LOMO UP27 – Racking

Lomo UP27 / ЛОМО УП-27 racking project. Recently bought four UP27 microphone preamps + PSU unit. Documentation so far:

The 6HE 19″ case has been bought here. Their website doesn’t list a 6HE model at the moment but if you ask they’ll be able to deliver. The base plate also comes from this shop. Side panels are regular 6HE eurorack rack-ears put in a 90 degree angle screwed on the base-plate (see 3rd pic). On that eurorack rails were screwed (see first pic).

Aluminum bars hold connectors in place. This way the preamps can be removed by pulling.

Original Lomo PSU schematic and two versions of the UP27 schematics:

LOMO PSU schematic

First test:
– one unit completely non-working
– one unit having issues
– two units working properly
Because I’m not a tube expert all units have been checked and restored by a professional.
Both recordings have been mad after this restoration: