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Tube Amp Doctor - 12AT7/ECC81 Premium (Balanced) - Preamplifier Tube

Save $10.00
Original price $99.00
Current price $89.00

Low noise tube, selected for best symmetry and balance

A strong driver tube and a wounderfully rich-sounding reverb driver.Also used in the great Brocksieper EARMAX / EARMAX PRO headphone amps and other High-End Audio amplifiers.

 

Q: When does a preamp tube become a Premium Selected tube?

A: All preamp tubes labeled Premium Selected have passed the following tests:

  • Low Noise Test
  • Microphonic Test
  • Gain Test
  • Sonic Tests
  • Shock Tests
  • Listening Tests
  • Balanced Output Test

Matching and Selecting Options for Preamp Tubes

Matching in Pairs for preamp tubes means that two tubes show identical gain, hence, four characteristically identical systems. This matching method includes our Balance-Selection. We highly recommend this matching method for hi-fi systems.

TAD Premium Selected/Highgrade tubes are guaranteed for a period of 6 months (according to terms of warranties) for the quality criteria mentioned above.

RohS Compliant

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Specifications

Electrical

Heater

  • Voltage (AC or DC) - 12.6V +/- 1.0 (Series), 6.3 +/- 0.5 (Parallel)
  • Current - 0.15(Series), 0.3 (Parallel)

Heating - Indirect

Cathode-to-heater potential, max - 100V

Direct interelectrode capacitances, max***

  • Grid to plate - 1.5pF
  • Grid to cathode - 2.2pF
  • Grid to heater - 1.4pF
  • Plate to cathode - 0.2pF

Mechanical

  • Operating position - Any
  • Base - E9-1, small buton 9-pin
  • Dimensions - 56mm(height), 49mm(seated height), 22.5mm(diameter)
  • Cooling - Conventional
  • Approximate net weight - 13g

AF Power Amplifier

Maximum Ratings

  • DC plate voltage - 330V
  • Positive DC grid voltage - 0V
  • Negative DC grid voltage - -55V
  • DC cathode current - 15mA
  • Plate dissipation - 2.5W
  • Bulb temperature (surface hottest point) - 190 degrees celcius

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