Difficulty

Easy

Steps

6

Time Required

                          35 - 40 minutes

Sections

1

  • 12 AX7A Tube
  • 6 steps

Flags

Member-Contributed Guide

An awesome member of our community made this guide. It is not managed by iFixit staff.

  • BackArt Tube MP AMP

  • Full Screen

  • Options

  • History

  • Save to Favorites

  • Download PDF

  • Translate

  • Get Shareable Link

  • Embed This Guide

  • Notify Me of Changes

  • Stop Notifications

Introduction

What you need

Step 1

              12 AX7A Tube
  • Loosen the 4 screws sideways the device, using a PH1

Loosen the 4 screws sideways the device, using a PH1

1024

Step 2

  • Use the Smart Wrench to loosen the two In- and Output controllers. Attach the Smart Wrench below the controller.
  • Be careful not to damage the surface.
  • Now you can lift up the top of the device, and the mainboard appears.

Use the Smart Wrench to loosen the two In- and Output controllers. Attach the Smart Wrench below the controller.

Be careful not to damage the surface.

Now you can lift up the top of the device, and the mainboard appears.

Step 3

  • Use the Smart Wrench again to loosen the cinch ports on the backside.
  • Attention! Do not lose the washers located at the in- and outside. Two pieces each.

Use the Smart Wrench again to loosen the cinch ports on the backside.

Attention! Do not lose the washers located at the in- and outside. Two pieces each.

Step 4

  • Use the PH 1 to unscrew 2 screws on the motherboard.
  • Now you can take the board out completely
  • Attention: There are again 2 washers.

Use the PH 1 to unscrew 2 screws on the motherboard.

Now you can take the board out completely

Attention: There are again 2 washers.

Step 5

  • Carefully bend the tube up to get a better view
  • Remove the tube with a cloth from the socket, a metal spudger can help
  • Insert the new tube
  • Use cloth so that no residues accumulate on the surface.

Carefully bend the tube up to get a better view

Remove the tube with a cloth from the socket, a metal spudger can help

Insert the new tube

Use cloth so that no residues accumulate on the surface.

Step 6

  • Finally just reassemble all parts.
  • Be careful to tighten all the screws and ports, otherwise internal vibrations could cause damage to your device.
  • First put the cinch ports in to get the mainboard back in place.

Finally just reassemble all parts.

Be careful to tighten all the screws and ports, otherwise internal vibrations could cause damage to your device.

First put the cinch ports in to get the mainboard back in place.

Congratulations you did it :)

Cancel: I did not complete this guide.

                                                                                      2 other people completed this guide.                                             


        These translators are helping us fix the world!      Want to contribute?      Start translating ›

Special thanks to these translators:

100%

Alex Krug

irlanda

Author

                                      with 3 other contributors 


                    Alex Krug

Member since: 12/23/2016

38,158 Reputation

                                      1 Guide authored                  



                       Badges:
                       8







                                                        +5 more badges

Raoul B. - Nov 30, 2017

Reply

Only replace the fuse? Is that the only part that usually breaks?

Holger Klos - Jul 29, 2018

Reply

A tube replacement for this device is not necessarily meant for broken tubes. Most people do it for altering the sound. There is still a modification manual on the web for changing most of the parts like resistors, capacitors and ICs for higher quality.

Greg Baker - Sep 2, 2021

Reply

I didn’t find it necessary to remove the motherboard to replace the tube. The card where the tube socket is located is connected to the main board with two cables. That board may be lifted clear of the chassis just by extending those cables.