Components are placed in Bakelite/ Metal Cabinets & connections are brought out at 4 mm Terminals/Sockets.
| 200170 | PN Junction Diode on Board (IN 34 or equivalent). |
| 200171 | Zener Diode (8.2V or any other value) on board. |
| 200172 | PNP/ NPN Transistor on Board |
| 200173 | LDR (5mm on board) |
| 200174 | Thermistor on board (Any valve from 100 ohm-100K ohm). |
| 200175 | Diode valve (6H6) on board. |
| 200176 | Diode valve (6AL5) on board. |
| 200177 | Triode valve (6J5/6C5) on board. |
| 200178 | Triode valve (ECC 82) on board. |
| 200179 | Tetrode/Pentode Valve (6SJ7) on board. |
| 200180 | Thyratron Valve (2D21) on Board. |
| 200181 | Thyratron Valve (2051) on Board. |
| 200182 | Photo Cell Selenium type mounted in the box. |
| 200183 | Photo Cell Vacuum type mounted in the wooden box with aperture for light. |
