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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
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.

Ag insider logo xs@2x
oldhvymec
5,101 posts
 

All tubes including signal tubes? or Just the power tubes?

Are the valves lighting up? If they are not lighting up, that's one thing. If they are I'd be looking to the small valves.

Speaker wire swap to check for speakers.

RCA/XLR swap to check for cables and source.

Not a fuse in the speaker?

Not a fuse per channel?

Side Note: It was shipped to your Island.
Tubes 101 IF the valve survives transportation, it should be checked, WHY? That is when they WILL fail, most often after being shipped. Small valves???

Just thinkin' out loud.

Happy hunting

sns
3,003 posts
 

Yep, tube failure just after shipping, not unusual, and can happen with all tubes and equipment! This actually happened to my PL Dialogue Four, one EL34 power tube failed on first firing, took out one resistor on auto bias board, I did diy repair.

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