Owner`s manual

High-Level Hookup
The auxiliary inputs are high impedance. Thus you may use any input as a source
for the MP3. If you are using a low impedance source, a low impedance
termination is recommended for better sound. A single-ended source can also be
used, by applying the signal between either pin two or pin three of the input
XLR, and ground. The unused input (pin three or pin two, respectively), may
have to be shorted out to prevent noise. Pin two of all the XLR inputs is the
non-inverting input, per industry standard.
The tape outputs are high impedance. Use a high quality cable for best results
and keep the cable as short as possible. The minimum drive impedance is
20Kohms. The tape 2 output is inverted while tape 1 is non-inverted.
The tape monitors are a single-ended, non-inverting, high impedance input.
NOTES ON TUBES
1) The 12AT7s in the rear left of the board are the most critical for low noise
phono operation.
2) The constant current source tube The 7th 12AT7 by itself in the rear) is
outside of the signal path.
3) Matched sections in the 12AU7s of the high level section will
reduce DC offset during operation of the front panel GAIN TRIM controls.
4) Tube damping rings are recommended.
5) Do not remove tubes while unit is operating. Hazardous or lethal voltages
are present!
6) NEVER use Tweek on vacuum tubes.
7) Long live analog!
TROUBLESHOOTING TIPS
Bottom front panel LED won't light up: Check the rear panel AC connector and
verify that the power cord is plugged in. If so, the internal 1.5Amp SLOW BLOW
(.75A if 235 Volts) fuse may be blown.
Buzz, hum and/or RF interference: Make sure that the power cord is plugged into
a properly grounded outlet and that no other equipment in the system is
grounded (resulting in a ground loop). Sometimes RF can get into the phonograph
through poorly shielded wiring in or from the tone arm. This is common with
modern straight-tracking arms. Buzz can also occur if the input of the
amplifier is not properly balanced. This can occur if the amplifier has an RF
filter at its input that is only active on the non-inverting input. There are
quite a few transistor amps with balanced inputs that are set up this way.
Distortion: Check the output tube (6SN7) and the associated 12AU7 for defects.
Also pin 3 or pin 2 of the XLR may be shorted to ground.
Both channels dead, unit lights up: There is a fuse located on the rear right
side edge of the circuit board (as you face the front of the unit). Replace
with the same type slow-blow fuse (.75 Amp for 117 Volt units, .35 Amp for 230
Volt units). If you are not qualified, do not remove the cover. Hazardous or
lethal voltages are present with the cover removed. Refer servicing to
qualified service personnel.