Up for sale is an exceptionally matched pair (2 pieces) of vintage Mullard EL42 audio output pentodes, brand new in their original factory Mullard boxes. Made in Great Britain, these desirable early-construction tubes feature grey plates and top square getters. Prized by audiophiles and custom amplifier builders for their outstanding musical clarity and smooth vintage British tonal character in compact power output and driver circuits.

As shown, both tubes have been thoroughly tested on a calibrated precision AVO Type 160 valve tester. Anode current (Ia) and mutual conductance (mA/V) measurements alongside percentage performance ratings are detailed in the table below.