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Poor Design for a Preamp

"To limit output I put a series resistor of 330K to the output RCA with 100K to ground at the RCA"

Your later comments regarding HF response and testing indicate that you don't understand how this all works together. Below is the frequency response of the 300K/100K combination driving your 175pF cable. And this doesn't account for the additional output impedance of the 01A anode or input capacitance of the amplifier. In addition to high frequency loss, phase (dotted line) is badly shifted.









Edits: 02/16/25

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