Trust what you hear, your perceptions are unique to you. .

TPA-280  Reference Series Tube Power Amplifier   2017 Upgraded Version!!!

50 watts x 2 (Triode), 100 watts x 2 (Ultra Linear), KT150 x 4 / 6SN7 x 2 / 6SL7 x 2 / GZ34 x 2  (All Matching DCT tubes) 

DCT Choke, DCT Pure Silver internal wiring for audio paths & Power Cord

MSRP:  $9,000 / set  


Power Output

Minimum sine wave continuous average power output per

channel, both channels operating is:

100 watts into a 4 ohm load or an 8 ohm load (ULTRA LINEAR mode)

50 watts into a 4 ohm load or an 8 ohm load (TRIODE mode)

Total Harmonic Distortion

Maximum Total Harmonic Distortion at any power level from 250 mill watts to rated power output is:

0.5% for a 4 or 8 ohm load

Frequency Response

+0, -3.0dB from 10Hz to 65,000Hz

+0, -0.5dB from 20Hz to 20,000Hz


High Level: 450mV for 2.5V rated output

Power Amplifier Input: 2.5V for rated output

A-Weighted Signal To Noise Ratio

High Level: 99dB below rated output

Power Amplifier: 120dB below rated output

InterModulation Distortion

Maximum InterModulation Distortion if instantaneous peak output does not exceed twice the rated output,

for any combination of frequencies from 20Hz to 20,000Hz is:

0.5% for a 4 or 8 ohm load 

Input Impedance

High: Level, 100K ohms

Maximum Input Signal

High Level: 9V

Voltage Gain

High Level to Main: 21dB

Wide Band Damping Factor

Greater than 50

Rated Power Band

20Hz to 20,000Hz

Power Requirements

100 Volts, 50/60Hz at 5.0 amps

110 Volts, 50/60Hz at 5.0 amps

120 Volts, 50/60Hz at 5.0 amps

220 Volts, 50/60Hz at 3.0 amps

230 Volts, 50/60Hz at 3.0 amps

240 Volts, 50/60Hz at 3.0 amps

Note: Refer to the rear panel of the TPA-280

for the correct voltage.

Preamplifier Tube Compliment

2 -6SL7   1st Stage Amplification Circuitry

2 -6SN7   High Level Circuitry

Power Amplifier Tube Compliment

4 - KT150

Power Regulation (Preamp Section)
2 - GZ34

Overall Dimensions

Width is 16-7/8 inches (43.0cm)

Height is 9-1/8 inches (23.0cm) including feet

Depth is 16-7/8 inches (43.0cm) including the Front Panel and Knobs


76 pounds (34.5kg) net, 81 pounds (36.5kg) in shipping carton


** Due to continuous product improvement, actual product might be varied from product's picture.