Q-tron Audio PA34B 80W OTL mono power amplifier

The A34B is a monoblock amplifier with an output of 80W and has a circuit design based on PA12, but has been improved so that four output tubes can be driven. With twice the current drive capacity of the PA12, the PA 34 also supports less efficient speakers.

Q-tron's Output Transformer Less (OTL) amplifier provides a clearer and wider sound quality compared to other vacuum tube amplifiers. By eliminating the output transformer required by a normal vacuum tube amplifier, it avoids the distortion and frequency characteristics limitations caused by the transformer and improves sound transparency and response. The Futterman circuit, designed specifically for low impedance without the use of transformers, achieves low output impedance and excellent balance. In addition, active noise cancelling technology to reduce noise below 100dBA and design to achieve very low distortion without excessive feedback. The use of minimal vacuum tubes has proven reliable and long life. All parts are designed and manufactured in Sweden and use high quality components to maintain high performance over a long period of time.

Most amplifiers are built on large PCBs, but for critical components, point to point (PtP) technology is used. Also, ceramic solder support withstand 5 kV is used, and the chassis- Made of 10mm thick aluminum, it provides excellent mechanical stability and completely eliminates noise caused by vibration.