I have completed my experiment cooling 2 x GI-7BT tubes in a new 6 meter
amplifier this morning...
Final result is two 3.5 inch 240 volt muffin fans on the bottom cover
blowing directly on to the filament cathodes then exiting through the
sockets and chimneys...I added a 5 inch 240 volt muffin fan on the top
cover drawing the air up away from the tube anodes....Result is a good
air flow sufficient to keep the tubes fairly cool under operation....The
fans are reasonably quiet so I see no problems cooling the tubes this way...
The main thing is to have the bottom fans offset so that a direct air
flow is blowing on to the cathode filaments and making certain that
there is as little restriction of the flow through the sockets as
possible...The addition of another muffin fan on top makes sure that the
hot air is drawn out of the cabinet...I am quite pleased with the result....
Bob..VK3ZL..
_______________________________________________
Amps mailing list
Amps@contesting.com
http://lists.contesting.com/mailman/listinfo/amps
|