JJ KT77 - SINGLE

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

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.

The newest member in the JJ family of ECC83/12AX7 tubes is the JJ ECC83MG. The MG is a 12AX7 with a bit lower amplification than a standard 12AX7. Our measurements show that the difference is small, but the new tube sounds more linear than the standard JJ 12AX7, and in amps produces a milder, gentler sound. The mechanical construction shows that it is not just another minor variation of the normal JJ 12AX7. The new tube has longer plates.
The JJ ECC83MG is interesting for low and medium gain amplifiers, as well as for audio, where a too hot amp needs to be tamed; as well as an alternative to a 12AY7.

Files:

• Datasheet

• Insulation: Silicon
• Operation Voltage: 300 V AC / 500 V DC
• Test Voltage: 2000 V
• Operating temperatures:    –40 bis +180 °C
• Packing: 5 m
• Cross-Section: 0,25 mm²
• Outer Diameter: 1.6 mm
• Stranded wire structure: tinned copper

• Insulation: Silicon
• Operation Voltage: 300 V AC / 500 V DC
• Test Voltage: 2000 V
• Operating temperatures:    –40 bis +180 °C
• Packing: 5 m
• Cross-Section: 0,25 mm²
• Outer Diameter: 1.6 mm
• Stranded wire structure: tinned copper

• Insulation: Silicon
• Operation Voltage: 300 V AC / 500 V DC
• Test Voltage: 2000 V
• Operating temperatures:    –40 bis +180 °C
• Packing: 5 m
• Cross-Section: 0,25 mm²
• Outer Diameter: 1.6 mm
• Stranded wire structure: tinned copper

• Type: Metalized Polyester Film Capacitors
• Voltage Rating: 400 V
• Tolerance: +/- 10%
• Operating Temperature Range: - 40°C / + 85 °C
• Termination Style: axial

• Type: Metalized Polyester Film Capacitors
• Voltage Rating: 250 V
• Tolerance: +/- 10%
• Operating Temperature Range: - 40°C / + 85 °C
• Termination Style: axial