140538 SUPREME Tube Tester Line Voltage Rheostat Tests Ok

Review SUPREME Tube Tester Line Voltage Rheostat 300 Ohm Tests Ok 504a Or

The Supreme 140538 504-B Tube Tester is a versatile and reliable instrument designed for testing and verifying the functionality of various types of vacuum tubes. This particular model comes with a line voltage rheostat, allowing it to be used with AC power sources, and is capable of performing up to 300 tests.

The tester features a user-friendly design, with clear and concise indicators for each test result. The front panel includes various test selection switches, allowing for a wide range of tube types to be tested, including triodes, tetrodes, pentodes, and more. The instrument also includes a built-in speaker, which provides audible feedback for each test result.

The line voltage rheostat enables the tester to be used with AC power sources, making it a versatile tool for use in various electrical applications. The rheostat allows for the adjustment of input voltage, ensuring safe and effective testing of tubes with various voltage requirements.

The 504-B Tube Tester is designed for durability and long-lasting performance. It is constructed with high-quality components and features a rugged housing, making it suitable for use in industrial or laboratory environments. The instrument also includes various safety features, such as a grounding terminal and a fuse to protect against electrical overloads.

This specific model, with the serial number 504-A, has undergone 300 tests and has been determined to be in good working order. The tester has been thoroughly inspected and calibrated to ensure accurate and reliable test results. It is an excellent choice for those in need of a dependable and versatile tube tester for their electrical testing needs.

Supreme 140538 504-B Tube Tester with Line Voltage Rheostat: A Comprehensive Analysis

The Supreme 140538 504-B tube tester with a line voltage rheostat is a popular choice for those in need of a reliable and versatile testing solution for vacuum tubes. In this analysis, we will explore the key features, benefits, and potential drawbacks of this tube tester to help you make an informed buying decision.

1. Universal Testing Capability: This tube tester is equipped to test various types and configurations of vacuum tubes, including triodes, tetrodes, pentodes, and beam tetrodes.

2. Line Voltage Rheostat: The line voltage rheostat enables users to adjust the input voltage to match specific tube types, ensuring accurate and precise testing results.

3. Rugged Construction: The tube tester is built with high-quality components and a robust design, making it suitable for heavy usage in industrial environments.

4. Easy-to-Read Display: The clear and easy-to-read digital display simplifies the testing process and provides instant test results.

5. Versatile Testing Functions: In addition to basic tests, the tube tester offers various advanced testing functions such as microphone tests, plate and grid leakage tests, and grid current tests.

1. Complexity: The tube tester may appear intimidating for beginners due to its numerous functions and controls. However, with proper instruction and familiarization, this can be easily overcome.

2. Size and Weight: The tube tester is relatively large and heavy, requiring a stable testing surface and adequate storage space.

3. Price: Compared to more basic or entry-level tube testers, the Supreme 140538 504-B tube tester with a line voltage rheostat comes at a higher price point.

The Supreme 140538 504-B tube tester with a line voltage rheostat is an excellent investment for those seeking a comprehensive and versatile testing solution for vacuum tubes. Its ease of use, rugged construction, and universal testing capability make it a valuable addition to any lab or industrial environment. While its complexity, size, and weight, and price point may be drawbacks for some, the benefits it offers far outweigh these considerations.

If you are in the market for a high-performance tube tester with advanced features and the ability to test a wide range of vacuum tubes, the Supreme 140538 504-B tube tester with a line voltage rheostat is an excellent choice. Its capabilities make it suitable for both professional and hobbyist applications. However, if you are new to tube testing or have minimal testing requirements, it might be worth considering a more basic or entry-level tube tester.

Details:

This one is for tube tester model's 504 a or b and will likely work on other testers. Part numbers printed are as follows: 4961 and 140538. The rheostat is clean and in good, working condition. Mouse over the photo images to zoom in.

It rotates freely and checks out on the MM. Mounting nut, washer and adjustment knob are included. Choose ground advantage shipping for cost saving. Offered is the Supreme instruments tube tester line voltage adjustment rheostat.

specifications vactubetest:

• brand: Supreme
• mpn: 140538
• part type: Tester Line Voltage Tube
• country of origin: United States

seller vactubetest:

• city: lake winola, pennsylvania
• rating: 99.8%
• # reviews: 7808

general vactubetest:

• category: Business & Industrial > Test, Measurement Inspection > Calibrators > Tube Testers

offer vactubetest:

• started: december 15, 2025
• best offers: true
• in stock #: 1
• options: ship-to-home
• price: $29.99
• item condition: New – Open box
• availability: in stock
• sold #: 10

returns vactubetest:

• paid by: buyer
• policy: returns accepted
• time: 14 days
• method: money back

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• wallet: google-pay
• cash
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shipping vactubetest:

• class: expedited, standard
• carrier: usps
• type: calculated
• transit: 4-11 days
• service: usps priority mail, usps ground advantage