That series of amps went thru several fan models and finally settled on a
German made metal one. The heat would warp the plastic ones causing them to
slow down.
The metal fan in my LK-500ZC was installed in 1989 and has been fine even
under full blown contest use since then.
The fan issue has no bearing on the bandswitch which is due to either bad
parasitic resistors or contact misalignment.
A new fan can be purchased thru Grainger and other suppliers.
Carl
KM1H
----- Original Message -----
From: "dave arruzza" <w1ctn@yahoo.com>
To: <amps@contesting.com>
Sent: Monday, August 13, 2007 11:44 AM
Subject: [Amps] LK 500 ZA heat
Hello to all.
My LK 500 ZA gets very hot when operated for any length of time. I do not
think that the stock fan is adequate for the job. I am planning on adding at
least one fan externally to pull out some of the hot air from the 3-500Z's.
Has anyone else had this problem? With the amount of heat generated I am
sure that some other components inside that box are stressed from the
extreme heat. I just want to alleviate this condition before other parts
start to fail.
I'm sure that the bandswitch problems associated with this linear are a
direct result of the heat retained within the box.
Any ideas and mods are welcome.
73
Dave W1CTN
---------------------------------
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