EC91 6AQ4 AEI Ediswan

Description

Reliable Miniature RF Triode
The AEI Ediswan EC91, also known as 6AQ4, is a high-frequency miniature triode designed for RF amplification and oscillator circuits. Commonly used in military radios, test gear, and early FM receivers, this tube delivers accurate signal performance in compact electronic assemblies. As a result, it remains a preferred option for engineers and vintage electronics enthusiasts seeking dependable, low-noise amplification.

Clean Signal Response and Gain
In RF amplifier and oscillator roles, the EC91 delivers strong gain and consistent performance. It keeps internal noise levels low, ensuring clean signal output in sensitive stages. Moreover, AEI Ediswan’s high manufacturing standards provide excellent electrode alignment and thermal control. In addition, the tube resists microphonics and electrical instability. Consequently, your circuit benefits from improved clarity and stable operation under continuous use.

Compact Format, Versatile Fit
Built in a slim glass envelope with a B7G 7-pin base, the EC91 fits into compact layouts without issue. Therefore, it’s ideal for mobile equipment, laboratory instruments, and vintage communication gear. Furthermore, it’s a direct substitute for types like 6AQ4 and CV138. Whether you’re restoring field-use equipment or upgrading test gear, this tube installs effortlessly while enhancing reliability.

AEI Ediswan Construction Quality
AEI Ediswan, known for producing professional-grade valves, ensured the EC91 met high standards of durability and performance. The tube features strong glass, firm pin connections, and a sturdy internal structure. Additionally, it handles fluctuating conditions and long duty cycles with ease. As a result, the EC91 remains dependable in both civilian and military-grade circuits.

Perfect for Restoration or Prototyping
Whether you’re rebuilding vintage RF gear or creating a new oscillator stage, the AEI Ediswan EC91 offers excellent signal clarity, robust construction, and authentic British quality. Choose this triode for its versatility, smooth amplification, and time-tested performance in compact RF applications.