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1. [Amps] Is This 4CX1600B Still Good? (score: 1): Author: Mike <k4gmh@arrl.net>; Date: Tue, 22 Nov 2005 15:34:46 -0500; Hello, Need guidance on whether the tube, 4CX1600B, is still good after an amp. failure during the ARRL Sweepstakes SSB Contest. When the amp. went out there weren't any flashes or smoke just no outp; /archives//html/Amps/2005-11/msg00444.html (8,000 bytes)
2. Re: [Amps] Is This 4CX1600B Still Good? (score: 1): Author: TexasRF@aol.com; Date: Tue, 22 Nov 2005 15:53:14 EST; Hi Mike, all of your voltage readings should be measured from the cathode terminal or as close to the cathode terminal as possible. There are several failure scenarios that would allow those voltage; /archives//html/Amps/2005-11/msg00445.html (8,301 bytes)
3. Re: [Amps] Is This 4CX1600B Still Good? (score: 1): Author: Mike <k4gmh@arrl.net>; Date: Tue, 22 Nov 2005 16:23:36 -0500; Hello, Thanks for the heads-up. 73, Mike, K4GMH _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps; /archives//html/Amps/2005-11/msg00446.html (9,974 bytes)
4. Re: [Amps] Is This 4CX1600B Still Good? (score: 1): Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>; Date: Tue, 22 Nov 2005 21:51:30 +0000; Hello Mike Please can you let me have more specifics about which components had failed? -- 73 from Ian GM3SEK _______________________________________________ Amps mailing list Amps@contesting.com htt; /archives//html/Amps/2005-11/msg00448.html (8,727 bytes)
5. Re: [Amps] Is This 4CX1600B Still Good? (score: 1): Author: Mark Hill <g4fph@mjha.co.uk>; Date: Wed, 23 Nov 2005 10:22:11 +0000; Mike, Is the heater of the 4CX glowing? Regards. Mark. ** Mark Hill - G4FPH E-mail: g4fph@mjha.co.uk Current web pages at: www.g4fph.net Old web pages at: www.qsl.net/g4fph -- Dipoles resonant on 194; /archives//html/Amps/2005-11/msg00450.html (8,299 bytes)
6. Re: [Amps] Is This 4CX1600B Still Good? (score: 1): Author: Mike <k4gmh@arrl.net>; Date: Wed, 23 Nov 2005 09:36:51 -0500; Hello Mark, Filament in tube measures ~2.5 Ohms and the correct voltage is on the filament "pins" in the socket. Haven't measured the filament voltage at the tube for a while. It was done when settin; /archives//html/Amps/2005-11/msg00455.html (9,479 bytes)
7. Re: [Amps] Is This 4CX1600B Still Good? (score: 1): Author: gdaught6@stanford.edu; Date: Wed, 23 Nov 2005 08:50:19 -0800; How would one know? The tube is colored ceramic. Disconnect the HV!!! Then you could turn it on for a few minutes and see if it gets warm. NOTICE!!!: Disconnect and or DISCHARGE the HV before you sti; /archives//html/Amps/2005-11/msg00458.html (7,761 bytes)
8. Re: [Amps] Is This 4CX1600B Still Good? (score: 1): Author: Mike <k4gmh@arrl.net>; Date: Wed, 23 Nov 2005 15:39:32 -0500; Hello George, Safely checked and the tube is warm after three minute warm up. Earlier had measured the resistance of the tube to be ~2.3 Ohms. 73, Mike, K4GMH ________________________________________; /archives//html/Amps/2005-11/msg00471.html (8,640 bytes)
9. Re: [Amps] Is This 4CX1600B Still Good? (score: 1): Author: "Dennis" <pegasus@mho.net>; Date: Thu, 24 Nov 2005 09:08:24 -0700 (MST); I'm not sure, but 2.3 ohms on a cold filament of a tube that size seems a bit high. I've never measured the cold resistance on a 12 volt filament transmitting tube, (only 5 or 7 volt tubes) but it s; /archives//html/Amps/2005-11/msg00482.html (8,001 bytes)
10. Re: [Amps] Is This 4CX1600B Still Good? (score: 1): Author: "k7fm" <k7fm@teleport.com>; Date: Thu, 24 Nov 2005 09:14:02 -0800; "I'm not sure, but 2.3 ohms on a cold filament of a tube that size seems a bit high. I've never measured the cold resistance on a 12 volt filament transmitting tube, (only 5 or 7 volt tubes) but it s; /archives//html/Amps/2005-11/msg00483.html (8,681 bytes)
11. Re: [Amps] Is This 4CX1600B Still Good? (score: 1): Author: gdaught6@stanford.edu; Date: Thu, 24 Nov 2005 11:47:28 -0800; That's close. It could have continuity and still be bad (but not likely); and remember that the resistance goes up a lot when the filament gets hot. 73, George T. Daughters, K6GT ____________________; /archives//html/Amps/2005-11/msg00484.html (8,237 bytes)
12. Re: [Amps] Is This 4CX1600B Still Good? (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Thu, 24 Nov 2005 23:01:12 +0000; Measuring the heater current would likely prove it one way or another. It's worth doing tests both in and out of the amp if you can - that might show some oddity in the connections. Out of the amp, g; /archives//html/Amps/2005-11/msg00485.html (9,003 bytes)

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