Fredenstein F609 User Manual

F609 TUBE

MIC-PRE

Operating Manual

Fredenstein F609 Tube Microphone Preamplifier

The F609 is a professional tube microphone preamplifier, using two double-triodes, one ECC802S
and one ECC803S, 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

Switches:
PAD : -20dB attenuator
POL : Output Polarity
P48 : +48 Volt Phantom Power
L-CUT : High Pass Filter 50 or 100Hz
ON : Power on or Standby

Connector s :

DI : High impedance input for

instruments accepts
unbalanced signals

Fredenstein F609 Manual V1.1 Nov. 10, 2014 Page 1