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1. [Amps] Henry 2KD-5 Problem (score: 1): Author: ED MCKIE <kb5gt@cableone.net>; Date: Thu, 26 May 2011 17:18:05 -0500; Last night I was using my 2KD-5, and it was working fine. After making several transmissions with no problem, it made a loud pop when keyed. Now the grid current indication goes off scale in the nega; /archives//html/Amps/2011-05/msg00237.html (8,089 bytes)
2. Re: [Amps] Henry 2KD-5 Problem (score: 1): Author: "Mitch Cox" <ww4cox@embarqmail.com>; Date: Thu, 26 May 2011 18:32:14 -0400; Last night I was using my 2KD-5, and it was working fine. After making several transmissions with no problem, it made a loud pop when keyed. Now the grid current indication goes off scale in the nega; /archives//html/Amps/2011-05/msg00238.html (8,865 bytes)
3. Re: [Amps] Henry 2KD-5 Problem (score: 1): Author: TexasRF@aol.com; Date: Thu, 26 May 2011 18:38:01 EDT; Hi Ed, sounds like a leakage to ground somewhere on the B+ side of the plate supply. Perhaps a HV feed through lost it's insulation or plate bypass or some other component in the B+ circuit has devel; /archives//html/Amps/2011-05/msg00239.html (8,657 bytes)
4. Re: [Amps] Henry 2KD-5 Problem (score: 1): Author: "Mitch Cox" <ww4cox@embarqmail.com>; Date: Thu, 26 May 2011 18:41:20 -0400; Hi Ed, sounds like a leakage to ground somewhere on the B+ side of the plate supply. Perhaps a HV feed through lost it's insulation or plate bypass or some other component in the B+ circuit has devel; /archives//html/Amps/2011-05/msg00240.html (9,572 bytes)
5. Re: [Amps] Henry 2KD-5 Problem (score: 1): Author: TexasRF@aol.com; Date: Thu, 26 May 2011 18:41:14 EDT; Which can be confirmed by removing the tube(s). 73, Gerald K5GW In a message dated 5/26/2011 5:32:26 P.M. Central Daylight Time, ww4cox@embarqmail.com writes: Last night I was using my 2KD-5, and it; /archives//html/Amps/2011-05/msg00241.html (8,849 bytes)
6. Re: [Amps] Henry 2KD-5 Problem (score: 1): Author: "Jim W7RY" <w7ry@inbox.com>; Date: Thu, 26 May 2011 15:42:28 -0700; Agreed! But you can't just pull one tube at a time because the filaments are in series. You most likely have other parts destroyed by the tube short. 73 Jim W7RY _____________________________________; /archives//html/Amps/2011-05/msg00242.html (10,509 bytes)
7. Re: [Amps] Henry 2KD-5 Problem (score: 1): Author: "Mitch Cox" <ww4cox@embarqmail.com>; Date: Thu, 26 May 2011 18:55:47 -0400; Since the grids are grounded to the chassis most likely got a meter shunt resistor or 2. -- Original Message -- From: Jim W7RY To: Mitch Cox ; ED MCKIE ; amps@contesting.com Sent: Thursday, May 26, 2; /archives//html/Amps/2011-05/msg00243.html (10,438 bytes)
8. Re: [Amps] Henry 2KD-5 Problem (score: 1): Author: "k7fm" <k7fm@teleport.com>; Date: Thu, 26 May 2011 17:20:27 -0700; "The bias diode reads 13.5 K ohm in both directions when checked with one end of the 220 Ohm parallel resistor lifted," Ed, a normal dvm will check a single diode, but when you have diodes in series,; /archives//html/Amps/2011-05/msg00245.html (8,205 bytes)
9. Re: [Amps] Henry 2KD-5 Problem (score: 1): Author: "Jim Garland" <4cx250b@muohio.edu>; Date: Fri, 27 May 2011 14:22:32 -0600; I imagine this has already been mentioned, but with 3-500Z amps, a negative pinning grid current is often an indication of a grid-plate short, or a gassy tube. If there is a conduction path between t; /archives//html/Amps/2011-05/msg00252.html (7,909 bytes)

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