Fredenstein F601A User Manual

F601A

MIC-PRE

Operating Manual

Fredenstein F601A Microphone Preamplifier

The F601A is a high performance professional microphone preamplifier. It's innovative Zero­Negative-Feedback design improves low frequency and transient reproduction dramatically.
In addition, the F601A delivers detailed high frequency information without being harsh, a truly
silky and smooth experience. It's fully discrete Class-A gain stage with its high performance
Lundahl LL1578XL input and LL1517 output transformers outperforms “classic” microphone
preamplifiers by a wide margin. To give engineers a greater control of the tonality, both
transformers are individually switchable. Combined with the F601's very low noise the F601A will
provide exceptional sonic results. If used in a Fredenstein Bento D rack, all parameters will be
displayed on the Bento LCD screen.
As all Fredenstein products, the F601 is designed by a German-American team and manufactured in
Taiwan.

Installation:

Please power down your rack or box first before inserting the F601A. The power requirements are
maximum +/-16V, +/-150mA. In case you don't use a Fredenstein Bento, please make sure your box
or rack can support the current. Please consult your third party documentation in case of any doubt.

Overview:

Output Level Indicator

0VU = +4dBu

Clip Indicator

Threshold +24 dBu

Rotary Controls:

GAIN : Gain Control, maximum +78 dB

Switches:
INPUT : activates the input transformer
OUTPUT : activates the output transformer
POL : Output Polarity
LOW CUT : 60Hz High Pass Filter
P48 : +48 Volt Phantom Power
LOW-Z : Changes the input impedance to 300

Ohms

Connector:

DI : High impedance input for instruments

: accepts balanced or unbalanced signals

TS or TRS

Fredenstein F601A Manual V1.2 July 18, 2014 Page 1