LJ 6SL7 MM Phono PreAmplifier

Merek: LJ Audio, Indonesia
Kode Produk: 6SL7-6X5 #4-2015
Ketersediaan: Tersedia
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MM phono preamp by LJ Audio, Indonesia. Custom made only, 2-4 weeks. Budget (with audio-grade parts) start from Rp 4 million (able to upgrade).

  • Model: LJ MM Phono PreAmp, model 6SL7-6X5 #4, published in June 2015. Commercial since Feb, 2008.
  • Designs:
    • Moving magnet (MM) cartridge, 47k input impedance.
    • Circuit topology: two gain-stage anode follower, single-ended pure class A.
    • RIAA equalization: pasive filter.
    • Feedback: zero global.
    • HV supply: tube rectifier, C-L-C filter.
    • Filament supply: symmetrical unregulated, no hum.
    • Fully shielded enclosure (chassis), no interference.
  • Key parts (default):
    • Tubes: 2x 6SL7 Russian miltary (upgradeable), 1x 6X5 Trigon UK (upgradeable).
    • Resistor: Takman REY (Japan), Vishay Roederstein (Germany), Dale (USA).
    • Capacitors: Jantzen Crosscap (Denmark), Wima (Germany), Epcos (Germany).
    • Electrolytic capacitors: JJ (Slovakia), Elna Cerafine (Japan), Elna RE3,  Rubycon (Japan). 
    • Schottky rectifier.
    • Others: LJ Audio custom power trafo and PSU choke.
  • Dimension: 30 x 16.7 x 8.8 cm (L-W-H).
  • Construction: point to point wiring, real star-ground, chassis/earth float to ground line.

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