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The Siemens EF804-S tube is a special quality low noise tube that is rated to last over... more
Product information "Siemens EF804S Tube NOS"
The Siemens EF804-S tube is a special quality low noise tube that is rated to last over 10,000 hours. Telefunken made this tube for the professional audio/recording industry where it was used in microphones and mic preamps
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