Up for sale is a world-class matched pair (2 pieces) of Mullard E180F / 6688 Special Quality pentodes. These are premium Made in Holland specimens featuring Gold Pins, Triple Mica internal supports, and a Top Ring Getter. Designed for high-frequency wide-band applications, these tubes are prized for their extreme transparency and low microphonic signature.

Precision tested on our Amplitrex AT1000 digital laboratory system, the results below utilize the Percentage Method against original factory design-center specifications (Ip = 13.0 mA / Gm = 16500 µMhos). This pair is exceptionally strong, testing well above 100% nominal values.