[Central-Electronics] RE: 600L problems

[George Maier]

Hi Lynn:

I had a discussion some years ago with an ex CE employee that worked on the
design of the 600L.  Relative to load mismatch circuit, I learned that the
most frequent cause of problems relates to the 1N34's in the RF bridge.
Germanium diodes do not age very well, and have a tendency to go south
suddenly.  

Good luck & 73,

George - W1LSB


-----Original Message-----
From: central-electronics-bounces at mailman.qth.net
[mailto:central-electronics-bounces at mailman.qth.net] On Behalf Of Lynn Fisk
& Georgia Keysor
Sent: Thursday, August 14, 2008 10:11 AM
To: central-electronics at mailman.qth.net
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.
_______________________________________________
Central-Electronics mailing list
Central-Electronics at mailman.qth.net
http://mailman.qth.net/mailman/listinfo/central-electronics