Up for sale is an exceptionally rare matched pair (2 Pcs) of vintage NOS DET25 / VT25 power triode valves, packed in original UK government military boxes (broad arrow marked, 10E/7312). Manufactured in Great Britain, these ultra-collectible tubes feature high-grade black plate construction, an iconic inverted cup getter, clear glass, and rugged internal mounting. Highly prized by single-ended triode (SET) audio purists for their sublime tonal purity, rich texture, and outstanding spatial detail in high-end power amplifiers and custom driver circuits.

Both tubes have been thoroughly tested on an AVO Type 160 valve tester. Anode Current (Ia) measurements alongside percentage performance ratings relative to standard factory reference specs (45.0 mA) are detailed in the table below.