Product image
SKU: TSA-300
Category: Power Amplifier


TSA-300 Stereo Power Amplifier, based on SSA-350 Mono Blocks is a hybrid design, designed to deliver exceptional sound to difficult loads. Using both tube and solid state circuits, combines virtues of both technologies to achieve the end result. 

Dual Mono Design with 2 completely separate hybrid amplifiers in one chassis.  

Each of these amplifiers has 2 separate Linear Power supplies. 4 power supplies in total.

The first power supply is using a custom-designed EI, low loss lamination transformer, and a custom-designed choke. It supplies the High Voltage and the Heater Voltage required for the 12AU7 tube front stage.   

The second power supply is using a unique custom-designed UI, low loss lamination transformer. Combined with high-speed rectification and quality filter capacitors delivers dual polarity voltage and high current needed for the solid-state and output sections. 

The audio signal is connected directly to a 12AU7 Tube front stage supplied by its dedicated power supply.

Ultra linear solid-state circuitry takes over further amplification of the signal and delivers the signal to current amplifier circuit that delivers the power to the load. Only bipolar transistors are used in the circuit. Semiconductors, as well as resistors and capacitors, are closely matched.

There is only one high-quality film capacitor in the signal path from input to output.

A Mosfet protection circuit is used to connect the load to the amplifier. After power up the protection circuit will wait approx 13 sec before connecting the amp to the speaker, giving time to the tube heaters to warm up. 

DC fault protection and high temp protection.

High-quality PCBs. All boards are hand assembled. All parts of the amplifier are hand wired.   

Highest quality components are used throughout the circuit. Each component is handpicked, tested, and matched to serve the design.

Technical Information

  • Maximum Voltage Input: 1.5 Vrms

  • Output Power: 300W RMS @ 4Ohm, 150W RMS @ 8Ohm

  • Input Impedance: 100K 

  • Gain: 27 dB

  • Frequency Bandwidth:  300KHz 

  • Tubes used: 

    • 2 X 12AU7

  • Voltage Options (Factory Set):  

    • 230-240VAC

    • 110-120VAC

  • Fuses (5x20mm): 

    • 2 X T3.15A (Slow Blow): 220V-240 VAC

    • 2 X T6.3A   (Slow Blow): 110-120 VAC

  • Color Options (Front Plate):

    • Silver

    • Black

  • Unit Dimensions (W x H x D):  500 X 252 (with feet) X 520 mm

  • Unit Weight:  55 Kg

  • Shipping Dimensions (W x H x D): 610 X 300 X 620mm

  • Shipping Weight:  65 Kg


PDF document

TSA-300 User's Manual

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