[Amps] 3-500Z pin comes unsoldered

Tue May 13 22:05:29 EDT 2014

When the pins get hot enough to melt the solder, it means they are not getting enough air. make sure you have enough airflow to cool them. In amps with chimneys, the air comes from the bottom of the tube (henry, drake L-4, ect.). Some amps use a transverse cooling system (Amp Supply, Heathkit, ect.). Make sure all filters are clean, and if you are using AM or RTTY to make sure you reduce power. to fix a pin, I recommend a Torch, or a Weller D550 soldering gun. I also put a small piece of wire in the pin to help the solder anchor better. I hope this helps.

P.S. Some amps just have terrible cooling systems, and cooling the pins seems to have been forgotten. Take note if the pins are not directly cooled and try to fix if you can.
Steven Grant W4IIV
On Tuesday, May 13, 2014 4:01 PM, Larry <lknain at nc.rr.com> wrote:

I had a brand new Henry years ago that would melt the solder out of tube 
pins. I got rid of it.  I wondered later if perhaps the problem was too much 
RF etc running around in the box (e.g., bad bypass caps). The amp had a 
distinctive signal on 80M.

73, Larry  W6NWS

-----Original Message----- 
From: Gary Smith
Sent: Tuesday, May 13, 2014 1:33 PM
To: amps at contesting.com
Subject: [Amps] 3-500Z pin comes unsoldered

My dad's PT2500 has a problem where one of the 3-500 pins gets hot
enough it unsolders. I'm going to have a look at it & am thinking
maybe there's a poor connection on that pin/clip but maybe its
something relating to a defective component.

Before I open it up I'd appreciate suggestions on what to
specifically look for that might not be obvious to the eye, might
save me some time reinventing the wheel.

73,

Gary
KA1J

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