---
product_id: 254570336
title: "Douk Audio Nobsound Vacuum Tube Amp Amplifier Plate Bias Current Probe Tester 8 Pin Socket for EL34, KT88, 6L6, 6V6, 5881, 6550, KT66, KT100, KT120, 7027 (CT1-P, Plate Current)"
brand: "douk audio"
price: "550 DH"
currency: MAD
in_stock: true
reviews_count: 5
category: "Douk Audio"
url: https://www.desertcart.ma/products/254570336-douk-audio-nobsound-vacuum-tube-amp-amplifier-plate-bias-current
store_origin: MA
region: Morocco
---

# Accurate plate current measurement up to 200mA Universal 8-pin socket compatibility Quick, real-time bias testing Douk Audio Nobsound Vacuum Tube Amp Amplifier Plate Bias Current Probe Tester 8 Pin Socket for EL34, KT88, 6L6, 6V6, 5881, 6550, KT66, KT100, KT120, 7027 (CT1-P, Plate Current)

**Brand:** douk audio
**Price:** 550 DH
**Availability:** ✅ In Stock

## Summary

> 🎸 Tune your tone like a pro—never miss a beat with precision bias testing!

## Quick Answers

- **What is this?** Douk Audio Nobsound Vacuum Tube Amp Amplifier Plate Bias Current Probe Tester 8 Pin Socket for EL34, KT88, 6L6, 6V6, 5881, 6550, KT66, KT100, KT120, 7027 (CT1-P, Plate Current) by douk audio
- **How much does it cost?** 550 DH with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.ma](https://www.desertcart.ma/products/254570336-douk-audio-nobsound-vacuum-tube-amp-amplifier-plate-bias-current)

## Best For

- douk audio enthusiasts

## Why This Product

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

## Key Features

- • **Plug & Play Setup:** Simple 4-step connection process for instant, reliable measurements.
- • **Amp Health Assurance:** Ensure your tube amp runs at peak tone and longevity with every test.
- • **Compact & Lightweight:** Portable 109g design fits easily in your toolkit or gig bag.
- • **Precision Bias Tuning:** Get exact plate current readings to optimize your tube amp’s performance.
- • **Universal Tube Compatibility:** Works seamlessly with EL34, KT88, 6L6, 6V6, 5881, 6550, KT66, KT100, KT120, and 7027 tubes.

## Overview

The Douk Audio Nobsound Vacuum Tube Amp Amplifier Plate Bias Current Probe Tester is a compact, lightweight device designed for precise measurement of plate current in a wide range of 8-pin vacuum tubes. Compatible with popular tube models like EL34 and KT88, it enables quick, accurate bias adjustments to optimize amplifier performance and extend tube life. Ideal for musicians and audio professionals seeking reliable amp maintenance.

## Description

How to use: 01. Turn off your amp. 02. Remove tube 03. Insert probe 04. Insert black banana plug in the COM jack of your multimeter 05. Insert red banana plug in the mA jack of your multimeter 06. Insert tube in the socket of the probe 07. Set your multimeter to the mA range (most common is 200mA) 08. Turn on your amp 09. Allow tube to warm up 10. You will get a direct reading in mA 11. Repeat in reverse 12. all done Packing List: 1 * plate current probe (assembled for use)

Review: Excelente producto.
Review: These work well for biasing power tubes as long as you know what you’re doing. Using these requires handling them while high voltage may be present so be careful. I would go with the plate version as this will give you a more accurate reading without having to make a calculation for screen current as with the cathode version. The only flaw I see is they could have longer wires.

## Features

- manufacturer: Generic
- Item Trademark: GENERIC
- Item Category: Electric Circuit Testing Device

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B07CR5DN1V |
| Item model number | GFB1169 |
| Manufacturer | Nobsound |
| Package Dimensions | 15.29 x 15.19 x 5.11 cm; 109 g |

## Product Details

- **Brand:** Douk Audio
- **Manufacturer:** Nobsound
- **Mounting type:** Surface Mount
- **Number of channels:** 8
- **Voltage:** 6 Volts

## Images

![Douk Audio Nobsound Vacuum Tube Amp Amplifier Plate Bias Current Probe Tester 8 Pin Socket for EL34, KT88, 6L6, 6V6, 5881, 6550, KT66, KT100, KT120, 7027 (CT1-P, Plate Current) - Image 1](https://m.media-amazon.com/images/I/616lTdw4uQL.jpg)
![Douk Audio Nobsound Vacuum Tube Amp Amplifier Plate Bias Current Probe Tester 8 Pin Socket for EL34, KT88, 6L6, 6V6, 5881, 6550, KT66, KT100, KT120, 7027 (CT1-P, Plate Current) - Image 2](https://m.media-amazon.com/images/I/61UiZdgf-cL.jpg)
![Douk Audio Nobsound Vacuum Tube Amp Amplifier Plate Bias Current Probe Tester 8 Pin Socket for EL34, KT88, 6L6, 6V6, 5881, 6550, KT66, KT100, KT120, 7027 (CT1-P, Plate Current) - Image 3](https://m.media-amazon.com/images/I/61PRV58ycBL.jpg)
![Douk Audio Nobsound Vacuum Tube Amp Amplifier Plate Bias Current Probe Tester 8 Pin Socket for EL34, KT88, 6L6, 6V6, 5881, 6550, KT66, KT100, KT120, 7027 (CT1-P, Plate Current) - Image 4](https://m.media-amazon.com/images/I/41zK8u-ReBL.jpg)
![Douk Audio Nobsound Vacuum Tube Amp Amplifier Plate Bias Current Probe Tester 8 Pin Socket for EL34, KT88, 6L6, 6V6, 5881, 6550, KT66, KT100, KT120, 7027 (CT1-P, Plate Current) - Image 5](https://m.media-amazon.com/images/I/61c2tHG-qQL.jpg)

## Available Options

This product comes in different **Model** options.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Review
*by C***Z on 12 January 2026*

Excelente producto.

### ⭐⭐⭐⭐⭐ Review
*by P***Z on 27 February 2026*

These work well for biasing power tubes as long as you know what you’re doing. Using these requires handling them while high voltage may be present so be careful. I would go with the plate version as this will give you a more accurate reading without having to make a calculation for screen current as with the cathode version. The only flaw I see is they could have longer wires.

### ⭐⭐⭐⭐⭐ Review
*by R***Z on 19 September 2020*

Worked as described. Was able to read my plate current easily on my tube amp. Great tool for checking the bias of your tube amp. The leads could be slightly longer but, still a good product.

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*Product available on Desertcart Morocco*
*Store origin: MA*
*Last updated: 2026-03-10*