2. amps-preamps
  3. 192410-110112

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.       

bigred71

Showing 2 responses by immatthewj

immatthewj
2,771 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.

immatthewj
2,771 posts
 

+1 @2psyop  .  I don't know your preamp, but I have a Cary SLP 05 that uses 6SN7s, and using a specific test tone on a test CD I have used the AC volts setting on my meter to check volts at my speaker terminals, and I have found that depending upon which tubes I am using in my balanced input sockets, the readings are not always the same from L to R speaker.  I have found that when I then swap my L & R balanced input tubes, the readings I get follow the tubes.  

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