[Amps] commercial amplifier cooling

[Gary Smith]

My guess woudl be the fan on the L-4 are 110 V given the age of the amp 
along with the technology of the time at its manufacture.
Look on boat anchor manual archives,(bama) you might be able to find a 
schematic for it there noting the power requirements of the fan motor.
Bama link is below
Gary...wa6fgi


http://bama.sbc.edu/


----- Original Message ----- 
From: "schuetzen" <chasm at texas.net>
To: "Pete Smith" <n4zr at contesting.com>; "Amps Amps" <amps at contesting.com>
Sent: Thursday, February 14, 2008 9:02 AM
Subject: Re: [Amps] commercial amplifier cooling


> Pete Smith wrote:
>> I don't know offhand what the L4 uses as its cooling blower, but my 
>> SB-220
>> has a large fan (rather than a squirrel-cage blower) that is mounted in 
>> the
>> back of the cabinet and blows directly on the tubes.  What I did was to
>> place a small "muffin fan" - like the ones in computer power supplies -
>> directly above the tubes on the upper cabinet.  It operates as you 
>> suggest,
>> sucking air from the area around the tubes, and I have found it 
>> definitely
>> helps keep the tubes cool.
>>
>> 73, Pete N4ZR
>>
>
> good idea Pete, what do you power it with??  I have about 15 fans of
> all sizes but they ran off the tower's three color wire leads from the
> PS.  have no idea what the VAC was they were running on. maybe about 5v?
>
> so, your idea has me very curious on a couple of different aspects.  I
> really believe that like all things with filaments in them, the cooler
> you can keep them, the longer they will last.  I doubt that they would
> like zero degrees F. but... certainly keeping them at or close to room
> temp would not be bad if it could be done.<G>
>
> thanks
> chas, K5DAM
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