2. amps-preamps
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Lower power on left channel

Hi all, 

Does anyone have any ideas or come across this before?

I have a Primaluna Evo 300 pre-amp with a Primaluna Evo 400 power amp, using G/L KT 88 tubes. The other evening I was sat there playing some music and suddenly thought that it did not sound right, as I stood up and walked towards the centre of my speakers I noticed the the left speaker was down on volume compared to the right speaker. As I went to turn the system off I noticed that the KT88 tubes where down on heat to what they normally are.

I can not do much now till after Christmas but any help would be much appreciated

Merry Christmas 

Steve.       

128x128bigred71
immatthewj
2,043 posts
 

Good plan.  If it doesn't follow the speaker cables, I guess it's the speakers.  If it does follow the speaker cables, try swapping pre to amp interconnects, and if it follows them I guess it's in the preamp, and if it doesn't, I guess it's in the amp.

Good luck.

jond's avatar
jond
5,845 posts
 

It's almost certainly a tube or tube going bad you have some good advice above.

vicdior
40 posts
 

I had that problem a few weeks ago and it was the right channel with my pre amp that was causing the problem so I replaced it and all is good as new.

blackbag20
468 posts
 

Good luck, OP!

 

vetsc5
26 posts
 

Seasons greetings to you Bigred,

just a quick fyi that Prima Luna amps are equipped with a “BTI”  (bad tube indicator).  It’s an LED that will glow red located in front of each power tube.  If no red LED glow your tubes are good to go. 
 

Enjoy the music. 

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