Introduction:
The product has the functions of balanced input-balanced output, balanced input-single-ended output, and single-ended input-balanced output. It also has 2 RCA input options. Really balanced amplifier circuit, the power supply of left and right channels is completely independent, and the degree of separation is very good.
The circuit reference is from Accuphase C-3850 preamplifier. This circuit is a preamplifier that is worth making and admiring. If you do it with your heart, the effect is much better than most preamplifiers. The sound field is looser, more delicate and warmer. Fascinating, because it is classic, it is far from the comparison between ordinary electronic tubes and independent op amp preamplifiers, and the sound can be compared with the timbre of electronic tubes.
The circuit architecture is JRC5534D Opamp as the basic amplifier. Discrete parts are added to increase the open-loop gain. The voltage and current dual feedback circuit is used to reduce distortion. Using low noise small power transistors 2SA733/2SC945, The output tube uses the original UK tube ZTX450 ZTX550. The output is in Class A status. The music tastes very good.
With AC 110V/220V switch, (this is to facilitate the use of international standards, when you use it, please set its voltage according to your country`s voltage). You can easily switch between 110V/220V.
¡ß Input voltage: AC 110V or 220V (The PCB has a design voltage change switch that allows you to easily switch between 110V or 220V voltage inputs).
¡ß Input impedance: 50K
¡ß Output impedance: 600¥Ø
¡ß Frequency range: 20Hz¢¦50KHz
¡ß Distortion: 0.003%@1KHz
¡ß Signal to noise ratio: 116dB@1KHz
¡ß Transformer output voltage: Recommend 2X18V
¡ß Weight: about 1.25 KG
NOTE 2: We have DIY kit or Finished board (Optional)
¡ß DIY kit ---- All parts need you to solder and test it.
(No transformer, you need to install your own transformer)
¡ß Finished board ---- All parts have been welded and tested OK.
(With 2 PCS BingZi M15-05 2X18V transformer)