VNE Vacuum Tube Compression Amplifier
HAZELRIGG INDUSTRIES
10
Power
The VNE is designed to operate from 120 or 220-240 volt, 50/60 Hz power. The unit will be
shipped wired for the voltage specified in the order, but may be changed in the field if necessary
(Call the factory for detailed instructions). The ground pin of the power cord is internally
connected to the chassis. This configuration is standard in professional equipment and is required
by most electrical codes. A grounding screw is provided on the back panel for installations that
use separate chassis grounding. If ground loop hum is detected, a careful check of the studio
grounding scheme is needed. The VNE is less susceptible to grounding problems than many
studio devices.
Connections (see Figure 1)
The INPUT connector is XLR-3 female wired with pin 1 ground, pin 2 “+” or “high,” and pin 3
“-” or “low.” The input matches 600 ohm (nominal) line level (+4dBm nominal) balanced or
unbalanced signals. The input uses a top-quality Jensen line bridging transformer.
The OUTPUT connector is XLR-3 male wired with pin 1 ground, pin 2 “+” or “high,” and pin 3
“-” or “low.” The VNE is optimized for feeding balanced bridging inputs (Virtually all modern
audio equipment has bridging inputs). The output is transformer-balanced.
The “GND” terminal is for use when an external grounding scheme is utilized.
The Fuse is a 5mm x 20mm 1 amp for 115 VAC operation, and 0.5 amp for 220-240 volts.
The AC input connector is used with the mating line cord (supplied). For 115 VAC operation, this
cord is a Belden 17250 or equivalent.
The unit does not utilize any RFI filtering, and no RFI has been experienced, even when the VNE
is operated in close proximity to AM, FM, and TV broadcast transmitters.