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281. [Amps] SB-200 Problem (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Mon, 4 Mar 2002 17:52:30 -0800; ? Newer 572Bs reportedly have more gain than those produced in days of yore, More gain means more ability to regenerate/oscillate. My un-expert guess is that your new tubes had an intermittent VHF p; /archives//html/Amps/2002-03/msg00061.html (10,040 bytes)
282. [Amps] SB-200 Problem (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Mon, 4 Mar 2002 23:14:45 -0800; could ? no RF input is needed when it makes its own. cheers, Chuck; /archives//html/Amps/2002-03/msg00069.html (10,957 bytes)
283. [Amps] SB-200 Problem (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Mon, 4 Mar 2002 23:15:18 -0800; ? With no RF drive, the abrupt change in DC anode current from 0 to idling/ZSAC current rings the SB-200's anode-resonance at c. 100MHz. This DC change rings this resonant circuit producing a damped; /archives//html/Amps/2002-03/msg00070.html (9,868 bytes)
284. [Amps] Blowers (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Tue, 5 Mar 2002 00:42:15 -0800; ? A blower is too large when it blows the tube out of the socket. - R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6K, www.vcnet.com/measures. end; /archives//html/Amps/2002-03/msg00072.html (7,745 bytes)
285. [Amps] SB-200 Problem (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Tue, 5 Mar 2002 06:53:35 -0800; way, that. ? the sticky wicket is that the c. 100MHz energy never sees the 50? load because the tank is a low-pass filter config. internal ? amen warm....... ? However, the loss of a couple of perce; /archives//html/Amps/2002-03/msg00084.html (9,104 bytes)
286. [Amps] Blowers (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Tue, 5 Mar 2002 06:53:37 -0800; ? Typical centrifugal blower design is such that that under a critical delivery rate, air pressure drops due to cavitation. In other words, it may take some holes in the chassis (preferably under th; /archives//html/Amps/2002-03/msg00085.html (8,160 bytes)
287. [Amps] SB-200 Problem (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Tue, 5 Mar 2002 07:31:46 -0800; ? True. The SB220 typically get squirrely on 40m. ? To see what's up, measure the resonance at the DC blocking cap. My guess is that it's c. 100MHz, +/- 20MHz. This will be the most likely place to; /archives//html/Amps/2002-03/msg00088.html (9,604 bytes)
288. [Amps] SB-200 Problem (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Tue, 5 Mar 2002 08:04:26 -0800; ? What's the XL of the typical HF tank L at 100MHz? What is the XC of the typical HF Load-C at 100MHz? - R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6K, www.vcnet.com/measures. end; /archives//html/Amps/2002-03/msg00092.html (8,298 bytes)
289. [Amps] Blowers (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Tue, 5 Mar 2002 08:04:24 -0800; ? Maximum load on a blower is with free flow delivery. During a cavitation condition, the airflow stalls and, since the motor is not working as hard, it speeds up slightly. Also, the typical motor h; /archives//html/Amps/2002-03/msg00093.html (9,192 bytes)
290. [Amps] 7094 Tube (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Tue, 5 Mar 2002 12:18:43 -0800; An 813 with more emission. - R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6K, www.vcnet.com/measures. end; /archives//html/Amps/2002-03/msg00101.html (6,634 bytes)
291. [Amps] Fans for 4cx1000/1500 question (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Tue, 5 Mar 2002 12:45:48 -0800; ? Eimac provides a number of pressure vs cfm points in their spec sheets. - R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6K, www.vcnet.com/measures. end; /archives//html/Amps/2002-03/msg00102.html (8,863 bytes)
292. [Amps] Blowers (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Tue, 5 Mar 2002 12:45:50 -0800; ? The motor's radial-wheel cooling system does not stall at all. ? Cavitation is largely caused by too much restriction to flow. - R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6K, www.vcnet.com/me; /archives//html/Amps/2002-03/msg00103.html (7,955 bytes)
293. [Amps] Fans for 4cx1000/1500 question (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Tue, 5 Mar 2002 17:33:50 -0800; ? for some tubes, air is specified as blown from cathode to anode. . - R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6K, www.vcnet.com/measures. end; /archives//html/Amps/2002-03/msg00109.html (9,916 bytes)
294. [Amps] Glitch resistors (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Wed, 6 Mar 2002 12:02:46 -0800; ? To test a glitch resistor, short the HV+ to gnd. [Before doing this test, install suitable glitch diodes across the meters and across the grid current and anode/plate current shunt resistors] The; /archives//html/Amps/2002-03/msg00115.html (9,086 bytes)
295. [Amps] Glitch resistors (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Wed, 6 Mar 2002 13:21:19 -0800; ? When an overloaded glitch resistor is in the process of exploding, a metal-vapour arc briefly takes place. The V-drop across such an arc is c. 20 volts. Thus, the arc does not do much to limit pea; /archives//html/Amps/2002-03/msg00118.html (10,087 bytes)
296. [Amps] Glitch resistors (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Wed, 6 Mar 2002 15:35:04 -0800; ? The right one for the job passes the test unscathed. A typical 3-500Z amplifier PS will not damage a 10 - 15 ohm 10w glass-coated resistor in the screwdriver to ground test. - R. L. Measures, a.k.; /archives//html/Amps/2002-03/msg00121.html (9,187 bytes)
297. [Amps] 10 Stages of a DXer (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Thu, 7 Mar 2002 06:58:21 -0800; Editorial: I went to High School with daughters of HF DXers. According to their girlfriends, both seemingly had bad-news baggage in the closet. I also knew the daughter of a prominent VHF/UHF DXer w; /archives//html/Amps/2002-03/msg00125.html (6,930 bytes)
298. [Amps] Too much filtering (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Thu, 7 Mar 2002 08:32:34 -0800; ? no. I used the step-start circuit shown in Figure 1 on my Web site to step-start a 14kW amplifier. Since this circuit's step-point is principally determined by the HV filter capacitor, it will wor; /archives//html/Amps/2002-03/msg00128.html (7,084 bytes)
299. [Amps] Air Chimneys for 3-500Z and Anode Dissipation (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Thu, 7 Mar 2002 15:13:33 -0800; ? to test the cooling on the filament seals, after about 5-min. of standby, briefly touch one of the filament pins. If it's painfully hot, the cooling is not wonderful. - R. L. Measures, a.k.a. Rich; /archives//html/Amps/2002-03/msg00143.html (8,214 bytes)
300. [Amps] Source for 220V cords (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Thu, 7 Mar 2002 15:13:35 -0800; Changing the cord set is a bigger job than changing the plug to a 20A, 240v type. - R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6K, www.vcnet.com/measures. end; /archives//html/Amps/2002-03/msg00144.html (8,518 bytes)

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