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Originally built as a PA amp in the postwar era, the Stromberg-Carlson 58-AU is pure American iron—all-tube, and transformer-rich. The unit has been converted into a high-gain tube mic preamp, retaining the soul of the original while delivering modern studio functionality.
Modifications include:
Full recap and resistor upgrade
IEC power connector for standard AC cables
XLR mic input and balanced line-level output
+48V phantom power and phase switch added
Grounded for studio safety and noise performance
What you get is classic tube saturation, vintage tone, and a silky front-end ideal for vocals, guitar amps, bass or drum overheads.
Originally built as a PA amp in the postwar era, the Stromberg-Carlson 58-AU is pure American iron—all-tube, and transformer-rich. The unit has been converted into a high-gain tube mic preamp, retaining the soul of the original while delivering modern studio functionality.
Modifications include:
Full recap and resistor upgrade
IEC power connector for standard AC cables
XLR mic input and balanced line-level output
+48V phantom power and phase switch added
Grounded for studio safety and noise performance
What you get is classic tube saturation, vintage tone, and a silky front-end ideal for vocals, guitar amps, bass or drum overheads.