Japan Marantz HDAM audio linear amplification circuit, sound quality is very good, excellent low frequency, full midrange, high frequency delicate, comfortable listening, the flavor of the tube, not op amp preamp can be compared. Unfortunately, the late core tube K170 discontinued, with K246 K30 and can not restore her beautiful sound quality.
This section uses and K170 characteristics are identical to the original Toshiba instead of tubes, patches containing 2 pieces of the same characteristics of the 2SK tube eliminates the trouble of pairing, distortion indicators lower. The output adopts high-current BD139 BD140 as Class A output, which has better driving force and can even drive low-resistance headphones. It can even drive low-resistance headphones. It is more convenient to match with amplifier.
Double-sided gold-plated PCB.
The voltage regulator is ON's LM317337, NOVER gold capacitors.
German red WIMA, Beijing 718 copper feet resistors.
Small tubes using Philips vocals very good BC556546.
Commodity parameters:
PCB size: 136X122MM
Power supply range: AC14X2 to AC18X2
Recommended external potentiometer resistance: 50-100K
Frequency band: 10HZ-40KHZ
Output Impedance: 47K
Output Impedance: 10 Ohm
Amplification: 4 times (default)
Resistance setting can be modified 1-20 times
Package:
1pc Replica Classic Reproduction Maran HDAM Sweet Vocal Preamplifier Original Toshiba Field Effect Input Tube
