Brinkmann Audio Edison MKII
Hybrid phono preamplifier with three inputs, switchable input transformers and individually adjustable gain and impedance settings.
Description
The Edison MKII is a phono preamplifier from Brinkmann Audio, designed alongside the Marconi line preamplifier, with which it shares an aesthetic and sonic kinship. It is a hybrid phono stage, combining valves and semiconductor components, intended to amplify and equalise the signal from a cartridge before sending it on to a line preamplifier or an integrated amplifier.
The unit offers three separate phono inputs, each followed by a switchable 1:1 input transformer. The loading impedance can be adjusted independently for each input across twelve positions, between 47 ohms and 47 kOhms, allowing the unit to be precisely matched to different types of cartridge. Gain is also set input by input, across sixteen positions, by means of a front-panel dial; the gain, impedance and transformer routing settings (active or bypassed) are stored in an EPROM chip when switching inputs. The first gain stage is built around bipolar transistors selected for their sonic qualities, while the RIAA equalisation curve is applied between two subsequent valve stages, with the equalisation network split between local feedback and the plate load of the first valve stage. A third valve stage provides the phase inversion required for the balanced outputs. Equalisation is switchable between RIAA and IEC curves.
This phono preamplifier is aimed at users with several turntables or wishing to compare several cartridges on the same system, thanks to its three independent inputs and their stored settings. Its hybrid design and fine impedance and gain adjustments make it a tool designed to make the most of a range of cartridges, including demanding ones.
What to check before buying used
On this hybrid phono stage, the output valves should be tested to rule out any microphony or excessive noise, while the proper functioning of the EPROM memory for the settings (gain, impedance, transformer routing) is worth checking on each of the three inputs. The switchable input transformers and their selector contacts are also sensitive points to check, as is the absence of hum or background noise once the unit has warmed up.
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