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Tube Amp Doctor - EL34L-CZ Premium - Power Tubes

Save $10.00
Original price $89.00
Current price $79.00

Punchy mids and well-focused bass power

The E34L is a long-life EL34 type tube with thick and especially solid glass. It delivers lots of bite in the top end, punchy mids and well-focussed bass power. A wonderful EL34, with great tone for Hi-Fi as well as for musical instrument amplifications.

Our burn-in process increases the electrical stability of this tube immensely. This increased stability is the basis for our subsequent matching process. Our TAD matching-process takes into account the dynamic aspects of tubes and allows for precise matching under real operating conditions. This process enables us to achieve an unparalleled sound quality.

 

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

 

Specifications:

Electrical

Heater:

  • Voltage (AC or DC) - 5.8V(min), 6.3V(nom.), 6.8V(max)
  • Current - 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 <15.5pF
  • Plate to Cathode and grid no.3, grid no.2 - Bass sleeve and heater <1pF / grid no.1 <1.3pF

Mechanical

  • Operating position - Any
  • Base - octal, 8-pin
  • Dimensions - 112mm (height), 98mm (seated height), 33.3mm (diameter)
  • Cooling - Convection
  • Approximate net weight - 60g

AF Power Amplifier

Maximum Ratings

  • DC plate voltage - 800V
  • Grid no.2 DC (screen) voltage - 450V
  • 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* - -15V
  • Zero signal plate current - 100mA
  • Maximum signal plate current - 105mA
  • Zero signal grid 2 screen current (avg) - 15mA
  • Transconductance (nominal) - ca 10,000 mS
  • Load resistance - 2000 Ohms
  • Output power at 5% distortion - 10W

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