Electrodyne Announces 2501 Preamp and 2511 EQ

Back in 2009 Electrodyne and Pete’s Palace Audio team (known for their boutique audio offerings) teamed up to produce the original 500 Series 501 preamp and 511 EQ.

Now almost five years later the two have come together once again to produce dual-mono versions of their popular vintage-designed preamp and EQ with the Electrodyne 2501 and Electrodyne 2511. What original, discrete circuitry could possibly await us?

The Electrodyne 2501 preamp is available now for $2,095.00 MSRP, with the 2511 EQ available now for $2,300.00 MSRP.

Here is more from Pete’s Place Audio:

Electrodyne 2511 two-band inductor eq:

Among all other components, the custom inductors and output transformers will give a particular flavor to this EQ.

Electrodyne 2511 two-band inductor EQ:
The Electrodyne 2511 is a classic two-band discrete transistor reciprocal active inductor equalizer using 1969 / 1970 design technology. The custom inductors and output transformer are made by Electrodyne’s original maker, to strict factory manufacturing tolerances as small as 2%. This allows consistent eq performance and repeatability from channel to channel that was not possible in the 60,s. Smooth performance and eq response from minimum to maximum gain at all frequencies, provides unusually broad sonic and tonal options not experienced since the 1970,s.

• Input: Active balanced discrete transistor impedance converter.
• Output impedance: 150 ohms
• +/-12 db gain range: Equalize or Attenuate
• 4 frequencies selectable per band. LF: 40, 100, 250, 500hz. HF: 1.5k, 3k, 5k, 10k
• Peak/Shelf function on each band. Shelving at all frequencies, Peaking at 250, 500, 1.5k, 3k and 5k
• Distortion: 0.03%typical
• Maximum output: +30db at less than 0.8%thd. (+29.5db at 0.06%thd)
• Frequency response: +/- 0.25db, 10hz to 70khz typical.
• Signal to noise: -85db typ.

Electrodyne 2501 discrete two stage studio preamp:

As impressive as the transformer-coupled pres are, the DI on the 2501 may be even more so.

The Electrodyne 2501 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.

• 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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