Stereophile
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<p><img class="story_image" src="http://www.stereophile.com/images/060213-CoffmanSystem-600.jpg" /></p> Audio Machina speakers were featured in the Coffman Labs room, driven by Manley New Classic SE/PP300 monoblocks, but my attention was drawn to this superbly finished preamp from Coffman, the G1-A ($5495, $5795 with remote), which includes a phono stage and headphone output, and is being produced in a limited edition of 500 units. The rest of the system included Music Hall’s MMF9.1 turntable fitted with a Sumiko Blackbird cartridge, Parasound’s great-sounding Halo CD1 CD player, and an Audience Adept Response power conditioner. Also in the room was Coffman’s similar-looking H1-A tubed headphone amplifier ($2295).
<p>
<img src="http://www.stereophile.com/images/060213-Coffman-600.jpg" width="600" border="0" /></p><p>
Turning over the G1-A, I was struck by the complexity of the hard-wired construction. All the capacitors are oil and paper types, the switches are all 1950s-era NOS, and chokes are used in the signal path rather than resistors. Power-supply rectification is performed with the classic 5AR4 diode tube; and note the careful spacing of the signal-carrying conductors.
</p>
[Source: http://www.stereophile.com/content/coffman-labs-“hand-built-portland”]
<p>
<img src="http://www.stereophile.com/images/060213-Coffman-600.jpg" width="600" border="0" /></p><p>
Turning over the G1-A, I was struck by the complexity of the hard-wired construction. All the capacitors are oil and paper types, the switches are all 1950s-era NOS, and chokes are used in the signal path rather than resistors. Power-supply rectification is performed with the classic 5AR4 diode tube; and note the careful spacing of the signal-carrying conductors.
</p>
[Source: http://www.stereophile.com/content/coffman-labs-“hand-built-portland”]