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Electrodyne

The Electrodyne 501 is a 
two-stage, discrete transistor, transformer-coupled preamp with active 
DI based primarily on the modules found in the classic 1608 console. 
Each amp stage is individually optimized for peak performance using 
detailed Electrodyne factory engineering notes and select high 
performance components identical to the originals. In fact, the 501’s 
transformers are made by Electrodyne’s original supplier to exacting 
factory specifications. 
 
The new preamp’s active DI circuit presents an almost immeasurable load 
(over six megohms!) to sensitive musical instrument outputs allowing 
incredibly accurate capture of the instrument’s true tone. Furthermore, 
the output of the DI circuit is designed to directly connect and 
interact with the mic input transformer to permit an extremely broad 
spectrum of tonal options. 
 
The faceplate of the Electrodyne 501 features a large rotary gain 
control offering up to 68dB of gain – adjustable over 50dB in 2dB steps 
with two ranges via a 20dB pad switch – and a smaller output level pot 
infinitely adjustable from 0 (off) to +6dB over unity. Additional 
switches for impedance selection (50 or 200 ohms), phase reverse, +48V 
phantom power and DI (with 1/4" input jack) are also present, as well as
 a clip LED that monitors all three amp stages and illuminates when any 
stage is 3dB from clipping. Specifications <ul><li>Maximum Gain: 68db. Adjustable over 50db in 2db steps with two ranges using 20db pad. </li><li>Output level control: Infinitely adjustable from 0 (off) to +6db over unity. </li><li>Input impedance: Microphone, 50 / 200 ohms selectable. DI, over 7 megohms. </li><li>Output impedance: 150 ohms </li><li>Distortion: 0.02%typical over entire gain range. </li><li>Maximum output: +30db at less than 0.8%thd. (+29.5db at 0.06%thd) </li><li>Frequency response: +/- 0.25db, 10hz to 60khz. </li><li>Signal to noise: -80db typ, -60db at absolute maximum gain. </li><li>Clip indicator: Monitors all three amp stages and illuminates when any stage is 3db from clip. </li></ul>

Electrodyne 501 Preamp
Discrete two-stage studio preamp for 500 Series

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The Electrodyne 511 is a classic
 two-band, discrete transistor, reciprocal, active inductor-based 
equalizer using late-’60s/early-’70s design technology. As with the 501,
 the 511’s custom inductors and output transformer are made by 
Electrodyne’s original provider to strict factory tolerances as small as
 two percent. This affords a consistent EQ performance and repeatability
 from channel to channel that was simply not possible in the 1960s. 
Smooth performance and EQ response from minimum to maximum gain at all 
frequencies provides unusually broad sonic and tonal options not 
experienced since the 1970s. 
 
The module’s faceplate sports twin large rotary EQ controls each 
offering ±12dB of boost and cut with four selectable frequencies per 
band (LF: 40, 100, 250 and 500Hz / HF: 1.5, 3, 5 and 10kHz). Shelving is
 available on all frequencies, with peaking offered at 250 and 500Hz in 
the LF band and 1.5, 3 and 5kHz in the HF band. An EQ in/out switch with
 accompanying LED rounds out the front panel feature set. Specifications <ul><li>Input: Active balanced discrete transistor impedance converter. </li><li>Output impedance: 150 ohms </li><li>+/-12 db gain range: Equalize or Attenuate </li><li>4 frequencies selectable per band. LF: 40, 100, 250, 500hz. HF: 1.5k, 3k, 5k, 10k. </li><li>Peak/Shelf function on each band. Shelving at all frequencies, Peaking at 250, 500, 1.5k, 3k and 5k. </li><li>Distortion: 0.03%typical. </li><li>Maximum output: +30db at less than 0.8%thd. (+29.5db at 0.06%thd) </li><li>Frequency response: +/- 0.25db, 10hz to 70khz typical. </li><li>Signal to noise: -85db typ.</li></ul>

Electrodyne 511 Equalizer
Two-band inductor EQ in the 500 Series format

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Electrodyne 501 Preamp (Demo Deal)
Discrete two-stage studio preamp for 500 Series

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