GS-15B with air cooler in place.

Although the anode cooler on this tube cannot be removed, The GS15B can be water cooled very efficiently with some simple modifications.

Click on pictures below for zoom

Anode Machining Mill 2 slots in the cooler, ¼” wide and ¼” deep. Fabricate a sleeve that fits over the fins. OD should be no more than the plate connector ring. Length can be about 2mm longer and then the top machined with a step to slip inside the cooling jacket and fit snuggly against the top of the tube cooler. A top made to fit wholly inside the sleeve against the tube cooler and flush with the end of the sleeve is just fine. Make a top plate with 2 holes to match available brass connectors. Line up the top plate with milled slots and push the brass connectors in place. Add rosin flux to all surfaces to solder. Heat the whole assembly gently with a propane torch until hot enough to melt solder. Solder all surfaces. Let cool slowly. The water will be forced around the cooling fins and provides very efficient cooling.

Description & pictures of a water cooling system.