Archive for transformer

DuKane 2A81 Compressor Mods

Posted in Modded with tags , , , , , , , , on November 28, 2012 by AnalogAudioRepair

Here are a pair of vintage DuKane compressor/limiters.  They use an all discrete transistor circuit path with a FET for gain control.  They come stock with a (useless) noise gate, two inputs, and some controls on the rear panel.  These mods remove the noise gate, move the ratio and bypass to the front, and add release time settings.  Everything gets cleaned up and boards are re-capped if needed.  The results?  “A super smash box” according to one user!

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Altec Coke Bottle Mic PSU

Posted in Repaired with tags , , , , , , on November 28, 2012 by AnalogAudioRepair

A client sent me a vintage Altec M11 “Coke Bottle” tube microphone that needed re-capping.  The 518A power supply has a lot of caps, but the new ones are much smaller.  After re-capping and a new tube the mic sounds great!

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.

Yamaha PM1000

Posted in Modded, Racked Modules with tags , , , , , , , , , , , on September 19, 2012 by AnalogAudioRepair

Yamaha PM1000 discrete transistor console strips cut down, recapped, modded, and racked as mic pres with EQ.

GE 4BA1 Preamp

Posted in Restored with tags , , , , , , , on August 5, 2012 by AnalogAudioRepair

Vintage GE 4BA1 vacuum tube mic preamp.  Recapped (electrolytics inside the old can), re-tubed, and wired up with a restored GenRad regulated power supply.

Trident FlexiMix Board

Posted in Restored with tags , , , , , , , , , , , , on August 5, 2012 by AnalogAudioRepair

Trident FlexiMix console 10x2x2.  Restored and sold.  Note the three types of EQ modules.