JMK Audio are now using the SonicImageryLabs 990Enh Op Amp.
JM-130/JM-530 Features not found on most other mic pres:
Very high Input headroom: for a very wide Dynamic range, ov er 131dB for the JM-130, >128dB for the JM-530.
The Pad is on the output: this has several advantages; One it does not affect the loading and sound on the mic, Two; Since No DC voltage goes thru the switch (Phantom) like most Mic pre pad circuits on other mic pres there is NO pop when the switch is engaged. Third; being on the output allows the output transformer to be driven harder for a warmer sound.
(JM-530) Added Brass thumb screw to aid in removal or installation of JM-530 Module into Lunch Box. (See Bottom Picture)
The Phantom switch: the phantom voltage ramps up to reduce the pop when powering a Condenser mic.
All switches on both the JM-130 & JM-530 are the large Gold plated switch, to provide very long life and improve the clarity of the signal path, and greatly reduce the probability of noise and static.
