The end of all questions - modern tube magic from Korea
 
The Waversa WVpower MK2 with 300B equipment is the ultimate balance of tube amplification. Their seamlessly constructed aluminum chassis without visible screws are subtle and elegant yet functional giving them great rigidity rendering the signal-carrying circuits insensitive to harmful vibrations.  This amp design incorporates a full balanced inter-stage with 6H30Pi tube with Lundahl inter-stage transformer which allows for zero feedback and eliminates one gain stage tube ensuring the purist signal amplification without distortion.  An LCD screen shows the current status of the output tube, driver tube (6H30Pi) and the current setting of the output tube in real-time. Of course, the WVpower MK2 has truly symmetrical and unbalanced inputs.
 
Both the WVpre and WVPower 300b monoblocks utilize fully ballanced internal circuityr and therefore balanced interconnests are recommended.  When paired together, their true potential becomes apparent.
 
Technology for good sound
Manual adjustment of the tube bias and real-time measurement of the tube current on the screen
Automatic detection of tube faults
No coupling capacitor and no feedback used
Fully symmetrical intermediate stage with 6H30Pi tube with Lundahl intermediate stage transformer
Fully balanced output stage with 300B tube with Lundahl output transformer
1x balanced inputs, 1x unbalanced input 
 
Technical specifications
Output power: 2x 20W
Dimensions (W x H x D): 440 x 105 x 330mm
Weight: 15kg