Would you like to try passive pre amplifier.
They are available on Ebay, tube and SS version.
The guy is from Poland and he is using high quality parts
3 inputs and 2 outputs. Totally neutral,
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Number of steps: 48
Contact material: Hard gold
Polished wiper and contact pins
Extremely short signal path
Channel matching: +/-0.1 dB
Resistance: 10, 20, 50 or 100 kOhm (other values on request)
Resistors: INPUT - Caddock MK132; GND - military Vishay/Dale RN55 1% 100ppm , 1/10W, low noise, non-inductive, metal film
Upgrade options:
Remote control - $200
Vishay Zfoil series resistor - $60
Takman REX shunt resistors - $70