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 vetsc5

vetsc5
58 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. 

vetsc5
58 posts
 

Addendum to my previous response-I have a non contact infrared laser pistol grip thermometer that has many uses.  Just added checking Amp tube temps to it's portfolio.  Got it at HF (20:1 ratio for less than $40 with coupon) originally to check header pipe temps on engines..  Very accurate on tubes also.

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