On 2014-01-27, at 11:07 AM, Andrew Kopke wrote: > What is a proven 6au6 substitute that I could possibly use in the vfo of a dx-100b ? Many thanks, Andrew Kopke Hi Andrew, In a word, 6AH6. In fact, an ARRL tech advisor once recommended that I replace the 6AU6 VFO tube in my Ranger with a 6AH6, way back when... ~73~ de Eddy VE3CUI - VE3XZ