EF40 – Pentode NOS

EF40 – Pentode NOS (New Old Stock)

The EF40 is a high-slope RF pentode intended for use in RF and IF amplification stages of radio receivers and professional communications equipment. It features a B8A Rimlock base and an all-glass envelope. Introduced in the post-war era, the EF40 was used extensively in European electronics, offering reliable high-frequency performance in a compact form factor. It is similar in application and performance to the later EF86, although optimized for RF use. 

• Tube Type: RF Pentode
• Base: B8A (Rimlock 9-pin)
• Heater Voltage: 6.3V
• Heater Current: 0.2A
• Typical Anode (Plate) Voltage: 250V
• Use Cases: RF/IF amplifier stages in radio receivers, professional audio and communications gear
• Equivalents: CV138, Z719

The product image is not necessarily taken of the product being sold. Always check the datasheet for specs. The values listed are taken from various sources and may not always be accurate.