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Cairn K5 / K05 5-Channel Hi-fi Power Amplifier


Cairn K05 A Big Motorhome Beresford TC7510 DAC Void Infinite 8 Wurlitzer Lyric Jukebox Frank Zappa Mixer VAC Valve Amplifier
Cairn K05 A Big Motorhome Beresford DAC Void Infinite 8 Wurlitzer Jukebox Frank Zappa's Mixer VAC Valve Amplifier

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A rather nice 5-channel Hi-Fi amplifier with bouncing/intermittent power switch and mechanical problems.


Please click on the images to enlarge

Before the repair, the mains transformers were too fat to fit between the heatsinks on adjacent channels. This caused them to progressively 'lean' towards the right of the casework. They were only fixed to the casework from underneath and were beginning to work loose Pre-repair mounting of the mains transformers using a bolt and dished washer. Because the channel was leaning, the capacitors (top-right) were contacting the base of the casework causing connection problems Inadequate mains input terminals crimping solid core cable. The cable was beginning to work loose Mains power circuit board incorporating our modification (small white board) to allow the power switch to reliably turn the amp on and off. Also contains a few minor modifications to increase the reliability of the amplifier. Note the replaced input terminal blocks to the right of the board Disassembly of the amplifier channels in order to drill and tap the tops of the heatsinks and pot the transformers Filling the transformer centres with potting resin to provide a new fixing. Getting rid of the dished washer saves a few millimetres per channel which was enough to allow them to sit straight within the casework Post-repair mounting of the transformers without the dished washer Additional mechanical bracing to prevent amplifier channels moving in the future. The channels now sit solid and straight Powered up, the K5 logo now lights up

  • Corrected factory mechanical design flaws, major overhaul
    • Transformers were too fat to fit between channels
    • Input terminal blocks inadequate
    • No secondary side connection to mains earth
  • Made power switch operate correctly
    • Power switch would bounce on and off when pressed.


Description of images:
  1. Before the repair, the mains transformers were too fat to fit between the heatsinks on adjacent channels. This caused them to progressively 'lean' towards the right of the casework. They were only fixed to the casework from underneath and were beginning to work loose
  2. Pre-repair mounting of the mains transformers using a bolt and dished washer. Because the channel was leaning, the capacitors (top-right) were contacting the base of the casework causing connection problems
  3. Inadequate mains input terminals crimping solid core cable. The cable was beginning to work loose
  4. Mains power circuit board incorporating our modification (small white board) to allow the power switch to reliably turn the amp on and off. Also contains a few minor modifications to increase the reliability of the amplifier. Note the replaced input terminal blocks to the right of the board
  5. Disassembly of the amplifier channels in order to drill and tap the tops of the heatsinks and pot the transformers
  6. Filling the transformer centres with potting resin to provide a new fixing. Getting rid of the dished washer saves a few millimetres per channel which was enough to allow them to sit straight within the casework
  7. Post-repair mounting of the transformers without the dished washer
  8. Additional mechanical bracing to prevent amplifier channels moving in the future. The channels now sit solid and straight
  9. Powered up, the K5 logo now lights up

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