Ortofon ST M25 MC Transformer



Ortofon ST-M25 Moving Coil transformer ST-M25 moving coil transformer is designed exclusively for the SPU Mono CG 25 Di MkII and SPU Mono CG 65 Di MkII. The voltage output of these cartridges is too low to connect to the MM -INPUT terminal of amplifiers or phono-equalizers, resulting in inadequate sound volume. ST-M25 is specially designed to increase voltage by 12dB to match MM input of the ordinary amplifiers or phone-equalizers. These cartridges supply the same monaural sound from both L/R channels, therefore L/R channels of the cartridges should be connected through ST-M25 and amplifier to the final output “speakers (L/R) ". You can enjoy robust sound of monaural sound coming from L/R speakers.


Product Features:

  • Frequency: 10-100 kHz +/- 1 dB
  • Step up: 12dB (1 kHz) CA/CG 25/65 Di MkII
  • Input impedance: 5 Ω - 50 Ω
  • Load impedance: > 47 kΩ // 200 pF
  • Dimensions: 65mm(W) × 39mm(H) × 98mm(D)
  • Weight: 410 g


ST-80 SE Moving Coil Transformer Ortofon’s dual mono ST-80 SE is our top-end model, magnetically shielded in a permalloy case, which in turn is installed into a robust aluminum cylinder bored out of solid aluminum. This massive metal housing effectively reduces the influence from vibration and other external interference sources while ensuring best performance with low noise and the highest channel separation. Internal point-to-point wiring is made by Teflon insulated, solidcore pure OFC copper-wire plated with gold, together with high quality gold plated RCA jacks that provide the optimum signal transmission and integrity without any coloration. The functional stability of the transformer is superb thanks to its substantial weight of 1.5 kg. The ST-80 SE delivers detailed reproduction with a touch of warmth accompanied by a full-bodied sound quality.

Application The ST-80 SE is an SUT for connoisseurs and will enhance the performance of any high quality, low output, low impedance MC cartridge. Highly recommended for the SPU cartridges as well as for MC A95, MC Anna, Xpression and MC Windfeld.