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Tube Amp Doctor - EL34B-STR Premium - Power Tubes

SKU: RT161


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Versatile EL34 high-gain with very dynamic tone

Sensational new high-gain EL34 tube with a very dynamic tone. An authentic remake of the British Mullard EL34. The clear and harmonic open top end allows for great clean tone and at the same time the TAD EL34B-STR offers incredibly powerful mids and equally powerful bass. The golden control grid and especially large cooling grids guarantee maximum stability and reliability. Consequently, this EL34 provides a maximum of gain and dynamic response.

This tube is the best choice for all Marshall®, Hiwatt®, Orange® etc. Can replace any 6CA7 or KT77.


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

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

  • Plate Current (PC) and Amplification (TC)
  • Low Noise Test
  • Microphonic Test
  • Sonic Tests
  • Shock Tests
  • Listening Tests
  • Shorts & Leakage Tests


Premium RT-Matching of Power Tubes

Our Premium Matching is an exact matching of power tubes with identical Plate Current (PC) and Transconductance (TC).

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

RohS Compliant





  • Voltage (AC or DC) - 5.8V(min), 6.3V(nom.), 6.8V(max)
  • Current - ca 1.5A

Cathode: oxide-coated, unipotential

cathode-to-heater potential, max - +100V

Direct interelectrode capacitances, max*** -

  • Grid no.1 to cathode and grid no.3, and grid no.2 - base sleeve and heater <15.2pF
  • Plate to Cathode and grid no.3, grid no.2 - Bass sleeve and heater <8.5pF / grid no.1 <1.1pF


  • Operating position - Vertical only
  • Base - JEDEC #8ET, octal, 8-pin
  • Dimensions - 114mm (height),101mm (seated height), 36mm (diameter)
  • Cooling - Convection
  • Approximate net weight - 50g

AF Power Amplifier

Maximum Ratings

  • DC plate voltage - 800V
  • Grid no.2 DC (screen) voltage - 500V
  • Grid no.1 (control) voltage - -300V
  • DC Cathode current - 150mA
  • Plate dissipation - 25W
  • Grid no.2 DC (screen) dissipation - 8W

Typical Operation

AF Power Amplifier, Class A1 (single tube)

  • Plate Voltage - 264V
  • Grid 2 screen voltage - 250V
  • Grid 1 control voltage* - -13.5V
  • Peak AF Grid 1 control voltage - 8.7V
  • Zero signal plate current - 70mA
  • Maximum signal plate current - 100mA
  • Zero signal grid 2 screen current (avg) - 14.9mA
  • Transconductance (nominal) - ca 11,500 mS
  • Load resistance - 2000 Ohms
  • Output power at 13% distortion - 11W