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21. [Amps] Plate voltage question (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Thu, 4 Jul 2002 21:01:48 -0700; yes not unless the anode supply is regulated. The 0hms in the transformer and the Ohms in the mains creates an I x R voltage drop. 10% regulation is typical. - R. L. Measures, a.k.a. Rich..., 805.38; /archives//html/Amps/2002-07/msg00065.html (7,074 bytes)
22. [Amps] 4-250A question (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Fri, 5 Jul 2002 04:48:56 -0700; Piece o' cake. One can buck it in the primary or add R is series with the bifilar fil choke to bring it down to c. 4.8v. I use small gauge TFE wire for the latter purpose. At 15Arms #22 TFE runs war; /archives//html/Amps/2002-07/msg00067.html (9,085 bytes)
23. [Amps] 3-400Z vs. 4-400A (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Fri, 5 Jul 2002 11:42:56 -0700; In g-g, at 0v bias, the 4-400A needs c. 3400V to idle at the requisite 75mA. - R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6K, www.vcnet.com/measures. end; /archives//html/Amps/2002-07/msg00072.html (7,919 bytes)
24. [Amps] 3-400Z vs. 4-400A (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Fri, 5 Jul 2002 18:13:31 -0700; Adding bias to raise the ZSAC to 75mA/tube with 3000VDC would require connecting a 1A, 1 - 3 volt neg. polarity PS to the CT/cathode return. - R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6K, www.; /archives//html/Amps/2002-07/msg00075.html (8,560 bytes)
25. [Amps] 3-400Z vs. 4-400A (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Sat, 6 Jul 2002 10:39:48 -0700; If I were going to the trouble, I would add c. a potted 200V/1A transformer in series with the extant secondary. This would add enough DCV to make it fly with zero V bias. - R. L. Measures, a.k.a. R; /archives//html/Amps/2002-07/msg00084.html (9,492 bytes)
26. [Amps] 3-400Z vs. 4-400A (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Sat, 6 Jul 2002 10:39:52 -0700; Those who spread Bandini around rose bushess can expect larger blooms. Those who spread it here can expect to be marginalized quite soon. To: <amps@contesting.com> - R. L. Measures, a.k.a. Rich..., 8; /archives//html/Amps/2002-07/msg00085.html (11,017 bytes)
27. [Amps] 3-400Z vs. 4-400A (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Sat, 6 Jul 2002 10:39:50 -0700; To: <amps@contesting.com> Such has been known to occasionally happen. I try to promote the idea of bipedal mammals using their own horse sense. cheers, Lane - R. L. Measures, a.k.a. Rich..., 805.386; /archives//html/Amps/2002-07/msg00086.html (9,193 bytes)
28. [Amps] 3-400Z vs. 4-400A (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Sat, 6 Jul 2002 10:39:54 -0700; * More gain is obtained with DC screen V applied only if the RF driving signal is applied between the control grid and the screen grid. With both grids at RF-ground and the cathode driven, this does; /archives//html/Amps/2002-07/msg00087.html (12,082 bytes)
29. [Amps] Tube characterization (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Sat, 6 Jul 2002 10:39:56 -0700; * Chortle. - R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6K, www.vcnet.com/measures. end; /archives//html/Amps/2002-07/msg00088.html (7,166 bytes)
30. [Amps] Tube characterization (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Sat, 6 Jul 2002 16:13:15 -0700; All of the characteristic curves one needs are free on the Internet. - R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6K, www.vcnet.com/measures. end; /archives//html/Amps/2002-07/msg00094.html (8,361 bytes)
31. [Amps] 3-400Z vs. 4-400A (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Sat, 6 Jul 2002 16:15:08 -0700; Tantalum plates normally show color when they are at work. What was the Zero-Signal Anode-Current [ZSAC] with the 4-250A's, Firson? thanks - R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6K, www.vc; /archives//html/Amps/2002-07/msg00095.html (8,003 bytes)
32. [Amps] Tube characterization (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Sat, 6 Jul 2002 16:15:09 -0700; Chortle. If PT Barnum was right, ... ... ... . cheers - R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6K, www.vcnet.com/measures. end; /archives//html/Amps/2002-07/msg00096.html (6,807 bytes)
33. [Amps] Fw: Yeasu 2100B (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Sun, 7 Jul 2002 05:18:32 -0700; A single band problem suggests a problem in the tank. I would re-inspect the bandswitch with an inspection mirror and a flashlight, There could be a vapourized contact. If there is, Murphy's law says; /archives//html/Amps/2002-07/msg00101.html (8,050 bytes)
34. [Amps] 3-400Z vs. 4-400A (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Sun, 7 Jul 2002 12:15:07 -0700; As I recall, the Tune-Caps appear to be identical between the 2k-4 and the 3k-A, which uses a higher DC supply voltage. There can be no screen-grid amplification unless the AC driving potential exis; /archives//html/Amps/2002-07/msg00106.html (9,114 bytes)
35. [Amps] 572B Tube Failure ? (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Sun, 7 Jul 2002 12:15:09 -0700; What is the resistance of the filament in this tube? tnx, Jim - R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6K, www.vcnet.com/measures. end; /archives//html/Amps/2002-07/msg00107.html (7,344 bytes)
36. [Amps] 3-400Z vs. 4-400A (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Sun, 7 Jul 2002 16:37:51 -0700; Thanks, Firson. The recommended ZSAC is 75mA. To: <amps@contesting.com> - R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6K, www.vcnet.com/measures. end; /archives//html/Amps/2002-07/msg00110.html (8,934 bytes)
37. [Amps] My new Toy. Off Topic... (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Mon, 8 Jul 2002 06:07:31 -0700; Your friends will tell you when your zipper is down. - R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6K, www.vcnet.com/measures. end; /archives//html/Amps/2002-07/msg00115.html (8,734 bytes)
38. [Amps] Personal insults. (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Mon, 8 Jul 2002 08:48:13 -0700; Do you become affronted when someone tells you that your zipper is down, David? - R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6K, www.vcnet.com/measures. end; /archives//html/Amps/2002-07/msg00123.html (7,031 bytes)
39. [Amps] Zero Bias Amps Question (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Mon, 8 Jul 2002 09:38:28 -0700; 3-400Zs have a Mu of c. 190. They have a ZSAC of c. 80mA each at 3kVDC and 0V g-fil bias. Less ZSAC is ok for CW, but not ok for SSB. - R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6K, www.vcnet.c; /archives//html/Amps/2002-07/msg00125.html (7,573 bytes)
40. [Amps] Zero Bias Amps Question (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Mon, 8 Jul 2002 13:26:13 -0700; No difference means there may be a miswire because each diode makes c. 0.7v drop and even 0.7v should noticably change the ZSAC. - note -- The diode string needs to connect between the fil CT and th; /archives//html/Amps/2002-07/msg00129.html (9,233 bytes)

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