PA12B 2x25W

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

PA12 is an OTL amplifier that is equipped with 2 6C33C tubes per channel that is driven by the unique driver circuit to 25W output power. Even at 10W output power the distortion is less than 0.1%, a very good figure for a tube amplifier, at 1W distortion is as low as 0.01%. Hum and noise reach very low values as active noise reduction is used.

PA12 is the amplifier that was reviewed by Dick Olsher in Enjoy The Music ("Q-tron PA-12 beats them all") and was described as "A tube amplifier that redefines what is possible in a push-pull design.

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.


Output power 25W in 8 ohm at less than 1% distortion
20W in 4 ohm at less than 1% distortion
Distortion at 1kHz (1W) < 0.01%
Distortion at 1kHz (10W) < 0.1%
Frequency response 5 - 100kHz - 1dB
Effektbandbredd 10 - 100kHz - 1dB
Rise time < 0.5us
Hum and noise < -100dBA
Output impedance 0.4ohm or 1.5ohm, (see text above)
Input sensitivity 2.5 V for full output power
Input connectors RCA phono + XLR
Dimensions 430 x 250 x 290 mm, (W x H x D)
Weight 21kg