Lissen

Valve List

H210, HL210, L210 & P220 Advert. •Popular Wireless •September 21, 1929.

2 Volt Valves New Process Advert. •Popular Wireless •November 9, 1929.

Power Pentode Advert. •Popular Wireless •February 1, 1930.

PT225 Advert. •Modern Wireless •April, 1930.

PT225 Advert. •Popular Wireless •December 5, 1931.

Skyscraper' Advert. •Lissen Booklet •1933.

U650

P425