2. amps-preamps
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Do tubes need break in / burn in?

I've bought a set of NOS JAN Philips 5751 tubes to replace JJ 12AX7 in my preamp. After the change, the sound has become worse. The soundstage depth is flat, and just less involving overall. Do the tubes need break in, and if so how long do I need to burn them in?
jylee

Showing 1 response by hifitime

hifitime
715 posts
 
I agree with Cyclonicman.It's a different tube.Conrad Johnson
uses 5751's in some of their amp's,but they're designed for
for it.If your amp calls for a 5751,its a different story.Your
VTL 5.5 calls for 12ax7's I think.It should deserve some good
NOS 12ax7's though.I've had noisy JJ's that didn't get along
with some preamps too.Someone suggested RCA's.Bugle Boy's
sound nice at times too.
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