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Total 18 documents matching your query.

1. [Amps] Checking Filament Voltage (score: 1): Author: Roger Parsons via Amps <amps@contesting.com>; Date: Sun, 19 Feb 2017 16:10:02 +0000 (UTC); I am busily making a replacement amplifier using a metal/ceramic filament tube. I would like to coarsely adjust the filament voltage before I install the blower. (The amp is built into an existing ca; /archives//html/Amps/2017-02/msg00144.html (6,935 bytes)
2. [Amps] Checking Filament Voltage (score: 1): Author: "Jim Thomson" <jim.thom@telus.net>; Date: Sun, 19 Feb 2017 09:34:03 -0800; I am busily making a replacement amplifier using a metal/ceramic filament tube. I would like to coarsely adjust the filament voltage before I install the blower. (The amp is built into an existing ca; /archives//html/Amps/2017-02/msg00145.html (8,509 bytes)
3. Re: [Amps] Checking Filament Voltage (score: 1): Author: Steve Wright <stevewrightnz@gmail.com>; Date: Mon, 20 Feb 2017 12:48:37 +1300; The filament current draw and corresponding terminal voltage will vary according to filament temperature anyway, so if you do run it for a short time, then at full temperature it will be different ag; /archives//html/Amps/2017-02/msg00146.html (7,799 bytes)
4. Re: [Amps] Checking Filament Voltage (score: 1): Author: "Jim W7RY" <jimw7ry@gmail.com>; Date: Sun, 19 Feb 2017 21:09:48 -0600; I just put the jacks on the back of my 8877 amplifier. I just dont drive the amplifier when I'm measuring filament voltage. The leads are only 2 inches long. Simple! 73 Jim W7RY I am busily making a; /archives//html/Amps/2017-02/msg00147.html (10,274 bytes)
5. [Amps] Checking Filament Voltage (score: 1): Author: John Lyles <jtml@losalamos.com>; Date: Sun, 19 Feb 2017 22:55:47 -0700; This is probably a bad idea, for tubes over a few hundred watts power rating. Most ceramic metal tubes require cooling under the base, and for a few minutes, might still overheat the cathode/heater.; /archives//html/Amps/2017-02/msg00148.html (7,879 bytes)
6. [Amps] Checking Filament Voltage (score: 1): Author: Roger Parsons via Amps <amps@contesting.com>; Date: Mon, 20 Feb 2017 15:06:58 +0000 (UTC); Many thanks for many replies received both direct and via the reflector. However, I'm not sure that I can reach a definitive conclusion! The tube in question is a 4CX1500A - purely because I happen t; /archives//html/Amps/2017-02/msg00150.html (8,163 bytes)
7. Re: [Amps] Checking Filament Voltage (score: 1): Author: Steve Wright <stevewrightnz@gmail.com>; Date: Tue, 21 Feb 2017 04:54:20 +1300; You need taps. Did you didn't wind the filament transformer? If you didn't, how will you control in anyway? If you didn't, what's the point of the question, or at least, what are you going to do abou; /archives//html/Amps/2017-02/msg00152.html (7,811 bytes)
8. Re: [Amps] Checking Filament Voltage (score: 1): Author: Roger Parsons via Amps <amps@contesting.com>; Date: Mon, 20 Feb 2017 16:59:38 +0000 (UTC); < You need taps. Did you didn't wind the filament transformer? If you didn't, how will you control in anyway? If you didn't, what's the point of the question, or at least, what are you going to do ab; /archives//html/Amps/2017-02/msg00153.html (8,555 bytes)
9. Re: [Amps] Checking Filament Voltage (score: 1): Author: Bill Turner <dezrat@outlook.com>; Date: Mon, 20 Feb 2017 23:59:27 +0000; Apparently your filament transformer is separate from other transformers (plate). I'd suggest running the AC line outside the amp and using a Variac. The drawback to taps is your line voltage can var; /archives//html/Amps/2017-02/msg00155.html (8,253 bytes)
10. [Amps] Checking Filament Voltage (score: 1): Author: "Jim Thomson" <jim.thom@telus.net>; Date: Tue, 21 Feb 2017 07:37:28 -0800; Apparently your filament transformer is separate from other transformers (plate). I'd suggest running the AC line outside the amp and using a Variac. The drawback to taps is your line voltage can var; /archives//html/Amps/2017-02/msg00161.html (9,227 bytes)
11. Re: [Amps] Checking Filament Voltage (score: 1): Author: Ron Youvan <ka4inm@gmail.com>; Date: Tue, 21 Feb 2017 12:29:06 -0500; the variac to bring the fil V up slowly each time. If the variac was pre-set to correct fil V, then a simple toggle used to switch on, dunno if the small variac would have enough Z to limit fil inru; /archives//html/Amps/2017-02/msg00162.html (8,585 bytes)
12. Re: [Amps] Checking Filament Voltage (score: 1): Author: Bill Turner <dezrat@outlook.com>; Date: Tue, 21 Feb 2017 19:08:37 +0000; -- ORIGINAL MESSAGE --(may be snipped) REPLY: IMO, if inrush current is a concern, one should install a step-start circuit rather than depend on a rheostat which might or might not be sufficient. 73,; /archives//html/Amps/2017-02/msg00164.html (8,380 bytes)
13. Re: [Amps] Checking Filament Voltage (score: 1): Author: MU 4CX250B <4cx250b@miamioh.edu>; Date: Tue, 21 Feb 2017 14:24:53 -0700; The simplest solution for amps with separate filament xfmrs is probably to install an inrush current limiter in series with the xfmr's primary winding. These look like disc capacitors and cost about; /archives//html/Amps/2017-02/msg00166.html (9,575 bytes)
14. [Amps] Checking Filament Voltage (score: 1): Author: "Jim Thomson" <jim.thom@telus.net>; Date: Tue, 21 Feb 2017 18:45:15 -0800; The simplest solution for amps with separate filament xfmrs is probably to install an inrush current limiter in series with the xfmr's primary winding. These look like disc capacitors and cost about; /archives//html/Amps/2017-02/msg00171.html (10,034 bytes)
15. Re: [Amps] Checking Filament Voltage (score: 1): Author: MU 4CX250B <4cx250b@miamioh.edu>; Date: Tue, 21 Feb 2017 20:26:04 -0700; Sent from my iPhone Very good point, Jim. Yes, ICLs run hot and must be kept out of a cooling airflow. I normally do not shorten the leads to the ICL, and insulate the leads with teflon tubing. I pos; /archives//html/Amps/2017-02/msg00173.html (10,128 bytes)
16. Re: [Amps] Checking Filament Voltage (score: 1): Author: Roger Parsons via Amps <amps@contesting.com>; Date: Fri, 3 Mar 2017 16:09:16 +0000 (UTC); I posed a question last month about whether it was permissible to run a metal ceramic tube (filament) for a short period without cooling. I received a lot of replies ranging from 'don't even think ab; /archives//html/Amps/2017-03/msg00022.html (7,732 bytes)
17. Re: [Amps] Checking Filament Voltage (score: 1): Author: Jim W7RY <jimw7ry@gmail.com>; Date: Fri, 3 Mar 2017 14:44:51 -0600; Well done! That is exactly what I would have done ! 73 Jim W7RY _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps; /archives//html/Amps/2017-03/msg00023.html (8,561 bytes)
18. [Amps] Checking Filament Voltage (score: 1): Author: "Jim Thomson" <jim.thom@telus.net>; Date: Fri, 3 Mar 2017 21:58:52 -0800; I posed a question last month about whether it was permissible to run a metal ceramic tube (filament) for a short period without cooling. I received a lot of replies ranging from 'don't even think ab; /archives//html/Amps/2017-03/msg00024.html (8,125 bytes)

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