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Increcable - iAmp TPA-280 - Reference Series Tube Power Amplifier (Set)

Increcable - iAmp TPA-280 - Reference Series Tube Power Amplifier (Set)

The iAMP amplifier was designed to provide a significant value based on a high performance to price ratio that will exceed the sonic quality of good solid state amplifiers with its musical accuracy.

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

Deep Cryogenic Treatment DCT Tube

The process makes a permanent change and the benefits do not deteriorate over time or upon return to operating temperature, it changes the whole way the vacuum tube performs. The major benefit has been a dramatic improvement in dynamic range, micro detail with an increase in speed. Bass response has been clearer with a reduction in micro phonics. The proprietary DCT treatment process utilizes a computer controlled, cryogenic chamber to very gradually reduce the temperature of the tubes to 300 degrees below zero (Fahrenheit) and holding them there for a minimum of 24 hours. After the extended dwell at this cryogenic temperature, the vacuum tubes are then very slowly brought up to ambient temperature over the next 24 hours and stabilized. All these processes are microprocessor controlled under strict and verifiable conditions.

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


  • May be used as a passive pre-amplifier (fTIA series only)
  • Comprehensive manual supplied
  • Hand wired point to point
  • Class A Triode front end Output circuit
  • Ultralinear or Triode switchable for specified models
  • Wide Frequency Respnose / Low Distortion Tertiary custom output transformers (10Hz to 65KHz)
  • Exclusive "Closing Coupled Circuit" for our tailor-made output transformers
  • Built in Bias & tube test meter for specified models
  • 3 potted transformers to reduce transformer noise
  • Japan ALPS Blue volume pot
  • Solen/SCR, M-Cap or Jensen Hi Fi quality audio capacitors
  • DCT3 silver plated power cord
  • DCT3 Pure Silver or Silver plated PTFE audio cable
  • Double silver plated, double rhodium plated DCT Input & speaker terminals
  • DCT input RCA terminals and output speaker cable terminals which are 4N OFHC with inner silver layer is 1.5 microns thickness and the outer rhodium layer is 0.5 microns thickness
  • DCT IEC power input
  • High technology soldering process with LEAD-FREE 2% SILVER SOLDER ensures consistency


Product Increcable - iAmp TPA-280 - Reference Series Tube Power Amplifier (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
Inter-Modulation Distortion

Maximum Inter-Modulation 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 Impedence 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
Pre-Amplifer Tube Compliment
  • 2 -6SL7 Preamp Circuitry
  • 2 -6SN7 High Level Circuitry
Power Amplifer Tube Compliment 4 - KT66
Power Regulation 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

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