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Pete's Place Audio "Electrodyne 511" 500-Series EQ - Used  From Pete's Place

The Electrodyne 511 is a 500-series two band discrete active-inductor equalizer.  


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What We Think

This EQ is a sleeping giant. Yes, it's only got two EQ bands on board, but if you can't get what you need with these two bands, you need to go back and just re-record the track. There's a HUGE amount of horsepower under the hood of this EQ that is available when you need it, but it's equally suited to subtle shaping. 

No doubt about it - when you pass a signal through this box even with the knobs zero'ed out, what comes out the other side is bigger, more massive and yet fully under control. This is glue in the form of EQ, and it keeps me from having to rely quite as much on compression later on down the signal chain. This on its own would be enough to seal the deal for me, but when I started to tweak the EQ on the 511, I really got a sense for the power that this unit wields. 

This is not a tool for the tweakers - it is the broad-stroke EQ to rule all broad-stroke EQ's. That means you can be gentle when you need to, and when you want to drastically manipulate the signal you can do so without ruining what was originally captured.

Use this eq when tracking guitars, bass, keys, horns, vocals, or nearly anything you're working with. and then make sure you come back with it on your master bus. It's easy to land on great settings with this EQ, so you won't waste time second guessing what you've just done.

Manufacturer's Description from Pete's Place

The Electrodyne 511 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. 

Pete's Place Audio


  • 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.