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

sales@qtron.se

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. 

Gain  

                                   

Channel balance

     

Input-impedance

                                       

Output-impedance                                      

 

Harmonic  distortion, (THD)           

 

Frequency response

                                

Hum and noise                                   

 

Volume control                                    

 

Mains voltage                                      

Power consumption                             

 

Dimensions                                     

 

Input connectors       PRE12

                                         

                                     PRE12B

 

 

Output connectors    PRE12                           

 

                                      PRE12B

 

 

Mains connector

 

 

Remote control function

 

Tube complement        PRE12

                                        PRE12B

 

Weight

-1dB, (0.85 times)

 

+- 0.05dB

 

40kohm

 

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

 

 11.5kg