Supply Unit Rectifier no. 7 Mk 2

This unit was used to feed DC 80-80V line current to teletype machines.
I use it as a supply unit for battery-driven radio's, as the voltages can be varied by adjusting the input voltage, slightly.

Input Output Combined
100 / 240 V AC - 50 Hz 70 / 100 V  DC  0 / 30 mA 140 / 200 V  DC  0 / 30 mA
  70 / 100 V  DC  0 / 30 mA
or: 35 /   40 V  AC  0 / 40 mA  
12 V DC 11.5 / 14 V  DC 200 / 400 mA  

This sturdy wooden box contains a handy supply unit for use with battery driven equipment.
This is what it is called.
The panel made of thick pertinax, still oozing formaldehyde.

Two vibrators are supplied: one working and one spare.

12 Volt is connected to the two screw connectors, bottom left.

The toggle switch switches between AC or DC power.

At the right the following voltages can be obtained:
2 x 80 or 1 x 160 VDC at 30 mA;
40 VAC at 30 mA;
12 VDC at 300 mA

In detail.
The famous red control light.

A view at the fuse. This is a insulated tube through which a resistance wire is put. No spare fuses needed! On the lid of the cabinet a spool with fuse wire is supplied, see below. Nifty system! Could have been a Dutch invention.

Output terminals.
High Voltages can be added.
Various AC sources could be used. On the left side is a correction circuit for + or - 10 Volt. So input voltages from 100 to 240 Volts are usable. 
Inside a large selenium rectifier. The construction is very strong and this apparatus will outlive many man.
In the lid a schematic diagram as well as a spool of resistance wire is supplied.