ECH81 Telefunken

Description

High-Precision Frequency Conversion
The Telefunken ECH81 is a premium triode-heptode tube that combines oscillator and mixer functions in a single compact envelope. It plays a key role in the front end of AM/FM radios and RF circuits, especially in European receivers from the 1950s and 1960s. Designed for accuracy and durability, this tube consistently delivers clean intermediate frequencies and stable tuning.

Smooth Signal Mixing and Clarity
The triode section generates a steady oscillator signal, while the heptode mixes it with incoming RF to produce a reliable intermediate frequency. Moreover, Telefunken’s engineering ensures minimal noise, tight channel separation, and excellent linearity. Thanks to its low microphonics and high internal consistency, the ECH81 helps maintain long-term tuning stability in sensitive applications.

Compact and Widely Compatible
Built with a standard B9A 9-pin base, the ECH81 fits easily into most European and UK-made tube radios. It directly replaces types like 6AJ8 and CV2128. Therefore, it supports seamless restoration work and component upgrades. Furthermore, its compact design makes it perfect for tightly packed receiver chassis and integrated tuner stages.

Exceptional Telefunken Craftsmanship
Telefunken’s reputation for quality remains unmatched. This ECH81 features strong internal construction, precise alignment, and a durable glass envelope. It resists vibration, heat drift, and electrical instability over long operating hours. As a result, you can count on it for consistent, long-term use in demanding RF environments.

Perfect for Vintage Audio Restorations
Whether you’re restoring a high-end radio or designing a custom tuner stage, the Telefunken ECH81 offers exceptional frequency conversion, low noise, and lasting performance. Choose this tube for its trusted German engineering and superior signal integrity.