Electrodyne 511 Electrodyne 511 two-band inductor EQ: 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... MSRP: Was: Now: €1,439.00 (Inc. Tax) MSRP: Was: Now: €1,209.24 (Ex. Tax) Add to Cart