Archive for passive

Transformer Saturation Box w/UTC & Davens

Posted in New Build with tags , , , , , , , , on June 29, 2013 by AnalogAudioRepair

This is a neat box I built for Joel Hamilton at Studio G Brooklyn.  It is a simple circuit consisting of UTC transformers and Daven attenuators.  The idea is that a hot audio signal can be sent in, saturating the input transformer.  It is then attenuated by the Daven and sent back out through a second transformer.  Joel likes to use it on inserts of the SSL so he can pump a track through a high output compressor like a Sta-Level or Collins 26U and then get some extra transformer tone before returning it at a reasonable level to the board.  Since it is built into a 3 space rack case, we decided to get extra large knobs and dial plates for the Davens for a great vintage “black box” look!

Chassis drilled full of holes.

Chassis drilled full of holes.

Inside

Inside

Close Up

Close Up

Front panel

Front panel

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Allison Labs 2ABR

Posted in Modded with tags , , , , , , , , on October 15, 2012 by AnalogAudioRepair

This is a vintage Allison Labs passive filter / equalizer with custom mods.  It has UTC input and output transformers and XLR connectors added as well.

Universal Audio 1108 & 508

Posted in Racked Modules, Restored with tags , , , , , , , , , , , , , on October 7, 2012 by AnalogAudioRepair

This is a set of vintage Universal Audio (UA / Urei) 1108 discrete transistor microphone preamplifiers with matching 508 passive equalizers.  The preamps are transformer in and out and sound amazing.  The EQs use passive capacitors and inductors for simple but smooth EQ.  Restored and racked with phantom power and gain pots.