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, 2011 6:42 PM
Subject: Re: [Amps] Henry 2KD-5 Problem
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
--------------------------------------------------
From: "Mitch Cox" <ww4cox@embarqmail.com>
Sent: Thursday, May 26, 2011 3:32 PM
To: "ED MCKIE" <kb5gt@cableone.net>; <amps@contesting.com>
Subject: Re: [Amps] Henry 2KD-5 Problem
> You have a shorted tube.
> ----- Original Message -----
> From: ED MCKIE
> To: amps@contesting.com
> Sent: Thursday, May 26, 2011 6:18 PM
> Subject: [Amps] Henry 2KD-5 Problem
>
>
> 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 negative direction as
> soon
> as it is turned on, and stays there even with drive applied. It also has
> plate current flowing ( about 300 mA ) even when not keyed. It is still
> working and has output.
> I have to get someone to move it to my workbench due to a back injury,
> so
> all I've done so far is to remove the top. The bias diode reads 13.5 Kohm
> in
> both directions when checked with one end of the 220 Ohm parallel
> resistor
> lifted, but I see nothing that made the loud pop, so far.
> When I get it on the bench I can get into it, but wondered if anyone
> else
> had seen these problems in this or a similar amplifier.
> Thanks & 73,
> Ed, KB5GT
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