The KB GR40 is a large wooden table radio made by Kolster-Brandes in Britain around 1951. It has six valves and a superheterodyne circuit with an RF stage. Its ten wave ranges cover medium wave, long wave and short wave, including several shortwave bandspread ranges.
It is an AC mains set, with voltage settings for 100–120 V, 200–220 V and 230–250 V. The related GR40T is an export version with different waveband coverage.
SERVICE MANUAL PREVIEW
The Trader service sheet for the Kolster-Brandes GR40, the 10-band superhet with seven band-spread ranges, is available to members. Here's a taste of what's inside.
These pictures are faded on purpose, just for this preview. Members get the complete service sheet, unfaded, to view and download.
The service sheet includes:
- The full circuit diagram, with all seven band-spread coils
- Component values, with where to find each one on the chassis
- Valve analysis, with the voltages and currents
- Diagrams of the five wave-band switch units, with a table of switch positions
- How to dismantle the set
- Step by step circuit alignment for every range
- How to fit a new drive cord
- Drawings of the top and underside of the chassis
