The Phædrus Audio SPIRIT SupertubeTM matches the dimensions of a standard B9A base device.
The Phædrus Audio SPIRIT possesses a low anode impedance which ensures that it will match with a wide range of output transformers: and its very low initial electron-velocity input current ensures the tube matches a wide range of modern and vintage capsules. Internal self-biasing reduces external circuitry to a minimum.
“..... the SPIRIT Supertube can be used to revisit a classic microphone design without the requirement of a special power-supply.”
A full datasheet for the Phædrus Audio SPIRIT SupertubeTM is available.
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