GM_phono v.3.0

  • Unique Transformer-Fet-Transformer circuit.
  • Three inputs ( 2 MC, 1 MM) individually selectable and adjustable
  • Five pre-selected equalization curves
  • 72 dB of gain (55 dB MM)
  • Balanced / Unbalanced inputs and outputs
  • 10 mm machined aluminum alloy chassis

Technical data and main features

  • MC 1 – MC2 gain: 71dB (0.1mV – 1.2mV)
  • MC3 / MM gain: 51dB (1.2mV – 5mV)
  • MC3 / MM frequency response (RIAA) 20Hz- 20KHz +/- 0.1dB — 6Hz – 150KHz at -3dB
  • MC1 / MC2 frequency response (RIAA) 20Hz- 20KHz +/- 0.1dB — 8Hz – 120KHz at -3dB
  • Equalization filters (deemphasis): 5 independent
  • L-R balance: within +/- 0.1dB
  • Equalization curve accuracy within +/- 0.1 dB
  • Crosstalk (stereo separation) > 80dB
  • Total harmonic distortion (THD) @ standard level (0dBu = 0.775V) <0.05%
  • THD @ International Sudio Level (+ 4dBu – 1.22V) <0.07%
  • Signal to noise ratio (SNR) referred to 0dBu (0.775V) output:> 100dB A
  • Max Vout: 12.4Vrms (35VPeP)
  • MC1 / MC2 load impedance variable in five values: 30; 100; 300; 500; 1K Ohm (@ 1KHz)
  • MC3 / MM load impedance variable in five values: 10kΩ; 22kΩ; 47kΩ; 47kΩ + 220pF; 95kΩ.
  • Output impedance = 220 Ohm (1KHz) XRL and RCA
  • 0° / 180° reversible output signal phase
  • automatic anti bump and muting circuit at power on and off
  • Power supply 230Vac 30VA max. (transformer designed for 115Vac)
SELECTOR POSITIONTURNOVERROLLOFFMAIN LABELS
A RIAA500R-13.7RIAA; RCA; New Orthophonic
B500R-12.3EMI LP; AES; London; Ne (RIAA Neumann pole)
C500-10.5DIN; Teldec; DGG; DECCA; Mercury; ffrr LP
D400-5Philips; Telefunken; including many 78
E500C-16Columbia Lp; NAB; NARTB