Fredenstein F609 TUBE User manual

F609 TUBE
MIC-PRE
Operating Manual

Fredenstein F609 Tube Microp one Preamplifier
The F609 is a professional tube microphone preamplifier, using two double-triodes, one ECC802
and one ECC803 , in a single 500 series rack module. It provides an +160V power-supply to avoid
starving the tubes. The F609 uses high quality American made input and output transformers.
Additional features are: 20db Pad, polarity control, phantom power, a two stage low-cut filter, and a
standby mode to preserve the tubes if not in use. The sound is very smooth with a big, but well
defined, low-end. The output level control allows to change the characteristic of the amp and to run
the first stages all the way up to distortion.
As all Fredenstein products, the F609 is designed by a German-American team and manufactured in
Taiwan.
Overview:
Output Level Indicator
0VU = +4dBu
Clip Indicator
Threshold +24 dBu
Rotary Controls:
GAIN : Gain Control, maximum +70 dB
OUTPUT : Output Level, -20dB to 0 dB
Switc es:
PAD : -20dB attenuator
POL : Output Polarity
P48 : +48 Volt Phantom Power
L-CUT : High Pass Filter 50 or 100Hz
ON : Power on or tandby
Connector s :
DI : High impedance input for
instruments accepts
unbalanced signals
Fredenstein F609 Manual V1.1 Nov. 10, 2014 Page 1

Fredenstein F609 Tube Microp one Preamplifier
Installation:
Please power down your rack or box first before inserting t e F609 . T e power requirements
are maximum +/-16V, +/-250mA. In case you don't use a Fredenstein Bento, please make sure
your box or rack can support t e current. Please consult your t ird party documentation in
case of any doubt.
Gain Control:
Microphone Preamplifier Gain Control, minimum +34dB, maximum +70dB.
Output Control:
Range -20dB to 0db. The 0db position is the normal linear setting.
PAD – Input Attenuator
Atcivating PAD attenuates the microphone signal by 20dB. PAD does not change the DI level.
POL – Polarity Control:
etting the signal polarity, when turned on, the signal is inverted.
Low Cut – Hig Pass Filter:
Two stage low-cut filter, 50Hz or 100Hz
P48 P antom Power:
Most FET condenser microphones as well as some other microphones with built-in amplifiers
require +48V Phantom Power. etting the P48 switch to the right enables +48V through the
balanced microphone line. Please check your microphone documentation if you are not 100% sure.
Enabling P48 on microphones not designed for P48 might cause severe damage.
ON – Standby Switc :
Turns the F609 on (switch in upper position, green LED lit) or activates standby mode (switch in
lower position, yellow LED lit). In standby mode, the high voltage supply, the tube heaters and the
VU meter back-light are turned off. Please allow 30 seconds for the amp to be fully functional after
turning it on.
DI – Direct Input:
The most common use for the DI input is to connect instruments like guitars directly to the F609.
The input impedance is greater than 500 KOhms to insure compatibility with most instrument
pickups. After inserting an unbalanced (T , Tip- leeve) plug, the balanced microphone input
through the box or rack is automatically disabled.
Please note:
As a pure analog product, the F609 does not support digital read-out on Bento D displays.
Fredenstein F609 Manual V1.1 Nov. 10, 2014 Page 2

Fredenstein F609 Tube Microp one Preamplifier
Tec nical Data:
Frequency Response : 20 Hz – 20,000 Hz, +/- 1dB
Distortion : < 0.1%
Input Noise : < -127 dB
Input Impedance : > 1200 Ohms
Max. Input Level : + 12 dBu
Output Impedance : 200 Ohms
Max. Output Level : + 26 dBu
Clip Indicator : + 24 dBu
Input Attenuator PAD : - 20 dB
High Pass Filter : 50 Hz or 100Hz (switchable)
Fredenstein F609 Manual V1.1 Nov. 10, 2014 Page 3

Contact Info:
Fredenstein Professional Audio
by Orion Communication
7F-1, No. 582, Ruei Guang Rd.
Neihu District
Taipei 114
Taiwan
Phone : + 886-2-2657-2618
Email : [email protected]
Web : www.fredenstein.com