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Coffman Labs, LLC www.coffmanlabs.com
You have just purchased the Coffman Labs' G1-A, a limited-
edition artisanal piece of audio equipment. This pre-amplifier
is a heritage item manufactured with care in Portland, Oregon.
Your G1-A is _______ / 500, purchased on _______________.
Authenticated by Damon Coffman, Founder of Coffman Labs:
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Summary of Contents for Coffman Labs G1-A
- Page 1 Coffman Labs, LLC www.coffmanlabs.com You have just purchased the Coffman Labs’ G1-A, a limited- edition artisanal piece of audio equipment. This pre-amplifier is a heritage item manufactured with care in Portland, Oregon. Your G1-A is _______ / 500, purchased on _______________.
- Page 2 BEFORE turning the unit on. This insures proper operation and safety of all parts. The G1-A does not contain any internal parts that may modified or serviced by the user. Attempting to fix or change any interior component of your amplifier will void your warranty.
- Page 3 Over three years were invested in prototyping and perfecting the design of the G1-A. We took great care in selecting each of the specialized components. This is an exceptional piece of audio...
- Page 4 Coffman Labs, LLC www.coffmanlabs.com SETUP (PLEASE READ!) The G1-A is very simple to set up. There are just a few things to remember as you begin: 1. Always connect the power cable that runs between the power supply and preamplifier before turning the unit on.
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Page 5: Operation
Volume: Controls both the left and right channels. Tip: The Volume control’s position may be anywhere from 8AM to 6PM, depending on the sensitivity of your power amp. The G1-A will safely run from low to full volume without distortion. - Page 6 Coffman Labs, LLC www.coffmanlabs.com Tips for output control: 1. Do not change the output control if recording. Like the input control, there may be occasional small pops when changing the control. This really depends on the nature of your power amp input and the types of sources connected.
- Page 7 Phono Inputs MM/MC: Connect your phono player to the proper input, depending on your cartridge. Your G1-A may have two MM inputs or an MM and an MC. The lower MM input allows 47K/70K/95K input impedance selection to match your cartridge.
- Page 8 PHONO GROUND CONNECTION: (red circle on the rear panel diagram) Provided because many turntables have a separate ground wire; most of the time this will not be required. The G1-A runs on isolated power and a separate ground will not usually improve the connection.
- Page 9 Euro and USA tubes as well, and you may contact us with any tube-related questions. We specifically screen all of our appropriate tube types for use in the G1-A, so you may buy from us with confidence at www.coffmanlabs.com.
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Page 10: Specifications
Coffman Labs, LLC www.coffmanlabs.com SPECIFICATIONS Inputs: 5-position Selector Switch: Phono, Mute, S1, S2, or S3 selected at Front Panel Phono: Rear Panel Switch selects type: MM1 selectable impedance 47K / 70K / 95K MM2 (95k) or MC based on purchase option Mute: Shorts all inputs plus REC Out S1 &... - Page 11 Coffman Labs, LLC www.coffmanlabs.com Equalization: [measured into a 5 ohm load on MC input] Passive RIAA, Paper-in-Oil (PIO) capacitors used for filters. +0.5/- 0.2 dB 20Hz-20KHz (typical) 1Khz standard. 7 Hz rumble filter inherent in Phono Section Frequency Response: Line Stage: 20Hz–100KHZ +0.2/-0.5dB; 15Hz–150KHz + /-1.0dB Headphone: -1dB at 15Hz;...
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Page 12: Contact & Warranty
Please contact us prior to returning unit for instructions. Contact Information: info@coffmanlabs.com +1 503 223 2292 (Echo Audio) +1 503 509 0390 (Coffman Labs) Mailing Address: Coffman Labs c/o Echo Audio 1015 SW Washington St. Portland, OR 97205...