---
product_id: 121343423
title: "COOCHEER Blues Jr. / Pro Jr. JJ Tube Upgrade Kit (2x EL84, 3x 12AX7)"
brand: "coocheer"
price: "€ 225.13"
currency: EUR
in_stock: true
url: https://www.desertcart.gr/products/121343423-coocheer-blues-jr-pro-jr-jj-tube-upgrade-kit-2x
store_origin: GR
region: Greece
---

# 2x EL84 tubes Compact dimensions 3x 12AX7 tubes COOCHEER Blues Jr. / Pro Jr. JJ Tube Upgrade Kit (2x EL84, 3x 12AX7)

**Brand:** coocheer
**Price:** € 225.13
**Availability:** ✅ In Stock

## Summary

> 🎶 Unleash Your Inner Rock Star with Every Note!

## Quick Answers

- **What is this?** COOCHEER Blues Jr. / Pro Jr. JJ Tube Upgrade Kit (2x EL84, 3x 12AX7) by coocheer
- **How much does it cost?** € 225.13 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.gr](https://www.desertcart.gr/products/121343423-coocheer-blues-jr-pro-jr-jj-tube-upgrade-kit-2x)

## Best For

- coocheer enthusiasts

## Why This Product

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

## Key Features

- • **Compact Size:** Perfectly sized at 17.78 x 12.7 x 17.78 cm for any setup.
- • **Precision Matched:** Apex matched EL84 tubes for optimal performance.
- • **Elevate Your Sound:** Transform your audio experience with premium tube upgrades.
- • **Lightweight Design:** Weighs only 68g for easy installation and portability.
- • **No Batteries Needed:** Plug and play convenience—just install and enjoy!

## Overview

The COOCHEER Blues Jr. / Pro Jr. JJ Tube Upgrade Kit includes two T-EL84-JJ tubes and three T-12AX7-S-JJ tubes, designed to enhance your amplifier's sound quality. With a lightweight design and compact dimensions, this kit is perfect for musicians seeking to elevate their audio experience without the hassle of batteries.

## Description

(3) T-12AX7-S-JJ (1) T-EL84-JJ-MP (Apex Matched), which includes:(2) T-EL84-JJ (2) T-EL84-JJ

## Features

- (3) T-12AX7-S-JJ
- (1) T-EL84-JJ-MP (Apex Matched), which includes:(2) T-EL84-JJ

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Product Dimensions | 17.78 x 12.7 x 17.78 cm; 68 g |
| Item model number | 4308828235 |
| Volume | 245 Cubic Inches |
| Quantity | 1 |
| Batteries required | No |
| Batteries Included | No |
| Item Weight | 68 g |

## Images

![COOCHEER Blues Jr. / Pro Jr. JJ Tube Upgrade Kit (2x EL84, 3x 12AX7) - Image 1](https://m.media-amazon.com/images/I/71ebOnfI2wL.jpg)

## Questions & Answers

**Q: Will this set work in a vox ac15?**
A: If your amp requires 3x12AX7's and 2x EL84's then this set will work perfectly.

**Q: Who or what is tesla?  this was previously listed as a jj set, now it says jj/tesla.**
A: Nikola Tesla was an inventor, electrical engineer, mechanical engineer best known for his contributions to the design of modern alternating current. How JJ co-opted his name is unknown to me.  As for the tubes I am not a fan.  I tried them several times in different amps and beyond those suffering infant mortality (nearly immediate failure) I found them to be short lived overall.  I pretty much stick with TAD (Tube Amp Doctor) tubes these days. They sound good and the failure rate is very low.  Strictly my opinion, but I hope it helps you with your decision.

**Q: this set fits on a laney cub 12r?**
A: Yes

**Q: Will these work for a blues junior 1?**
A: They work and still do, a 12AX7was bad, so bought a set ans have new extras, different valve/tubes. they work fine

## Frequently Bought Together

- Blues Jr. / Pro Jr. JJ Tube Upgrade Kit (2x EL84, 3x 12AX7)
- JJ Electronics Amplifier Tube (T-12AT7-JJ)
- 12AX7 / ECC83 - JJ Electronics, Pin Type: Regular, package of 4

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**Shop now:** [https://www.desertcart.gr/products/121343423-coocheer-blues-jr-pro-jr-jj-tube-upgrade-kit-2x](https://www.desertcart.gr/products/121343423-coocheer-blues-jr-pro-jr-jj-tube-upgrade-kit-2x)

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*Product available on Desertcart Greece*
*Store origin: GR*
*Last updated: 2026-01-25*