Pinnacle / EF91/M8083-PINNACLE

EF91/M8083-PINNACLE Click on image(s) above to view larger
£4.50

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Pinnacle were valve distributor based in London who were the principle suppliers of most of the UK Radio and TV repair shops. They bought in huge bulk and as they were in competition with Mullard and Brimar they tended to buy valves from very good factories. Most tended come from Tungsram in Hungary, the Japanese Matsushita factory and Government sources across the world and they branded them Pinnacle. They stated that they offered the pick of the world’s best valve.They certainly did as these valves offer great value for money and all are from good NOS factories
The M8083 is a special quality version of the EF91. The M8083 has a more rugged build than the EF91 and was designed for applications where vibration during operation
was an issue.

The EF91 is a high gain, high impedance, high slope, screened pentode that was used mainly in radio. In radio it was used for RF and IF amplification, for oscillators and frequency multipliers.

Mullard state in handbooks dating back to 1950 that the EF91 is intended for use as RF amplifiers or mixer valves in television receivers. These were made by Mullard but come pinnacle branded and boxed.

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