[AMRadio] GK500B blower

[Rob Atkinson]

okay Jim thanks.   So it cools resistors and tube pins.  I was puzzled
partly because I did not see the tube in a chimney.  I'd use higher
watt resistors.

73

Rob
K5UJ

On Sun, Jan 1, 2012 at 10:01 PM, Jim Wilhite <w5jo at brightok.net> wrote:
> The squirrel cage outlet is pointed down into a hole about 1 sq. in.  There is a plate covering the bottom of the chassis.  As far as I am concerned air flow is barely adequate evidenced by a 50 k ohm resistor that will show heat marks.
>
> Also the 6 k dropping resistor for the lower stages may change even though it is wire wound.  I found a small 120 V muffin fan that I mounted near the hole to direct air toward the tube base to assist cooling of the bias resistors and tube base pins.
>
> One should be sure the base cover seals well.  I have never seen a 500 with all the screws still in the cover plate.
>
> Jim/W5JO
>
> Rob Atkinson <ranchorobbo at gmail.com> wrote:
>
>>I looked at the photos and it is not clear to me what the blower is
>>supposed to cool.
>>It looks like it pressurizes the chassis?
>>
>>Rob
>>K5UJ
>>
>>
>>On Sun, Jan 1, 2012 at 6:49 PM, Dan Osborne <wb5afy at wb5afy.net> wrote:
>>> OK guys - follow this link to W0YVA's web site for pics of the RF
>>> deck with the blower -
>>> http://www.isquare.com/personal_pages/globeking500-rfdeck.htm
>>>
>>> looks to me like the output of the squirrel cage is about 1 inch square..
>>>
>>> and - yes - my backup plan is to use a muffin fan mounted on top of
>>> the RF deck !!
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