Wireless World, November, 1959.

Valves Advertised:

OA2, OA2WA, OA3, OB2, OB2WA, OC2, OC3, OD3, QS75/20, QS75/60, QS83/3, QS92/10, QS95/10, QS108/45, QS150/15, QS150/45, QS1200, QS1201, QS1202, QS1203, QS1204, QS1209/5651, QS1212, QS1213, STV280/40 & STV280/80.