My tube reference book is slightly lacking, can anyone tell me the filament voltage and current per tube of the 3CX800 thanks in advance. Kurt K3KL... -- FAQ on WWW: http://www.contesting.com/ampsfaq.html Submissions: amps@contesting.com Administrative requests: amps-REQUEST@contesting.com Problems: owner-amps@contesting.com Search: http://www.contesting.com/km9p/search.htm