Specifications and Main Features
- Model: 257
- Power supply rating: 110-120 Volt AC
- Function:
- Signs shorts and leakages between tube elements.
- Tests emission quality of multi section tubes individually.
- Controls:
- Holds FILAMENT, G (Grid), K (Cathode Control), and LOAD switches which are described in the tube chart.
- REG-SPEC slide switch for regulation specs settings.
- Indicator lights:
- "SHORT" indicator lamp for conveying shorts or leakage.
- Testing process:
- Quality test break and pre test shorts check
- Measuring good or bad with metric scale.
- Application:
- Tests various types of tubes such black and white picture tubes, color picture tubes and diodes as indicated by * is the chart.
- Additional features:
- Tests screening grid tubes and also rare shorts between the elements of a tube.
Frequently Asked Questions
- What is the Input Voltage for the Model 257?
The Power for the Model 257 is 110-120 Volt A.C.
- This device is used to test which types of tubes?
The use of the model 257 can be tested on many tubes as such black and white picture tubes, color picture tubes and diodes.
- How do I test a tube for shorted condition?
If the “SHORT” indicator lamp illuminates continuously during the tube test, it indicates a short or leakage between cathode and heater or control grid.
- What action should I take if a tube is found to be shorted?
While performing the quality test a tube is short, this should not be conducted in order to avoid damaging the tube tester.
- What instrument is used for tube quality determination?
The quality of the tube is assessed within working limits using the “Good ? Bad” scale after shorts check has been done to ensure there are none.
- Is it possible for the device to test multi-sectioned tubes?
The device is able to test multi-sectioned tubes, it will just involve repeating the testing for each section which is specified in the tube chart.
- What are the possible indicator readings on the meter?
Possible readings on the meter are such sections of green, which test good, red indicates bad, or indicators for diodes for those within the tube.
User Manual
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