D.W. FEARN
VT-7 Compression Amplifier
29
Gain Reduction meter calibration
The adjustments for the VU meter “0” calibration in the “GR” position are located on the
PWM board. Contact the factory for complete adjustment instructions. Note that the meter
calibration can be off but the VT-7 will continue to operate normally otherwise. Some drift-
ing of this adjustment is normal, and the reading will change as the VT-7 warms up over a
period of an hour or so.
Alignment
There are many alignment adjustments in the VT-7, many of which that require test equip-
ment that is more sophisticated than is available in many studios. Notably, an oscilloscope
with a calibrated time base that can accurately resolve 40nS is required.
The circuitry of the VT-7 is quite stable and routine alignment is usually not required.
If the VT-7 requires alignment, contact the factory for detailed instructions.
Troubleshooting
Most problems will be traced to defective vacuum tubes. However, if normal tests do not eas-
ily reveal the problem, feel free to call the factory for assistance. If you lack access to a qual-
ified service technician with vacuum tube equipment repair experience, you may return the
VT-7 to the factory for repair. Call first, however, for shipping information.
Warranty Repair
If the VT-7 should develop a problem during the five-year warranty period, call the factory for
return shipping instructions. We will repair and return your VT-7 quickly. Note that the war-
ranty does not cover vacuum tubes, which must be periodically replaced.
