2. amps-preamps
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PrimaLuna tube amp issue

Aloha,

I just received by mail a used PrimaLuna Dialogue Premium HO Integrated amp. I hooked it up and it sounded great but after about 45 minutes of listening, the right channel disappeared after a quiet pop.  I have swapped out speaker wires, cables...no effect. No bad tube lights come on. Left channel plays fine. Headphone only has left channel as well. It was running a little hot, but not excessively so. Any thoughts...

 

Bummer way to start with a new/used piece of equipment....sigh.

 

Thanks for your help in advance.

Michael 

sparkymaui
sparkymaui OP
13 posts
 

hi, yes, I swapped all tubes from right to left channel. No impact. But,before I swapped I noticed a very faint amount of sound from left speaker at higher volume. Basically, still at square 1....

 

thanks, 

Michael

jasonbourne52's avatar
jasonbourne52
2,863 posts
 

Ah, the joys of ownership of tube gear with high internal voltages! I assume that the main circuit fuse isn't blown as you still have a working channel. Unplug the amp and let sit overnight. Then remove the bottom cover and take a look inside. Look for a blown cap with stuff coming out of one end. Could be a blown coupling cap. If so replacing it may not solve the problem! I wish all tube gear manufacturers would provide schematics to make troubleshooting easier! 

jasonbourne52's avatar
jasonbourne52
2,863 posts
 

Look also for burnt resistors on the circuit board. 

femoore12's avatar
femoore12
683 posts
 

I would reach out to Upscale Audio for support. 

holmz's avatar
holmz
2,328 posts
 

Maybe swap the LHS with the RHS speaker wires.
If the bad channel moves then swap the interconnects LHS with RHS.

If the bad channel stays put, then it is you speaker.

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