KB model LR10 valve radio

KB LR10 radio. Square wooden cabinet with a patterned speaker cloth on the left, a large black tuning scale on the right and four knobs on the lower panel

The KB LR10 is a British valve radio manufactured by Kolster-Brandes (KB) in 1954. It’s a classic example of a mid-1950s domestic radio, dating from the period before transistor radios became commonplace. The LR10 uses a conventional five-valve circuit, with a dedicated output valve driving the speaker. Its wooden cabinet was typical of the era, when radios were often designed as pieces of household furniture.

The five valves are 6BE6, 6BA6, 6AT6, 6AQ5 and 6X5GT.

SERVICE MANUAL PREVIEW

The Trader service sheet for the Kolster-Brandes LR10 is available to members. Here's a taste of what's inside.

First page of the Trader service sheet for the Kolster-Brandes LR10, with a photo of the radio
Front page
Circuit diagram of the Kolster-Brandes LR10
Circuit diagram
Plan view of the Kolster-Brandes LR10 chassis showing the RF and oscillator adjustments
Plan view of the chassis
Under view of the Kolster-Brandes LR10 chassis showing the internal speaker switch
Under-chassis view

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
  • Component values, with where to find each one on the chassis
  • Valve analysis, with the voltages and currents
  • Diagram of the waveband switch unit, with a table of switch positions
  • How to fit a new drive cord
  • Step by step circuit alignment
  • Photos of the top and underneath of the chassis

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