GPO / BT Telephone 28A – Linesman Test Phone (Yellow Engineer Test Set)

Original GPO / British Telecom Telephone 28A, a professional linesman’s test telephone used by engineers for fault finding, line testing, and network maintenance.

A classic piece of later-era telecom equipment with the distinctive yellow impact-resistant case.

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Features

• DTMF push-button keypad (tone dialling)
• Multiple test modes including:
  • Tone / Pulse
  • Loop / Monitor
  • Battery Feed / Ring functions
• Indicator lights for:
  • Monitor
  • Intercom
  • Battery Feed
• Line connection terminals (+ / -)
• Original handset with coiled lead
• Carry strap fitted

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Condition

• Untested – sold as seen
• Good overall condition:
  • Bright, clean casing with some minor marks from use
  • Keypad and switches appear intact
  • Internals look complete
• No obvious damage