National 6BM8 NOS tubes pair

I found this authentic pair of 6BM8 ECL82 National NOS (New Old Stock) tubes, manufactured in Japan by Matsushita Electric. Renowned for their robust construction and warm, detailed sound signature, they are ideal for Hi-Fi audio amplifiers and vintage repairs. Individually tested on a Kyoritsu tester to ensure optimal emissions. The price is per pair and includes the original box.

Manufacturer: Matsushita Electric Ind. Co., Ltd. (Japan).

Type: Triode – Power Pentode.

Filament Voltage (Vf): 6.3 Volts (AC/DC).

Filament Current (If): 0.78 Amps.

Base: B9A (Noval).

Plate Dissipation (Pentode): 7 Watts (Max).

Plate Dissipation (Triode): 1 Watt (Max).

Amplification Factor (Triode): µ ≈ 70.

Transconductance (Pentode): 6,400 µmhos (approx).

Condition and Testing of the 6BM8 ECL82 National NOS Tube (Quality Guarantee)

Each unit is NOS (New Old Stock), meaning it is an old product that has never been sold or used.

Emissions Test: Each tube has undergone rigorous emissions testing on a Kyoritsu precision tube tester, confirming that the cathode current values are within the “Good” operating parameters.

Appearance: Straight pins, clear glass (often smoked glass or “grey glass,” typical of high-end Japanese models) and legible screen printing.

Presentation: Delivered in its original “National” cardboard box (the box may show signs of storage over the decades, which certifies its age).