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Tube Amp Doctor - 7025/E83CC Highgrade - Preamplifier Tube

Save $10.00
Original price $79.00
Current price $69.00

No microphony, no hum, clean warm tone, punchy mids, fat overdrive

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

 

HIGHGRADE SELECTION - But only those tubes which pass these tests best are labeled Highgrades.

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

 

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 - 120V

Direct interelectrode capacitances, max***

  • Grid to plate - 3.2pF
  • Grid to cathode - 2.4pF
  • Grid to heater - 1.2pF
  • Plate to cathode - 1.0pF

Mechanical

  • Operating position - Any
  • Base - E9-1, small button 9-pin
  • Dimensions - 56mm(height), 50mm(seated height), 22mm(diameter)
  • Cooling - Conventional
  • Approximate net weight - 13g

AF Power Amplifier

Maximum Ratings

  • DC plate voltage - 300V
  • Positive DC grid voltage - 0V
  • Negative DC grid voltage - -55V
  • DC cathode current - 8mA
  • Plate dissipation - 1.0W
  • Bulb temperature (surface hottest point) - 160 degrees celcius

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