Audio Research SP6B upgraded

• Frequency Response:
  • High-level section: ± .25 dB, 10 Hz to 30 kHz
  • Magnetic phono: ± 1 dB of RIAA from 30 Hz to 15 kHz
• Impedance
  • Input 50 kOhms
  • Output 500 Ω at 1 kHz
• Distortion (THD): less than .03% at 5 V RMS
• Gain
  • Phono input to tape output, 34 dB
  • Magnetic phono to main output, 60 dB
  • High level inputs to tape output, 0 dB
  • High level inputs to main output, 26 dB

Tubes

• (2) 12AX7 LN
• (4) 12AX7