The design is based on the legendary Marantz 7 valve preamp with completely new designed power supply section. JM-70H employed two EI transformers supplying more than enough AC power to two separate SSHV2 shunt regulators, one in each channel for high voltage supply. As a result, the preamp sounds much more transparent, detailed and energetic than any of those with CRC/CLC or serial regulator designs. JM-70H is a preamp that has achieved a level of performance that can be favorable for many experienced audiophiles for the cost of an entry level preamp of big names.
From PCB design to selection of components, JM-70H is not compromised at all. Quite a number of expensive components are used , such as Amrg, Kiwame carbon film resistors, and Mundorf Evo oil , Wima MKP capacitors. All PCB used are heavy duty 2.0mm thickness with 2OZ copper FR4 boards. The chassis is fully made of aluminum with the front panel thickness being 8mm. All panels are completed by CNC machine.
Basic Specification
Tubes Used: V1: Tungsol 12AX7 Golden Pins, V2/V3: JJ 5751
Filament Arrangement : 6.3V AC
Input: 3 sets of RCA for CD/DAC/AUX signals
Output: 1 set of RCA with automatic delay on start up or muting manually by push button on front panel.
Gain: 20db
Output Noise Level: 0.08mv (when input shorted to ground)
Power: 230V/240V
Power Consumption: 40W
For more info or an arrangement of trial, please contact sales@consoletronics.com
We are Sydney based audiophiles in electronics business.
SSHV2 Shunt Regulator:
Main Board
Input Module
Top view of JM-70H
Packaging
