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341. [AMPS] Alpha 374 bias (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Fri, 15 Mar 2002 17:32:05 -0800; ? Remove the original bias circuit and replace it with something simple that works. The electronic cathode bias switch (ECBS) shown in Figure 7 on my Web site will do this job silently, cuts the cur; /archives//html/Amps/2002-03/msg00366.html (7,387 bytes)
342. [Amps] 3-500Z amps (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Sat, 16 Mar 2002 15:39:15 -0800; ? An FT-1000D will drive three at 3KVDC. - R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6K, www.vcnet.com/measures. end; /archives//html/Amps/2002-03/msg00375.html (6,339 bytes)
343. [Amps] Henry 3K-A (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Sat, 16 Mar 2002 15:39:12 -0800; ? The 3K-A is the only Ham amplifier I know of with a 2500W CCS anode supply. Normal full throttle is c. 2k out. It is also a good performer on a 20a, 120v outlet -- provided one tunes the beast up; /archives//html/Amps/2002-03/msg00376.html (9,251 bytes)
344. [Amps] 3-500Z amps (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Sat, 16 Mar 2002 17:05:07 -0800; ? More anode-V means less drive needed for a triode in g-g config. More Anode-V also means less grid-current and higher efficiency. - R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6K, www.vcnet.com; /archives//html/Amps/2002-03/msg00379.html (7,160 bytes)
345. [Amps] Henry 2k p.s. questions (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Sun, 17 Mar 2002 21:52:20 -0800; To test a HV rectifier stack in the fwd direction, one needs around 1v per kV of piv rating, limited to c. 0.5A with a series resistor. The V-drop across the stack should be c. 0.7v per kV @ 0.5A. T; /archives//html/Amps/2002-03/msg00390.html (9,478 bytes)
346. [Amps] Tuned Inputs (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Sun, 17 Mar 2002 21:52:18 -0800; ? Input Z is an average of the instantaneous E/I cathode input ratios during the 360º of the sinewave driving-cycle. Typical numbers are 25?s at the neg. crest to >1M? at the positive crest whe; /archives//html/Amps/2002-03/msg00391.html (7,652 bytes)
347. [Amps] Henry 3K-A (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Mon, 18 Mar 2002 11:04:47 -0800; ? We ain't supposed to talk about that, because then people would realize that there are big boys who run somewhat more than 1400w during contests and DX pileups. When I was running the 20db tetrode; /archives//html/Amps/2002-03/msg00402.html (8,313 bytes)
348. [Amps] Henry 2k p.s. questions (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Mon, 18 Mar 2002 11:04:50 -0800; Divide and conquer - the granite foundation of logical troublshooting. yes Fwd, yes. Reverse takes a high-pot tester. My guess is that the problem is moisture absorbption in either the HV xfmr or th; /archives//html/Amps/2002-03/msg00403.html (7,771 bytes)
349. [Amps] Henry 3K-A (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Mon, 18 Mar 2002 11:52:36 -0800; ? One guy called me a damn liar because "no Ham would ever admit to running one of those". ? I attributed my signal to a 562w filament transformer. An incredible mechanical design. For an AB1 grid-d; /archives//html/Amps/2002-03/msg00405.html (9,546 bytes)
350. [Amps] Alpha 87A won't start (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Tue, 19 Mar 2002 05:31:28 -0800; ? If I were troubleshooting this amp, the first thing I would try is removing the tubes. If all of the operating potentials are not there without tubes, one has some homework to do before the tubes; /archives//html/Amps/2002-03/msg00414.html (7,062 bytes)
351. [Amps] transmatch (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Tue, 19 Mar 2002 10:52:26 -0800; ? is usually low-pass ? is usually high-pass. -- High-pass is better for 160m if one lives near a high-power AM BC station. - R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6K, www.vcnet.com/measure; /archives//html/Amps/2002-03/msg00427.html (7,159 bytes)
352. [Amps] Tuned Input ? (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Tue, 19 Mar 2002 18:44:12 -0800; ? Silver-micas or NPØ disc ceramics are ok. Nebraska is one source if you like to pay more than list price. Fair Radio Sales is worth a try. - R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6; /archives//html/Amps/2002-03/msg00432.html (7,396 bytes)
353. [Amps] SB220 Question (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Wed, 20 Mar 2002 13:15:54 -0800; ? A fuse will not prevent damage** to the tubes. A fine wire will not prevent damage to the tubes because it is essentially a fuse.. A glitch resistor - that can pass the screwdriver test - will pre; /archives//html/Amps/2002-03/msg00441.html (7,094 bytes)
354. [Amps] SB220 Question... fuses (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Wed, 20 Mar 2002 16:59:09 -0800; ? chortle. - Furthermore, when a 250v fuse is used to interrupt current flow from a tyoical 2500v anode supply, before the fuse can interrupt the flow of current, a metal-vapour arc takes place insi; /archives//html/Amps/2002-03/msg00444.html (9,243 bytes)
355. [Amps] Henry 2KD Classic (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Thu, 21 Mar 2002 07:09:54 -0800; ? I would check these potentials against a DMM with a x10 HV probe. The trouble could be in the metering scheme. - 20k-ohm makes much heat. Electrolytics do not tolerate heat well. I would go to a h; /archives//html/Amps/2002-03/msg00461.html (8,618 bytes)
356. [Amps] SB220 Question... fuses (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Thu, 21 Mar 2002 09:19:06 -0800; ? amen, Leon. - R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6K, www.vcnet.com/measures. end; /archives//html/Amps/2002-03/msg00470.html (7,106 bytes)
357. [Amps] Henry 2KD Classic (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Thu, 21 Mar 2002 13:04:05 -0800; They typically lose C and/or the leakage current increases. When the leakage current increases, more internal heat is developed, which generates more leakage, which generates more heat, on and on an; /archives//html/Amps/2002-03/msg00479.html (8,045 bytes)
358. [Amps] SB-220 for WARC bands (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Thu, 21 Mar 2002 19:00:40 -0800; It already works ok, except on 30m, the operating Q is a bit high. - R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6K, www.vcnet.com/measures. end; /archives//html/Amps/2002-03/msg00490.html (7,105 bytes)
359. [Amps] QRO (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Fri, 22 Mar 2002 15:07:01 -0800; ? Does the circuit diagram match the circuit in the amplifier ? - R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6K, www.vcnet.com/measures. end; /archives//html/Amps/2002-03/msg00513.html (6,660 bytes)
360. [Amps] SB-220 metering (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Fri, 22 Mar 2002 15:07:03 -0800; cheers, Pete - R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6K, www.vcnet.com/measures. end; /archives//html/Amps/2002-03/msg00514.html (6,970 bytes)

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