Vintage Philips GM 5650/02 Valve Tube Oscilloscope

Manufacturer: Philips
Model: GM 5650/02
Serial Number: D 2479
Power Input: 110–245 VAC
Power Consumption: 60 W
Supply Frequency: 50–100 Hz

This is a vintage single-channel cathode-ray oscilloscope intended for laboratory, service and educational use.

Visible front-panel features include:

• CRT display with graticule
• Intensity adjustment
• Focus adjustment
• Horizontal time-base control
• Vertical sensitivity control
• Synchronization and triggering controls
• External synchronization/trigger input
• Ground connection
• 1:1, 1:30 and 1:100 input connections
• Carrying handle
• Fixed power cable

Published model information identifies the Philips GM 5650/02 as a valve/tube oscilloscope introduced around 1956. The published reference lists ten internal tubes, a metal cabinet and approximate dimensions of 115 × 235 × 315 mm. These are external model-reference specifications and the performance of this particular unit has not been verified.

Testing and condition:

The unit powers on and the internal valves/tubes light up. However, nothing appears on the CRT screen. No trace, image or other display output was observed.

No further functional testing has been performed. The cause of the missing display is unknown. CRT operation, sweep, triggering, vertical amplification, signal inputs, controls and measurement accuracy remain unverified.

Due to the missing display and the age of the internal valve electronics, the unit is being sold for parts or repair. Inspection and servicing by a qualified technician will be required.

The equipment has cosmetic wear consistent with its age, including scratches, marks, dirt, surface wear and deterioration of the carrying handle.

Included:

• One Philips GM 5650/02 oscilloscope
• Attached power cable
• No probes
• No test leads
• No manuals
• No additional accessories

Please inspect all photographs carefully. The photographs show the exact item included in the sale.