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Re: [Amps] LK 500 ZA heat

To: "dave arruzza" <>, <>
Subject: Re: [Amps] LK 500 ZA heat
From: "jeremy-ca" <>
Date: Mon, 13 Aug 2007 12:23:58 -0400
List-post: <>
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.


----- Original Message ----- 
From: "dave arruzza" <>
To: <>
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.

  Dave W1CTN

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