>
>Recently, thinking to help keep my SB-220 cool under contest conditions, I
>added a small 110v muffin fan pulling air from the top front of the tube
>compartment -- my thought was to enhance the overall flow of cooling air.
>The added fan is just sitting on top of the cabinet near the front edge,
>and subjective the cabinet does seem to be staying a bit cooler.
>
// This arrangement should work since warm air exhausts on the left side
of the cabinet and through the top of the cabinet. For optimal cooling,
the SB-220 should have breathing room on the left, the top, and the rear
of the cabinet - plus the fan motor bearings need to be oiled
periodically. However, a cooling fan in good working order will keep
things cool enough - unless max-berserko speech processing is used.
>Tonight, when I turned on the amplifier, I see only one filament lighting.
>My immediate thought is that I have melted the solder in the filament pins
>on that side from excessive heat. Is it plausible that the "helper" fan
>could have upset the normal flow sufficiently to have caused this? Or is
>it likely just a coincidence?
// One filament not lit is often caused either by solder melting out of
pin 1 or 5, or it is caused by not enough spring tension on the
corresponding socket pins - due to heat-caused loss of temper in the
spring. Either condition is typically caused by not oiling the fan
and/or interfering with the natural flow of cooling air.
>
good luck, Pete
- R. L. Measures, 805.386.3734, AG6K, www.vcnet.com/measures.
end
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