Virtual Valve Museum
Virtual Valve Museum | search: (use * for wildcard)
About the museumMuseum exhibitsUpdates, new exhibits etc.EquipmentSupporters
*DocumentsValves wanted!Valves for sale or for tradeLinks to other sites, suppliers etc.

Stabilovolt STV280/40 dismantled

This device is a gas-filled voltage stabiliser with multiple anodes. It can thus produce multiple outputs, typically for the STV280/40 these are 280V, 210V, 140V and 70V, representing 70V per section.

WIre connection
The outer connecton can be seen here. It connects to one of the pins in the base via a wire to the glass tube that can be seen in the centre of the photo.

Note that the CV data (STV280/40 = CV1068) lists the electrodes as cathode and anode 1 thru 4, but the Stabilovolt literature lists these as -C, 0, +B1, +B2 and +B3. The same literature shows the device in circuit with the cathode at -70V, anode 1 at 0V, 2 @ 140V and 3 @ 210V. This shows the flexibility of the device.

First shell
The outer electrode (Cathode, or -C) removed. At the bottom of the picture can be seen the wire connecting the next electrode (Anode 1, or "0") to the base.
Second shell
Anode 1 removed revealing anode 2 (or +B1). The two wires that can be seen are held in the ceramic base to hold the electrode rigid. This is common of the construction of this device.

Third shell
Anode 2 removed revealing anode 3 (or +B2). Again the wire connecting the remaining anode to the base can be seen at the bottom of the picture.

Fourth shell

Anode 3 removed, revealing anode 4 (or +B3). This inner anode is now all that is left.

Final wire connection
The connecting wire for the inner anode is taken through the top and down an insulated tube inside.
Fifth shell

The parts
Here are all the component parts, except the base and glass! Dimensions of the various anodes are as follows:

Cathode (-C) 47mm tall by 39mm inside diameter
Anode 1 (0) 37mm tall by 32mm inside diameter
Anode 2 (+B1) 33mm tall by 25mm inside diameter
Anode 3 (+B2) 29mm tall by 18mm inside diameter
Anode 4 (+B3) 25mm tall by 11mm inside diameter

This file was last modified 15:19:44, Tuesday September 02, 2014