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Tube Amp Doctor - EL34-SVT Premium - Power Tubes

SKU: RT251


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Legendary winged "C" selected from the original Svetlana production

The Svetlana EL34 is very dependable and our recommended choice for combos. It has little less power, but therefor a nicely balanced tone with fine heights, very detailed and musical mids and just the right amount of bass. This tube is another example where our TAD burn-in and matching processes optimize the sound potential of any tube: the clear and lively tone and its three-dimensional character that can be achieved with matched TAD tubes speaks for itself.

The TAD EL34-SVT is identical to the stock tube used by Marshall for the JCM2000 TSL/DSL series. It is the only EL34 version that we do recommend for these amp models.


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) - 5.7V(min), 6.3V(nom.), 6.9V(max)
  • Current - 1.6A

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 - bass sleeve and heater <16pF
  • Plate to Cathode and grid no.3, grid no.2 - Bass sleeve and heater <0.6pF / grid no.1 <1.1pF


  • Operating position - Any
  • Base - octal, 8-pin
  • Dimensions - 113mm (height), 98mm (seated height), 32mm (diameter)
  • Cooling - Convection
  • Approximate net weight - 60g

AF Power Amplifier

Maximum Ratings

  • DC plate voltage - 800V
  • Grid no.2 DC (screen) voltage - 500V
  • Grid no.1 (control) voltage - -100V
  • DC Cathode current - 150mA
  • Plate dissipation - 25W
  • Grid no.2 DC (screen) dissipation - 8W
  • Bulb Temperature (surface hottest point) - 250 degrees celcius

Typical Operation

AF Power Amplifier, Class A1 (single tube)

  • Plate Voltage - 250V
  • Grid 2 screen voltage - 250V
  • Grid 1 control voltage* - -14V
  • Peak AF Grid 1 control voltage - 14V
  • Zero signal plate current - 100mA
  • Maximum signal plate current - 105mA
  • Zero signal grid 2 screen current (avg) - 15mA
  • Transconductance (nominal) - ca 9,500 mS
  • Load resistance - 2000 Ohms
  • Output power at 5% distortion - 10W