Paul...
That was I that was requesting the info about the neagtive grid current on the
LK-500
I just got done working on mine. I found last week that the grid shunt
resistor was blown and someone on the list here suggested that it may be
exactly that and it was!
I ordered a few from digikey and replaced it.....it is now running once again!
This amp was a new addition/project for me and I'm glad to finally see
something come out of it.
Dave
KB8NNU
________________________________
From: Paul Decker <kg7hf@comcast.net>
To: amps@contesting.com
Sent: Wednesday, September 9, 2009 2:36:50 PM
Subject: [Amps] LK500-ZB
I saw a thread about LK500 and negative grid current. Was that ever solved?
My LK500-ZB is acting up. OK, I think it is my fault, the amp was on, but in
standby and I was in the shack hanging a picture and dropped the hammer ontop
of the amp (cover on and all)
No visible damage to the case, but now when the amp is turned on, but in
standby, the plate current reads about 200mA and the grid current is pegged
negative. Plate voltage is lower than what it used to be, about 2600 V.
Switching between RX/TX doesn't seem to have any affect, I can hear the relay
kick. One final observation, in RX, one tube starts to glow orange, while the
other stays the normal light yellow color.
It seems as if maybe somehow the tube is internally shorted or something.
Ideas, suggestions..
thanks,
Paul (KG7HF)
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