I usually do a quick check of crystal current when trying out new circuits or older military equipment. The modified holder has a 40 mA bulb and my personal cut off for current is around 20 mA or about half brilliance.  The older FT-243 and larger crystals seem to handle that much current without incident. However the newer imported crystals that are much smaller might be a problem.  Rot of Ruck!     
see attch
k4che


On 8/6/2024 8:31 PM, Hubert Miller wrote:
Re single tube 813 transmitter:


A good friend of mine built and operated one of those. Walt Polete near Missoula,Montana. He loved it.

150 watts input.  Crystal controlled. I have the original RCA-published article on my web site as a PDF.
Another ham built one of those recently and operates it, mostly on 40. It sounds good too.

Ken W7EKB

It doesn't eat crystals? 
-Hue,  K7HUE 
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