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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.
Specifications:
- 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 ohms
- Distortion: 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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