---
product_id: 720218809
title: "T4 DIY Vacuum Tube Tester 9pin and Octal 8pin Dual Bias Current Probes Tester Meter for EL84 6BQ5 EL34 KT88 6L6 6CA7 6V6 5881 6550 KT66 KT100 KT120 Vacuum Tube Amp Amplifier Cathode Current …"
brand: "amptata"
price: "793 Lei"
currency: RON
in_stock: false
reviews_count: 1
url: https://www.desertcart.ro/products/720218809-t4-diy-vacuum-tube-tester-9pin-and-octal-8pin-dual
store_origin: RO
region: Romania
---

# Supports top amp tubes like EL34 & KT88 Precise bias current measurement Dual 9pin & 8pin compatibility T4 DIY Vacuum Tube Tester 9pin and Octal 8pin Dual Bias Current Probes Tester Meter for EL84 6BQ5 EL34 KT88 6L6 6CA7 6V6 5881 6550 KT66 KT100 KT120 Vacuum Tube Amp Amplifier Cathode Current …

**Brand:** amptata
**Price:** 793 Lei
**Availability:** ❌ Out of Stock

## Summary

> 🎛️ Master your tube amp’s heartbeat with precision power!

## Quick Answers

- **What is this?** T4 DIY Vacuum Tube Tester 9pin and Octal 8pin Dual Bias Current Probes Tester Meter for EL84 6BQ5 EL34 KT88 6L6 6CA7 6V6 5881 6550 KT66 KT100 KT120 Vacuum Tube Amp Amplifier Cathode Current … by amptata
- **How much does it cost?** 793 Lei with free shipping
- **Is it available?** Currently out of stock
- **Where can I buy it?** [www.desertcart.ro](https://www.desertcart.ro/products/720218809-t4-diy-vacuum-tube-tester-9pin-and-octal-8pin-dual)

## Best For

- amptata enthusiasts

## Why This Product

- Trusted amptata brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Plug & Play Design:** Easy setup for quick diagnostics without hassle
- • **Future-Proof Your Sound:** Stay ahead with support for classic and modern vacuum tubes
- • **Dual Bias Current Probes:** Accurately measure cathode current for optimal amp performance
- • **Professional Grade Precision:** Ensure your tube amps run at peak efficiency every time
- • **Universal Tube Compatibility:** Test EL34, KT88, 6L6, EL84 & more with one device

## Overview

The T4 DIY Vacuum Tube Tester is a versatile meter designed for professional and hobbyist tube amp users, supporting both 9pin and 8pin tubes including EL34, KT88, 6L6, and EL84. It features dual bias current probes for precise cathode current measurement, enabling optimal amplifier performance and longevity.

## Description

Brand : AMPTATAModel : T4It's suitable for:EL34 KT88 6L6 6CA7 6V6 5881 6550 KT66 KT100 KT120EL84 6BQ5 6P143.5mm Male Plug Outstanding soldering taken in every adapter.The product measures the cathode current of the power tube for bias reading (at low voltage side of the tubes ).It can Get the reading direct from the current meter. It does not need any convert from mV to mA. It can be work with all kinds of multi meter (Digital meter or analog pointer meters) , at range of 100mA or above.Package Contents1pcs T4 Tester2pcs 8pin EL34 Bias Current Probes2pcs 9pin EL84 Bias Current ProbesUser Manual01: Turn off amplifier.02: Remove the tubes then plug in tester probes socket.03: Then plug tester probes in amplifier socket.04: Turn on amp and let tubes get warm about 5 minutes.Just turn on the amplifier without let speaker sing.05: Read the bias measurement.06: Switch from A to B. Get two reading07: If tube reading is same.That's perfect. If reading is different. Should be no more than 2 or 3 mA difference for a good balance between the tube

## Features

- It's suitable for: EL34 KT88 6L6 6CA7 6V6 5881 6550 KT66 KT100 KT120 and EL84 6BQ5 6P14

## Product Details

- **Brand:** AMPTATA
- **Power Source:** Corded Electric
- **Style:** Digital
- **Color:** white
- **Measurement Type:** Ammeter

## Images

![T4 DIY Vacuum Tube Tester 9pin and Octal 8pin Dual Bias Current Probes Tester Meter for EL84 6BQ5 EL34 KT88 6L6 6CA7 6V6 5881 6550 KT66 KT100 KT120 Vacuum Tube Amp Amplifier Cathode Current … - Image 1](https://m.media-amazon.com/images/I/71wWaLdhGJL.jpg)
![T4 DIY Vacuum Tube Tester 9pin and Octal 8pin Dual Bias Current Probes Tester Meter for EL84 6BQ5 EL34 KT88 6L6 6CA7 6V6 5881 6550 KT66 KT100 KT120 Vacuum Tube Amp Amplifier Cathode Current … - Image 2](https://m.media-amazon.com/images/I/61HVN0Nt6NL.jpg)
![T4 DIY Vacuum Tube Tester 9pin and Octal 8pin Dual Bias Current Probes Tester Meter for EL84 6BQ5 EL34 KT88 6L6 6CA7 6V6 5881 6550 KT66 KT100 KT120 Vacuum Tube Amp Amplifier Cathode Current … - Image 3](https://m.media-amazon.com/images/I/51zx-5Gx2zL.jpg)
![T4 DIY Vacuum Tube Tester 9pin and Octal 8pin Dual Bias Current Probes Tester Meter for EL84 6BQ5 EL34 KT88 6L6 6CA7 6V6 5881 6550 KT66 KT100 KT120 Vacuum Tube Amp Amplifier Cathode Current … - Image 4](https://m.media-amazon.com/images/I/51Z7R5jgNKL.jpg)
![T4 DIY Vacuum Tube Tester 9pin and Octal 8pin Dual Bias Current Probes Tester Meter for EL84 6BQ5 EL34 KT88 6L6 6CA7 6V6 5881 6550 KT66 KT100 KT120 Vacuum Tube Amp Amplifier Cathode Current … - Image 5](https://m.media-amazon.com/images/I/51iZEDwIyEL.jpg)

## Customer Reviews

### ⭐ Too hard to work it
*by L***M on October 11, 2023*

Not for you iuf your not an Engineer

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**Shop now:** [https://www.desertcart.ro/products/720218809-t4-diy-vacuum-tube-tester-9pin-and-octal-8pin-dual](https://www.desertcart.ro/products/720218809-t4-diy-vacuum-tube-tester-9pin-and-octal-8pin-dual)

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*Product available on Desertcart Romania*
*Store origin: RO*
*Last updated: 2026-02-24*