Am surprised no one mentioned that the D104 was made with two types of elements, crystal, believe they were Rochelle salts or something like that and ceramic. If I remember correctly the ceramic was the D104C, had lower output and could withstand heat and rougher handling. I copied Tom's J310 post and drew a diagram, it looks good and the values check with the J310 specs. Time to get the old D104C back in service. 73's Bob,w5pvr
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