__________


 

Model: PCF-150 ==> 1.50" dia. power cooler

 

Fits the following types: 6550, 6L6, 5881, EL509/19, 6LF6, etc.


 

 

 

Working Clearances

 

 
 
 

Convective Cooling - Normal Operation

         
         
Equipment: Test rig   Power - Fil: 10.0 W
Serial No: N/A   Power - Anode: 50 W
Tube type: KT-90A   Power - Total: 60 W
Mfg. by: Ei - Yugoslavia   Cooler type: PCF-150 power
Bulb dia.: 1.50"   Cooler height: 2.62"
Bulb area:: 14.6 sq. in.   Cooler area: 102 sq. in.
         
Notes:        
While the picture above shows an EL-509, the original work was done using KT-90s at the time when we were consulting to VTL in the USA on the final revisions to the screen grid/anode spacing and dimensioning, a very important parameter in a beam tetrode.

 

Forced Air, Fan Cooling - Custom Operation

         
         
Equipment: Test rig   Power - Fil: 10 W
Serial No: N/A   Power - Anode: See notes
Tube type: KT-90A   Power - Total: See notes
Mfg. by: Ei - Yugoslavia   Cooler type: PCF-150 power
Bulb dia.: 1.50"   Cooler height: 2.62"
Bulb area:: 14.6 sq. in.   Cooler area: 102 sq. in.
         
Notes:        
The KT-90A is shown operating at two anode dissipations. The broken curves show bulb temperatures at 30W total dissipation while the solid curves show bulb temperatures at 60W total dissipation.
PEARL SC150 cooling system test rig. Air flow = 50 ft/min. through 2.5" ID clear acrylic plastic chimney.