Drawmer 1962 Digital Vacuum Tube Pre-Amplifier - Manual (Page 17)

1962 OPERATORS’ MANUAL 13
occur, but as the signal level falls below 0dB, low level, low frequency
transients will be enhanced proportionally.
High Enhance:
This continually variable control applies enhancement by increasing the
amount of harmonic energy already present in high-frequency, transient
signals. The control should be adjusted until the LED above illuminates
periodically. Used carefully, High Enhance will increase the subjective
definition of a sound without increasing its level by any significant degree.
In: Activates the Low and High Enhance circuitry and lights the LED.
TUBE DRIVE
Each channel contains a specially designed tube circuit with variable
drive, designed to emulate the classic tube sound of vintage equipment
in a fully controllable manner.
The tube drive control comes before the Peak Limiter in
the signal side chain, so it is feasible that using high
settings of tube drive on certain types of programme
material may cause the signal level fed into the Limiter
stage to increase. This will result in increased limiter activity.
Tube Drive:
A continually variable control that regulates the amount of tube colouration.
Note that even at the control’s most counter-clockwise position some tube
warmth will be added. To disable any tube effect fully, the section must be
disabled using the push button switch.
In:
Switches the tube circuitry into the signal path and illuminates the status
LED.
CHANNEL OUTPUT
Level: The Level control regulates the signal
level available at the rear panel Channel Output XLR.
The gain range is from -15dB to +20dB, and the
output level is shown on the 8-segment meter placed
directly above the Level control.
Normally, the signals fed to the Mix output stage (and
hence to the digital output), are independent of the
channel level control settings. This is the optimal and factory configuration.
There is an option (although less desirable) for the Mix section and the Digital
Source Chs (channels) feed to be made post-level control by changing two
PCB jumpers inside the unit (one per channel). This is not the best option
for several reasons:
1) Digital output noise will be increased by up to 4dB.