2. amps-preamps
  3. 136993-96706

When it sounds like a tube amp needs rejuvenating,

how can you determine whether the power tubes or the output tubes need to be replaced ?  Or both ?   

 My amp is the VAC Phi 300 running 4 Psvane CV-181's up front and two quads of Shuguang Black Treasure KT-88's behind them.  

Thanks -
-john 
dr-john

Showing 1 response by freediver

freediver
1,261 posts
 
Power & output tubes going bad tend to snap crackle & pop,literally...
Small signal tubes going bad are sneaky,usually only displaying lack of volume until going dark...JME,YMMV...
PS:Figure around 5000 hours for small signal & between 2000 & 3500 for power/output depending on bias...
More to discover