The Electrodyne Audio 2501 (Two Electrodyne 501 Preamps/D.I. in a 19" chassis) is a Dual Mono Microphone Pre Amplifier that was designed for both Professionals and Home Recording Artists.
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.
After the serious demand for the 501 Electrodynes' 500 Series Preamp, we found that not all people in the recording industry want 500 Series and many are much more attracted to 19" Rack Mounted gear.
Most companies will introduce 19'' rack mount products first, and if they have any success, only then they will dive into the 500 Series Format. We have done just the opposite and taken the 500 Series Electrodyne products to Dual Mono 19' rack mounted versions with all the same tone and features,. Instead of sharing the limited resources of many 500 "lunchbox" power supplies, we paired them with their own powerful dedicated supply modules ensuring top performance under any conditions. So, the qualities you fell in love with using the Electrodyne 501 Preamp (and 511 EQ) are now even more accessible.
The 2501 is a 100% original Electrodyne design, not a clone or a copy. Electrodyne products are still made here in the USA by Electrodyne Audio LLC, handcrafted the same as they were in the 1960's and 1970's with the same proud workmanship and design that made them collectable classics then, and today over 60 years later.
All discrete transistor, transformer input/output designCustom wound Input TransformersCustom wound Output transformers2db per step Gain Control for easy recallContinuously variable Output Level controlPhase Reverse Switch48v Phantom SwitchActive Class-A Fet DIDual Impedance Selector SwitchOiginal design knobs and control levers (original manufacturer)Rugged powder coated steel chassisHeavy-gauge Anodized Aluminum Face PlateAll XLR I/OOn/Off Power SwitchRed LED Power Indicator
Maximum Gain: 68db. Adjustable over 50db in 2db steps with two ranges using 20db pad.Output level control: Infinitely adjustable from 0 (off) to +6db over unity.Input impedance: Microphone, 50 / 200 ohms selectable. DI, over 7 megohms.Output impedance: 150 ohmsDistortion: 0.02%typical over entire gain range.Maximum output: +30db at less than 0.8%thd. (+29.5db at 0.06%thd)Frequency response: +/- 0.25db, 10hz to 60khz.Signal to noise: -80db typ, -60db at absolute maximum gain.Clip indicator: Monitors all three amp stages and illuminates when any stage is 3db from clip.
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