Premium two-stage discrete transistor preamp with transformer-balanced I/O, based on original 1969/70 Electrodyne console design.

Excellent condition, fully functional, original package. 

I have two units available – see my other listing.

Serial number EDP 000761

The Electrodyne 501 is a two stage discrete transistor, transformer coupled preamp with active DI, using classic 1969 / 1970 design technology. Each amp stage is individually optimized for peak performance using Electrodyne factory engineering notes and selected high performance components identical to the originals. The transformers are made by Electrodyne’s original manufacturer to exacting factory specifications. The active DI circuit presents an almost immeasurable load to sensitive musical instrument outputs allowing incredibly accurate capture of the instruments true tone. The output of the DI circuit is designed to directly connect and interact with the mic input transformer to allow maximum tone options. 

• Format 500 Series module
• Up to 68 dB gain (2 dB stepped, with -20 dB pad)
• Continuously variable output level
• Active DI input (>7 MΩ) – ideal for guitar and bass
• Selectable input impedance: 50 / 200 Ω
• Maximum output: +30 dBu
• THD: approx. 0.02%
• Frequency response: 10 Hz – 60 kHz

Comparable in quality and class to classic designs from Neve, API, and Chandler.