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Primaluna 300 integrated running 6L6 with high bias switch

I have a Primaluna EVO 300 integrated.  I prefer the sound of 6L6 with the high bias setting.  The low end is more firm and lively.  
 

Primaluna says plate voltages run at 417v, I’m assuming that’s the low bias setting.   Anyone know how much the high bias switch increases the plate voltage?  Supposed to use the high bias setting for 6550, KT88, KT120.

I

randybrinkman

Showing 2 responses by randybrinkman

randybrinkman OP
14 posts
 

I really like the primaluna presentation. The detail and warmth are great, but the bass is a little soft.  It’s not lack of bass, but the bass is a little mushy compared to my Audio Research VSI 60.  
 

The VSI 60 has hard hitting solid bass with a colder overall presentation.  I’m afraid to run this amp very often.  It tends to go out and take the tubes with it every couple of years.  I’ve had it maybe 10 years, and always rotate my amps so it’s not running all the time.  In that time, I’m on my 3rd set of KT120s, plus it has to be repaired every time.  That’s a lifetime of power tubes in the primaluna.  

I’d like to keep the primaluna’s mids and highs, but have firmer bass.  
 

 

randybrinkman OP
14 posts
 

I haven’t tried them yet, but I’m sure I eventually will.  I tend to rotate the power tubes on a regular basis.  One of my favorite combos are JJ 6CA7 in the outside slots and Siemens EL34 on the inside.  Just the stock tubes inside with the 6CA7 on the outside are pretty awesome.  Really helps with the bass.

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