---
product_id: 27521676
title: "Eurotubes Pro One Bias Probe For Noval 9 Pin Power Tubes."
brand: "eurotubes"
price: "€ 64.47"
currency: EUR
in_stock: false
url: https://www.desertcart.hr/products/27521676-eurotubes-pro-one-bias-probe-for-noval-9-pin-power
store_origin: HR
region: Croatia
---

# Simultaneous plate current & voltage readout Compatible with EL84 & EL844 tubes Battery-free, self-contained design Eurotubes Pro One Bias Probe For Noval 9 Pin Power Tubes.

**Brand:** eurotubes
**Price:** € 64.47
**Availability:** ❌ Out of Stock

## Summary

> 🎛️ Tune Like a Pro, Play Like a Legend

## Quick Answers

- **What is this?** Eurotubes Pro One Bias Probe For Noval 9 Pin Power Tubes. by eurotubes
- **How much does it cost?** € 64.47 with free shipping
- **Is it available?** Currently out of stock
- **Where can I buy it?** [www.desertcart.hr](https://www.desertcart.hr/products/27521676-eurotubes-pro-one-bias-probe-for-noval-9-pin-power)

## Best For

- eurotubes enthusiasts

## Why This Product

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

## Key Features

- • **Amp-While-You-Tweak:** Adjust your bias live while playing, thanks to innovative 'Test & Play' tech.
- • **Dual Readout Mastery:** Monitor plate current and voltage at once for precision tuning.
- • **Compact & Lightweight:** Weighs just 10.7 oz for easy handling and installation.
- • **Plug & Play Simplicity:** No knobs, switches, or batteries—just instant, hassle-free biasing.
- • **Universal Noval 9-Pin Fit:** Seamlessly compatible with EL84 and EL844 power tubes.

## Overview

The Eurotubes Pro One Bias Probe is a cutting-edge, self-contained device designed for Noval 9-pin power tubes like EL84 and EL844. It uniquely displays plate current and voltage simultaneously without requiring batteries or manual controls, enabling real-time bias adjustments while playing. Lightweight and user-friendly, it’s the ultimate tool for precise amplifier tuning.

## Description

The Eurotubes "Pro One -9” Bias Probe is an "all in one” bias probe for Noval 9 pin power tubes including EL84's and EL844's. It is unique in the fact that it shows you both the plate current and plate voltage simultaneously and it is completely self-contained with no switches, knobs or batteries. The "Pro One” Bias Probe will read out the plate current in the upper readout and the DC plate voltage in the lower readout. Unlike other bias probes the "Pro One” Bias Probe is designed to allow you to play the amp while the probe is installed. So adjust, play, adjust and dial your amp in!

## Features

- Reads both plate current and plate voltage simultaneously!
- Self-contained, no knobs, no switches and works without batteries!
- Compatible with EL84's and EL844's
- Dial in your bias using out “Test & Play” technology!

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B01A7J3J60 |
| Date First Available | January 5, 2016 |
| Is Discontinued By Manufacturer | No |
| Item Weight | 10.7 ounces |
| Item model number | ET Pro one -9 |
| Package Dimensions | 10 x 10 x 8 inches |

## Images

![Eurotubes Pro One Bias Probe For Noval 9 Pin Power Tubes. - Image 1](https://m.media-amazon.com/images/I/61QRd6Th1-L.jpg)
![Eurotubes Pro One Bias Probe For Noval 9 Pin Power Tubes. - Image 2](https://m.media-amazon.com/images/I/71XVI1bXIsL.jpg)

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**Shop now:** [https://www.desertcart.hr/products/27521676-eurotubes-pro-one-bias-probe-for-noval-9-pin-power](https://www.desertcart.hr/products/27521676-eurotubes-pro-one-bias-probe-for-noval-9-pin-power)

---

*Product available on Desertcart Croatia*
*Store origin: HR*
*Last updated: 2026-03-11*