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Philips Company Tubes
Valvo = Amperex = Mullard ???
Characteristics

Understand Codes
Common Labels
Label Colors

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Telefunken Siemens
Telefunken,
Siemens and Lorenz
tubes from 1950 - 1980.

Introduction
Characteristics

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More Types - all brands
Less important
types in stereo tube amps from 1950 - 1980.

Common Introduction
Characteristics

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