2. amps-preamps
  3. 1172860352

Preamp Eats tubes..

I own a sonic Frontiers line-3 preamp.The unit eats up NOS tubes.I tried Brimare and matsushita's both within 2 or 3 months the tubes started going microphonic on me.I put in the origanal Sovtek tubes and they work fine.Why does this happen with older style tubes?Are the sovtek tubes built for a tougher demand?
spaz

Showing 2 responses by marakanetz

marakanetz's avatar
marakanetz
5,473 posts
 
you should inspect this preamp for proper steady voltages and currents.
you can get this information or detailed schematics from partsconnexion.com as well as great technical help from chris. or you have to have it done by a qualified technician.
marakanetz's avatar
marakanetz
5,473 posts
 
Raquel,

on quite a few preamps the preamp tube are peak-driven like a power tubes and so the life of them will shorten significantly when left on 24/7.

in power amplifiers the bypass electrolytic caps can wear out faster than tubes turned on 24/7 thus resulting very often overbias and dead tube thereafter.
More to discover