Consonance Ref 5.5 MKII SET Integrated 300B Tube Amplifier

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MSRP: $3,500.00
Your Savings: $1,250.00 (35.71%)
Eligible for FREE Shipping



FACTORY DROP SHIPPING - for ordering brand new units: 


This model is only available by Consonance factory drop shipping to buyer's address. We do not stock it in Canada but buyer can enjoy WHOLESALE savings on drop air shipping to your door. From order placed to shipping time, it usually needs 10 business days lead time for custom transformer production for 115V at factory then ship by air with transit time 6-9 business days. 



All amps are thoroughly tested before shipping and Consonance factory one year parts warranty (not including tubes which is 90 days warranty) in place for original owner. No labor warranty in North America included in the drop shipping price. Schematics will be provided to buyer for future service with your own choice of tube amp repair technician. 


Never had a 300B amp but always wonder what the rave about SET amp is about? This is a perfect amp for you to experience great sound at a whole new level... unlike typical SET 300B amp which only delivers 9 watts per channel, this one doubles up the power to 18watts and still offer you the SET circuitry magic, and you can match wider range of modest sensitivity speakers.


If you have a Martin Logan electrostatic speakers with powered sub, this amp will deliver the magic that you have never heard compared to using a solid state amp, even a brand new good quality one... Your speakers deserve to be heard with the right amplifier for its true magic..


This 300B amp has pushed the potential of the tubes to the limit. Single ended triode (SET) circuit design has been sought after by audiophiles since the beginning of Hi-Fi and has its own unique following cult worldwide. Now this amp will double the power of a SET by using 300B tubes in parallel. The performance amazes every customer who has purchased in the past... beautiful finish and beautiful sound. 

You have a wide range of 300B vacuum tubes on the market from different manufacturers, at different price points to experience a whole array of tube sound magic. 

This amp also has a direct input - allowing you the flexibility to use it as a power amp to pair up with your own high end preamplifier. 



  • No global feedback high end design
  • 12AT7 as pre-amp tube, 12BH7 as driver tubes for 300B
  • (4) 300B tubes - each has its own bias setting monitored by front meter
  • High quality parts throughout 


  • Output Impedance: 8 ohm or 4 ohm
  • Output Power: 18 wpc x 2, (RMS, 1kHz)
  • Frequency Response: 7Hz - 47kHz, -3dB (5w)
  • THD: <1% (10w, 1kHz)
  • S/N Ratio: 80 dB
  • Input Sensitivity: 160mV 
  • Input: 4 pairs of RCA as integrated; 1 pair of RCA as power amp
  • Power Consumption: 182W 
  • Tubes: (4) x 300B, (2) x 12BH7, (1) 12AT7
  • Size: 18.5" D x 14" W x 9" H
  • Weight: 30kg / 66 lbs
  • color: top panel is black aluminum. 




Customer Reviews

Reviewed by Joseph R, 12/03/2014

I've been using this amp now for over a month and all i can say is's like i am listening to someone singing in front of me. Soundstage is awesome kinda like in a concert hall and separation of instruments are very detailed. I haven't even broken in this amp and it already sounds good after about 50 hrs of use.

Reviewed by David G, 04/20/2014

Feeback received via email:"The ref 5.5mkII sounds
FANTASTIC,now I got to experiment with all my audio equipment , to much to
list but right now I have it hooked up to Bluesound node ,Nad D1050 ,Mac
Mini, Grace Radio and Jamo E855 ....By the
way I find myself hearing things and looking around to see where it's
coming from . Do you think it's ghosts or am I going crazy (haha)? Can't
wait after break in".