Chebyshev and Butterworth band-pass filters used in solid-sta; /archives//html/Amps/2003-03/msg00674.html (10,482 bytes)
171. [Amps] WTB Millen H.V. connectors (score: 127): Author: 2 at vc.net (rlm); Date: Tue Mar 18 10:36:32 2003; ** Millen HV connectors are made from hygroscopic material. - R. L. Measures, a.k.a. Rich..., 805.386.3734, AG6K, www.vcnet.com/measures. end; /archives//html/Amps/2003-03/msg00673.html (6,818 bytes)
172. [Amps] 813 No parasitics (score: 127): Author: 2 at vc.net (rlm); Date: Tue Mar 18 08:28:22 2003; A grid-driven 813 has 0.2pF of (output-input) feedback-C, and even less feedback-C in G-G configuration with both grids grounded.. This is similar to the feedback-C of modern tubes which have 4 to 1; /archives//html/Amps/2003-03/msg00666.html (9,413 bytes)
173. [Amps] Silly idea? (score: 127): Author: 2 at vc.net (rlm); Date: Tue Mar 18 08:28:04 2003; ** During the Grate Debate, on 6 Dec, 1966, Mr Tom Rauch said: "As we can plainly see, I did post three names of Varian engineers who totally disagree with Richard (Reid Brandon, Buzz Miklos, and Jo; /archives//html/Amps/2003-03/msg00665.html (9,828 bytes)
174. [Amps] 813 No parasitics (score: 127): Author: 2 at vc.net (rlm); Date: Tue Mar 18 08:27:49 2003; The 811A & 572B being examples. On the other hand, G-G triodes with a low-L grid that have substantial VHF gain can also become squirrely in HF amplifiers. The 3cx1500A7, 3cx3000A7 and the 3cx6000A7; /archives//html/Amps/2003-03/msg00664.html (8,751 bytes)
175. [Amps] Silly idea? (score: 127): Author: 2 at vc.net (rlm); Date: Mon Mar 17 23:00:59 2003; powered, The SB-220 uses a current-limiting type fil xfmr that limits inrush current to 60% of what is allowed in the 3-500Z's technical specifications. - R. L. Measures, a.k.a. Rich..., 805.386.373; /archives//html/Amps/2003-03/msg00657.html (8,639 bytes)
176. [Amps] Silly idea? (score: 127): Author: 2 at vc.net (rlm); Date: Mon Mar 17 20:45:11 2003; ** Early Heath SB-220s had numerous fil-grid shorts in Eimac 3-500Zs. Sound advice. - R. L. Measures, a.k.a. Rich..., 805.386.3734, AG6K, www.vcnet.com/measures. end; /archives//html/Amps/2003-03/msg00654.html (9,985 bytes)
177. [Amps] Silly idea? (score: 127): Author: 2 at vc.net (rlm); Date: Mon Mar 17 20:45:01 2003; I have never seen a 3-500Z fail from an open filament -- except when the fan does not keep the fil pins cool enough and the solder melts. However, such tubes can be resoldered. - R. L. Measures, a.k.; /archives//html/Amps/2003-03/msg00653.html (10,092 bytes)
178. [Amps] SB-200 Question (score: 127): Author: 2 at vc.net (rlm); Date: Mon Mar 17 19:51:41 2003; Amen, Doug. Keying relays are too slow for high-speed switching. - R. L. Measures, a.k.a. Rich..., 805.386.3734, AG6K, www.vcnet.com/measures. end; /archives//html/Amps/2003-03/msg00650.html (8,465 bytes)
179. [Amps] Mailing list for parasitic osciallations. (score: 127): Author: 2 at vc.net (rlm); Date: Mon Mar 17 10:38:26 2003; The newest thing I've seen is the claim that Ni-Cr alloys have Less RF-R as frequency Increases. good for you, David - R. L. Measures, a.k.a. Rich..., 805.386.3734, AG6K, www.vcnet.com/measures. end; /archives//html/Amps/2003-03/msg00629.html (8,450 bytes)
180. [Amps] Some Advice Needed (score: 127): Author: 2 at vc.net (rlm); Date: Mon Mar 17 10:33:21 2003; A suitable chimney can be made from a food-storage container that is microwave oven safe. Such containers can be cut as needed with a dedicated low-temp pencil-point soldering-iron tip. (Cost of cont; /archives//html/Amps/2003-03/msg00628.html (8,890 bytes)

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