TL Audio Indigo 2051 mic pre
I think the INDIGO was the solid state series of
They stopped production of INDIGO's preamps eq's etc. after one year or so.
Can't remember more.
The "Crimson" series was the solid state version of the Indigo series. And that's it !
Is it any good ? Well, yes, some of it is considering its cost. If buying say an EQ is an upgrade from what you've got, buy it 2nd hand and you're laughing !