This is a pair of Gates broadcast discrete transistor mic pres. These microphone preamplifiers were used in Gates radio boards and have transformer balanced inputs and outputs. They have 37 dB of gain and I racked them with a level control ranging from 20-37db. The position of the level control is immediately after the input transformer so there is no need for a pad on the input unless you are overloading the transformer! These units were re-capped and wired for 150 ohms in and 600 ohms out. This was a super simple and clean rack job so they only have XLR in and out, level control, and a power switch for the outboard +30v power supply.
Archive for the Restored Category
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.
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.