On a webpage somewhere, I cant remember now where, I read about the GU-84B (4CX1600) having an undersized radiator. I think it was on a Russian amateur website. What I had read was this tube was actually designed for running in a missle by the Russians, and was designed for a 1 time use. So, they undersized the radiator a good bit because of space limitations. They were making the comparison to a 4CX1500's radiator size being larger in the discussion. However the guts of the GU-84B supposed to be really good. So this brings the delima of how to cool it so one would get a long life out of it. One way would be add some sort of extra aluminum heat fins, or some made of brass, with fins sticking out to catch more air, thus increasing the overall surface area. The only other way would be to increase the amount of air flow and volume over the fins that's there. When doing this though, the noise goes up from the blower. However, if one is going to dealve into using the GU-84B, I'd suggest looking into this and compare the sizes between its radiator and the one for the 4CX1500. Even though the tube is cheaper than some others, it's still expensive if you have to re-tube all the time. If I can remember where I seen this, I'll post the link.

Best,

Will

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