Matching pre amp tubes?


Hello, I was wondering if it was nessasary to match the 6DJ8's in my pre. I see lots of matched output tubes but as yet have not seen anyone selling matched tubes for pre amps. Is it not as critical as with the output? Thanks, Gene
geeeno

Showing 1 response by spokanais

You don't have to match the tubes in the preamp section because they're bias in class A operation not class AB or class B as in the ouput push pull stage. The matching of the ouput stage tubes help reduce the distortions create by the difference in cathode current from one tube to another.