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Item #:
72828850
4pcs Probes EL84 6BQ5 7189 6P14 6P1 E84L EL84M EL84S EL86 7189A for V8 Vacuum Tube Tester Bias Probe 9pin Tube Tester Current Probe
Item #:
72828850
PHP 2313
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Order now and get it around Sunday, August 30
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V8 DIY tester can measures the cathode current of the power tube for bias reading (at low voltage side of the tubes)
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Note: Step Down Voltage Transformer required for using electronics products of US store (110-120). Recommended power converters Buy Now.
What Stands Out
Dual Bias Probes
Equipped with dual bias current probes, this tester provides enhanced precision for evaluating 9pin and octal vacuum tubes, ensuring accurate readings for various tube types.
Wide Compatibility
Compatible with a broad range of vacuum tubes, including popular models like EL84 and KT88, making it an essential tool for both hobbyists and professionals in tube amplification.
User-Friendly Design
Designed for ease of use, this tester allows for quick setup and straightforward operation, helping users efficiently diagnose and optimize tube performance without technical expertise.
Product Details
- Global voltage standard (100V~240V) for universal use
- Octal 8pin probes cable length: 55cm
- All-metal fuselage with a separate resin board to prevent short circuits
- Measures the cathode current of power tubes for bias reading at low voltage
- Test various tube types including EL34 KT88 6L6 6V6 5881 6550 KT66 KT100 KT120 7027
- Direct reading from the current meter with LED Amp Meter for better performance
| Power Source | Corded Electric |
| Measurement Type | Ammeter |
| Style Name | Handheld |
| Color | Gold |
| Item Weight | 0.1 Kilograms |
| Item Dimensions | 5.91 x 3.94 x 3.15 inches (15 x 10 x 8 cm) |
| Specification Met | CE, NIST |
| Brand Name | AMPTATA |
| Model | V8 |
| UPC | 761594314279 |
| Manufacturer | AMPTATA |
| Unit Count | 4.0 Count |
| Brand | AMPTATA |
| Style | Handheld |
Who Should Buy?
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Tube Amplifier Enthusiasts
Ideal for hobbyists who frequently work with vacuum tube amplifiers to test and maintain their equipment's performance.
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Audio Technicians
Great for professionals who require accurate testing of various tube types in audio equipment for optimal sound quality.
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DIY Electronics Fans
Perfect for DIYers who build or modify tube amplifiers and want to ensure their tubes operate effectively.
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Casual Users
Not suitable for those with only a casual interest in tubes, as it requires specialized knowledge and experience.
Product Description
4pcs Probes EL84 6BQ5 7189 6P14 6P1 E84L EL84M EL84S EL86 7189A for V8 Vacuum Tube Tester Bias Probe 9pin Tube Tester Current Probe
Have any Query? Chat with us
Customer Questions & Answers
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Question:
What types of vacuum tubes can the T4 DIY Vacuum Tube Tester test?
Answer: The T4 DIY Vacuum Tube Tester is designed to test a wide range of vacuum tubes, including EL84, 6BQ5, EL34, KT88, 6L6, 6CA7, 6V6, 5881, 6550, KT66, KT100, and KT120. This broad compatibility is beneficial for enthusiasts and professionals alike, allowing them to evaluate the performance of various tubes used in audio applications. Whether you’re working with vintage amplifiers or modern tube equipment, this tester offers precise readings for optimal performance tuning. -
Question:
How does the Dual Bias Current Probes feature work?
Answer: The Dual Bias Current Probes on the T4 Vacuum Tube Tester allow you to measure the bias current of your vacuum tubes accurately. By connecting the probes to the tube socket, you can easily obtain real-time readings, ensuring your tubes operate within safe and optimal parameters. This feature is particularly useful for audio technicians who want to maximize the sound quality and longevity of their vacuum tubes, providing detailed insights into their performance behavior in different circuit configurations. -
Question:
Is it difficult to use the T4 DIY Vacuum Tube Tester?
Answer: The T4 DIY Vacuum Tube Tester is designed with user-friendly functionality in mind, making it accessible for both beginners and experienced users. The interface typically features simple controls and clear indicators, allowing users to start testing tubes with minimal setup. Whether you’re a hobbyist looking to diagnose your gear or a professional seeking advanced testing options, the intuitive design facilitates a hassle-free experience, making tube testing straightforward and informative. -
Question:
Can I test both 9-pin and octal tubes with this tester?
Answer: Yes, the T4 DIY Vacuum Tube Tester is capable of testing both 9-pin and octal tubes, making it a versatile tool for tube enthusiasts. With dedicated settings for each pin configuration, users can easily switch between testing formats without the need for extra adapters. This flexibility is especially useful for those who work with a range of tube types, allowing for quick and efficient testing sessions across various projects or repairs. -
Question:
What are the benefits of using a vacuum tube tester like the T4?
Answer: Using a vacuum tube tester like the T4 allows for accurate diagnostics of tube performance, helping you identify issues such as weak emission or grid leakage. Regular testing can prolong the life of your tubes, enhance sound quality, and prevent damage to your audio equipment by ensuring all components are functioning correctly. For musicians and audio professionals, having a reliable tester ensures that your equipment delivers the best possible sound every time you perform or record. -
Question:
Is the T4 tester suitable for beginners?
Answer: Absolutely! The T4 DIY Vacuum Tube Tester is well-suited for beginners thanks to its intuitive design and clear instructions. New users can learn to test tubes without advanced technical knowledge, making it a great entry point for those new to vacuum tube technology. As you become more comfortable with tube testing, you can explore more advanced features the tester offers, making it a valuable tool throughout your learning journey. -
Question:
What safety precautions should I consider when using the T4 tester?
Answer: When using the T4 DIY Vacuum Tube Tester, safety precautions are essential. Always ensure your equipment is powered off before connecting or disconnecting tubes to prevent electrical shock. Familiarize yourself with the tester's operation manual and adhere to all recommendations. Wearing safety goggles and working in a well-ventilated area can also enhance safety when handling high-voltage components. By following these measures, you can work confidently and securely with your vacuum tubes. -
Question:
What features make the T4 tester stand out from other tube testers?
Answer: The T4 DIY Vacuum Tube Tester features numerous appealing aspects, such as support for multiple tube types, dual bias current probes, and user-friendly operation. Its ability to provide detailed bias measurements and performance diagnostics sets it apart from basic testers. Additionally, its versatility in working with both 9-pin and octal tubes makes it suitable for a variety of applications, from audiophile setups to vintage radio restoration, ensuring wider usability among different user needs. -
Question:
Can I calibrate the T4 Vacuum Tube Tester for more accuracy?
Answer: The T4 DIY Vacuum Tube Tester may come with calibration options or procedures to enhance accuracy, depending on the model. Calibrating your tester ensures you achieve the most precise results possible. Following the manufacturer’s instructions for calibration is vital, and regular checks should be made to maintain accuracy over time. This feature is crucial for audio professionals or hobbyists who depend on precision in their work, allowing you to ensure that measurements reflect true tube performance. -
Question:
Where can I buy the T4 DIY Vacuum Tube Tester?
Answer: You can purchase the T4 DIY Vacuum Tube Tester from Ubuy. They offer a wide selection of tools and electronic components, making it a reliable platform for your testing needs. Ubuy provides convenient access to this product along with necessary information to help you make informed decisions. For those located in Philippines, Ubuy is the ideal destination to source your vacuum tube tester efficiently.
AMPTATA Test Probes & Leads Editorial Review
** Vacuum Tube Tester Bias Probe** The Vacuum Tube Tester Bias Probe has garnered a mix of positive feedback and some concerns among users, predominantly those well-versed in tube amplifier technology. This device allows technicians and hobbyists to check the current of up to four tubes simultaneously, making it a time-saving tool in the design and repair of tube amplifiers. Many users praise its accuracy, often confirming the device's readings against those of more expensive meters with satisfactory results. With its straightforward operation, the Bias Probe enables users to easily tweak amplifier designs without the need for complex calculations. Reviewers particularly appreciate the ability to see current draw adjustments in real-time as components are replaced, which can be essential during the prototyping phase. Furthermore, the reported components appear durable, and the adequate cable length adds to the overall user experience. However, not all feedback was favorable. Some users raised safety concerns regarding the device’s design, especially about the plug connections. The risk associated with potential disconnections while the amplifier is powered could lead to hazards. Additionally, the lack of proper documentation limited the user’s ability to navigate the device’s capabilities fully and some noted calibration issues that required adjustments post-purchase. Overall, for those who have a good understanding of tube amplifiers and their components, the Vacuum Tube Tester Bias Probe offers great value, ease of use, and accuracy. Nonetheless, potential buyers should be aware of the safety concerns and the need for careful handling. **
Customer Reviews & Ratings
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Pros
- Allows for checking current in up to four tubes simultaneously.
- Accurate readings, even when compared to more expensive devices.
- Simplifies the process of bias adjustment in tube amplifiers.
- Durable Construction with adequate cable length.
Cons
- Safety concerns regarding the design and connection types.
Platform Trust & Buyer Confidence
MA
Mohammad
Verified buyer
“Excellent quality and original too,when ubuy send original things I will appreciate that ,I very satisfied thank you”
23 July 2026 · via Trustpilot
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Chitra
Verified buyer
“The order and delivery progress was communicated very well. Package arrived within the estimated time. Products arrived as expected in good condition.”
22-Jul-26 · via Trustpilot
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kund
Verified buyer
“Good supply of products. Safe payment methods, and shipment worldwide! Genuine products.”
23-Jul-26 · via Trustpilot
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Onesi
Verified buyer
“Was my first time buying a product from Ubuy, but I found it so helpful. This is reliable. Gonna place a new order!”
22 July 2026 · via Trustpilot
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SAO JOHN
Verified buyer
“Ubuy is a great online platform to buy stuff. Reliable, fast delivery time and great value for money. I've been using Ubuy online shopping platform for three years now and will continue to do so.”
23 July 2026 · via Trustpilot
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PHP 2313
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Features & Benefits
- V8 DIY tester is a versatile tool for measuring cathode current
- Suitable for EL34 KT88 6L6 6V6 5881 6550 KT66 KT100 KT120 7027 etc.
- Reads the cathode current directly from the current meter
- Global voltage standard (100V~240V)
- Use LED Amp Meter Ammeter Current Panel for better performance
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