2. amps-preamps
  3. 1253223387

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 thorman

thorman
1,262 posts
 
Some equipment just do not respond well to 5751 tubes..It may well only be that case...Try a pair of Amperex Bugle Boys or Phillips Miniwatt 12ax7 tubes and you should be very happy.I have tried a few 5751 myself and always come back 12ax7's...Amperex,Phillips Miniwatt or Tungsram...
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