This listing is for a matched pair of vintage Telefunken RS242 direct-heated triode tubes. Both tubes were tested on a Metrix U61B tube tester under the following conditions: filament voltage at 3.8 V, plate voltage at 300 V, and grid bias at -5 V. The measured plate currents are 34 mA and 37 mA, respectively, indicating 100%+ emission based on the nominal full-current value of approximately 36 mA.
The RS242X is a rare and robust triode, originally developed by Telefunken in the 1940s for military transmitter applications. With a maximum anode voltage of 400 V and an anode dissipation of 12 W, it is well-suited for high-fidelity audio amplification. The tubes feature a distinctive deep black plate structure and are known for their excellent linearity and low distortion characteristics.
Cosmetically, both tubes are in excellent condition, with clear glass envelopes and intact internal structures. The etched Telefunken logos and production codes are well-preserved. These tubes are ideal for collectors and audiophiles seeking authentic vintage components for high-end audio applications.
This matched pair of Telefunken RS242X tubes offers exceptional performance and historical value. Their robust construction and excellent electrical characteristics make them a superb choice for high-end audio applications or for collectors seeking rare vintage components.
Tested using a Metrix U61B tube tester. Please note that readings can vary between different tester models and calibrations. No returns accepted based on test result discrepancies from other equipment.
Each tube is inserted into a high-durability plastic sleeve, cut to size, then wrapped with a protective plastic film. This assembly is placed inside shock-resistant foam and securely boxed. I exclusively use DHL Express for fast, trackable, and reliable shipping worldwide.