Speck Electronics LiLo - Manual (Page 29)

Chapter 3 Operation Section 25
The LiLo may be ordered with a choice of two types of VU meters: A dual
LED style, or dual analog style. Both types are calibrated to indicate 0VU for
an output level of +4dBu.
LED Style
The LED style meter pod uses two 18 segment LED arrays and are sensitive
from -31db to +5db. This circuit is designed to approximate the ballistics of a
"taut band" analog style VU meter.
Analog Style
The Analog style meter pod uses two high quality illuminated Sifam VU
meters.
Replacing lamps on the analog meter requires removing the cover of the VU
pod by removing the (6) phillips screws. After the cover has been removed,
carefully rotate the copper tab on the rear of the meter until it is clear of the
lamp. Remove the old lamp and replace with a flange base, #7332, 5 volt
incandescent lamp.
VU Meters