500 Series Mic Preamps 2011

Dec 1, 2011 9:00 AM, By Matt Gallagher

A BUYER'S GUIDE TO A WIDE VARIETY OF FRONT-END OPTIONS

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ONLINE EXTRAS

READ:
Eddie Ciletti on the 500 Series

JLM AUDIO BA500 MIC PRE
Basics:
variable input impedance (200-3k Hz), continuously variable 41-detent input gain from 20 to 60 dB, switchable polarity, 20dB pad, 48V phantom power (with red LED), active FET ¼-inch DI, 34mm white LED backlight, classic buffered output VU meter with adjustable 0dB reference
Extra: JLM99V fully discrete Class-A transistor op amp audio path design, including JLM transformers for balanced input and output
JLM Audio BA500 product page

JLM AUDIO DUAL99V500 MIC PRE
Basics:
variable input impedance (200-3k Hz), switched 5dB step input gain from 20 to 75 dB, continuously variable output trim, 5dB range (pull for 90dB range), switchable polarity, 20dB pad, 80Hz HPF (with orange LED), 48V phantom power (with red LED), active FET ¼-inch DI with blue backlight
Extra: dual JLM99V fully discrete Class-A transistor op amp audio path design, including JLM transformers for balanced input and output
JLM Audio Dual99v500 product page

JLM AUDIO NV500 MIC PRE
Basics:
variable input impedance (200-1.2k Hz), switched 5dB step input gain from 20 to 75dB, continuously variable output trim, 5dB range (pull for 90dB range), switchable polarity, 20dB pad, 80Hz highpass filter (with orange LED), 48V phantom power (with red LED), active FET ¼-inch DI with blue backlight
Extra: classic fully discrete Class-A transistor, two preamp and one output amp circuitry design, including JLM transformers for balanced input and output
JLM Audio NV500 product page

JLM AUDIO TG500 MIC PRE
Basics:
variable input impedance (200-3k Hz), switched 5dB step input gain from 20 to 75dB, continuously variable output trim, 5dB range (pull for 90dB range), switchable polarity, 20dB pad, 80Hz HPF (with orange LED), 48V phantom power (with red LED), active FET ¼-inch DI with blue backlight
Extra: minimal six transistor, fully discrete, Class-A circuitry design, including JLM transformers for balanced input and output
JLM Audio TG500 product page

LACHAPELL AUDIO MODEL 583E
Basics:
features the same amplifier stage found on the 583S, including the Jensen JT-115k input transformer with an ultra-clean, transformerless 3-band EQ section with fully sweeping frequency controls and cut/boost settings of +/-8 dB
Extra: EQ can run as an integrated EQ, serving the preamplifier or separate as its own autonomous module, where both units run independently
LaChapell Audio Model 583E product page

LACHAPELL AUDIO MODEL 583s
Basics:
Less than 70 dB of gain with a typical non-weighted EIN of -120 dB referencing 150-ohm load, equipped with one 12AX7/ECC83 tube and a frequency response of 12 to 70k Hz, the 583s uses the Cinemag CMMI-10 or the optional Jensen JT-115K-E input transformer, and features a maximum output of less than 26 dBu
Extra: input stage is based on LaChapell’s 992EG platform in single-ended form, coupled with high-quality Burr Brown and THAT Corporation output drivers
LaChapell Audio Model 583s product page

LIPINSKI SOUND L-609
Basics:
all discrete, Class-A patented circuitry (Lipinski Square modules); 8-position LED peak/VU meter, switchable inside; resistor-less -20dB pad skips one stage of amplification to maintain signal quality; precision rotary gain control; minimal internal signal wiring; XLR or hi-Z instrument input; polarity switch, 48V phantom power
Extra: no capacitors or ICs in the signal path, transformerless/transformer input mode, proprietary circuit emulates amorphous core transformer, gain control is implemented in negative feedback loop
Lipinski Sound L-609 product page

MAAG AUDIO PREQ4
Basics:
single-channel mic preamp, 65dB adjustable gain, phase-reverse capability, 70Hz HPF, 48V phantom power, -20dB pad, +27 dBu of headroom, -124dBu EIN, maximum phase shift of 25 degrees
Extra: Air Band (shelf boost from 2.5 to 40 kHz via Vari Air)
Maag Audio's Website






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