[Central-Electronics] Re: Central-Electronics Digest, Vol 54, Issue 2

[Jim Candela]

Lynn,

    I was just looking at that schematic in digital form, and the image is 
somewhat smeared and in two pieces. Kind of hard to follow. As for 
troubleshooting, I might start by removing the plate caps from the 816 
rectifier tubes and see if the problem goes away. Maybe you got one bad 
Mercury Vapor tube, or there is leakage to ground somewhere. I suppose it 
should power up OK without a fault using a single 816. I would not drive it 
with RF however. Does yours still have the selenium rectifier in there for 
the relay DC?

    You are welcome to come get my 600L and burn the cob-webs out of mine. 
Consider it a loaner until yours is fixed.

Regards,
Jim
WD5JKO
----- Original Message ----- 
From: "Lynn Fisk & Georgia Keysor" <k5lyn at earthlink.net>
To: <central-electronics at mailman.qth.net>
Sent: Thursday, August 14, 2008 9:10 AM
Subject: [Central-Electronics] Re: Central-Electronics Digest, Vol 54,Issue 
2


> Greetings to the group, and thanks Nick for your information on the 
> switch.
>
> I can use some advice.  The 600L that I have had on the air for about 3 
> years now (thanks to some help from K5EF) has suddenly developed a 
> problem.  I can turn the Filament switch on with no problem.  But about 
> one second after I turn on the Plate switch, a relay throws and the Load 
> Mismatch light comes on.  I can make it go off by pushing the Plate 
> Overload button but the light is on again as soon as I let go of the 
> button.
>
> I think I caused this.  The other day, I failed to notice that I had left 
> the plate switch on when I turned on the filament switch.  I have had this 
> problem ever since and the amp is off the air.
>
> I assume I will be pulling the front panel (again, as I did when I first 
> put the amp on the air).
>
> Do yall have any advice as to what I should be looking for?
>
> Thanks, Lynn, K5LYN.
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