PRE12B buffer preamplifier (balanced inputs/output)

PRE12B backside

PRE12 front, (PRE12 och PRE14 has same front)

All tube buffer preamplifiers with low output impedance and very high transparency 
4 selectable inputs, relay switched volume control built with discrete resistors 

PRE12 has 4 RCA phono inputs and 2 RCA phono outputs

PRE12B is fully balanced and has 2 RCA phono inputs, 2 balanced XLR inputs, 1 RCA phono output och 1 balanced XLR output


NOTE! all amplifier stage are 100% tube and OTL, no solid state components nor transformers or chokes are used in the audio chain


Volume and input choice can be controlled by remote 


Advanced stabilised power supply, (anode och heater) give very low levels of hum and noise

The amplifier is built on 3 PCBs, the chassis is made of 10mm aluminium which gives extraordinary mechanical stability and completely remove vibration induced noise. 


PRE12 is a perfect fit with PA12 or PA34  OTL power amplifiers, the low distortion of PA12 and PA34 make it important to put high requirements of the preamplifier, PRE12 fulfills these goals and will not affect the crystal clear sound from PA12 or PA34. PRE12 is of course also a perfect choice in any other case where a very transparent preamplifier is desired.


We use a volume control built with discrete resistors in PRE14. We recognize that there are some good potentiometers available in the market but  a discrete resistor base volume control can give better performance than any potentiometer and is impossible to beat.  The volume control in PRE14 has 64 positions that are switched using relays with gold plated contacts, channel balance is within +-0.05dB at any volume setting. 



Channel balance






Harmonic  distortion, (THD)           


Frequency response


Hum and noise                                   


Volume control                                    


Mains voltage                                      

Power consumption                             




Input connectors       PRE12





Output connectors    PRE12                           





Mains connector



Remote control function


Tube complement        PRE12




-1dB, (0.85 times)


+- 0.05dB




300 ohm


<0.001% a 1kHz at 1V output


5 - 100kHz - 1dB


 <-100dBA at 1 V output


64 steps


230V ± 10%


100W max


430 x 370 x 110 mm,  (B x D x H) 


Gold plated phono 4 inputs


Gold plated phono 2 inputs, 

balanced XLR 2 inputs


Gold plated phono 2 outputs


Gold plated phono 1 output,

balanced XLR 1 output


IEC320 with integrated power switch and dual fuses



Volume level, input channel selection


2 6N6Pi

4 6N6Pi



© 2017 by Q-tron Audio. All rights reserved.