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PA3B, (balanced and unbalanced input)

Front PA3B

Backside PA3B

2 x 8W OTL power amplifier

 

10 times lower distortion than other OTL amplifier thanks to unique driver circuit. 

 

PA3B is an OTL amplifier that is is equipped with 2 6C41C tubes per channel that is driven by the unique driver stage to 8W output power, at 0.5W distortion is as low as 0.01%. Hum and noise have very low values as active noise reduction is used. 

 

PA3 is a low power version of PA12 which is the amplifier that was reviewed by Dick Olsher in Enjoy The Music and was described as "A tube amplifier that redefines what is possible in a push-pull design."Q-tron PA-12 beats them all" see review here:

 

http://www.enjoythemusic.com/superioraudio/equipment/0212/q_tron_pa_12_otl_amplifier.htm

 

The amplifier is built on a large PCB except for critical parts that are built using so called Point to Point, (PtP) technology, ceramic solder supports are used that can withstand 5kV.  The chassis is made of 10mm aluminium which gives extraordinary mechanical stability and completely remove vibration induced noise. 

Performance:

 

Output power                                   

                                              

 

Distortion at 0.5W                  

                

 

Frequency response                

Power bandwidth                   

 

Rise time

                                   

Hum and noise                        

 

Output impedance

 

Input connectors        

 

Dimensions                           

 

Weight                                       

 

8W in 8 ohm                                 

5W in 4 ohm                                              

 

<0.01 %               

         

 

5 - 150kHz                

10 - 100kHz                  

 

0.5us

                                   

< -100dBA                      

 

1 ohm

 

RCA phono + XLR         

 

430 x 240 x 290 mm, (B x H x D)                       

 

21kg