TT EL84 - Classic Series - QUAD

The high-quality TTEL84/6BQ5 tube with 12 watts of power is perfect for guitar, bass, and audio amplifiers. Inspired by classic NOS EL84 models, this tube is manufactured using modern production methods to ensure consistent high quality.

It offers an ideal combination of sound and reliability and is a direct replacement for all EL84 or 6BQ5 tubes.

Electrical Specifications

• Type: Pentode
• Base: Noval (B9A)
• Heater Voltage: 6.3 V (min 5.8 V / max 7.7 V)
• Heater Current: approx. 0.76 A
• Anode Dissipation: 12 W
• Screen Grid Dissipation: 2 W

Operating Conditions

• Anode Voltage (Va): max. 300 V
• Screen Grid Voltage (Vg2): max. 300 V
• Grid Bias Voltage (Vg1): -7.3 V (typical for Class-A operation)
• Anode Current (Ia): 48 mA (at -7.3 V grid bias)
• Screen Grid Current (Ig2): 5 mA

Characteristic Curves

• Amplification Factor (μ): approx. 20
• Internal Resistance (Ra): approx. 38 kΩ
• Transconductance (S): 11 mA/V

Mechanical Specifications

• Length: approx. 70 mm (without pins)
• Diameter: approx. 22.5 mm
• Weight: approx. 25 g

Typical Applications

• Class-A Amplifier: 5.7 W output power at 250 V Anode voltage, 48 mA Anode current
• Class-AB Amplifier: 17 W output power at 300 V Anode voltage, 48 mA Anode current per tube (Push-Pull configuration)

Pinout

1. g1 (Control Grid)
2. k, g3 (Cathode, Screen Grid)
3. h (Heater)
4. h (Heater)
5. a (Anode)
6. • (no connection)
7. • (no connection)
8. g2 (Screen Grid)
9. g3 (Screen Grid)

Usage Notes

• Operating Temperature: Should be operated in a well-ventilated enclosure to prevent overheating.
• Interchangeability: EL84 can be replaced by the Russian 6П14П or American 7189, taking into account different specifications.