EC91 6AQ4 Philips

Description

Compact and Capable RF Triode
The Philips EC91, also labeled 6AQ4, is a miniature triode vacuum tube designed for high-frequency signal amplification and oscillator service. Originally used in military radios, test gear, and FM front ends, this tube became a preferred option for circuits requiring precision and reliability. As a result, it remains a staple in vintage restorations and RF engineering projects.

Clear, Stable Signal Performance
Functioning as an RF amplifier or oscillator, the EC91 offers excellent signal gain and frequency stability. It minimizes internal noise, preserving signal clarity even at higher frequencies. Moreover, Philips crafted this tube with tight production standards, ensuring low microphonics and consistent electrical behavior. In addition, it maintains solid performance during extended sessions. Consequently, users can expect clean output and minimal drift in every application.

Space-Saving and Highly Compatible
With a slim glass envelope and B7G 7-pin base, the EC91 fits into compact designs with ease. Therefore, it integrates smoothly into space-constrained equipment like portable radios, signal analyzers, or early televisions. Furthermore, it substitutes directly for common types such as 6AQ4 and CV138. Whether upgrading old gear or constructing a fresh RF module, this tube installs quickly and reliably.

Trusted Philips Engineering
Philips built the EC91 to last, using rugged internal structures and stable materials. It tolerates thermal cycling, mechanical vibration, and continuous use without loss of function. Additionally, its long operating life makes it ideal for restorers and hobbyists seeking dependable vintage performance. Thanks to its proven design, this tube holds its value in both function and authenticity.

Ideal for Restorers and Builders
Whether you’re repairing military-grade radios or crafting RF prototypes, the Philips EC91 provides trustworthy performance, low-noise amplification, and historical accuracy. Choose it for its reliability, ease of use, and the consistent quality Philips is known for.