[Amps] FAN SPEED

[Carl]

In the LK-500's an EBM Papst 4600X fan will move more air at less noise.
A Hi-Low thermostat was available from Amp Supply and then Omega 
Electronics. Both are now gone.

Carl
KM1H




----- Original Message ----- 
From: "Edwin Karl" <edk0kl at centurytel.net>
To: <amps at contesting.com>
Sent: Thursday, November 07, 2013 12:57 AM
Subject: [Amps] FAN SPEED


>I have 2 LK-500 amps, Amp Supply paralleled 2- 10 or 20 watt resistors for
> slow speed, shorting them when on high speed.
>
> I added 2 thermostats and an additional resistor. Works like this. Normal 
> low speed
> as original. At 125F. I use a thermostat to add additional resistor to 
> bundle, slightly
> speeding the fan. At 160 F. An additional thermostat shorts the whole 
> thing, fan goes
> full blast.
>
> Even in RTTY contest I rarely hear the high speed kick in, and that for 
> relatively short
> period of time. The fan blows air across the tubes, exiting on the right 
> side of the
> cabinet. Stats are mounted about 3 inches off chassis and in the exhaust 
> path just
> as the air exits the amp.
>
> Been working for about 7 years now, no problems, and I don't worry about 
> forgetting
> to flip the switch ...
>
> 73
>
> ed K0KL
>
>
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