Replacement Valve Kit for Marshall JCM900 SL-X 50W (3 x 12AX7EH 1 x Balanced 12AX7EH 2 x Marshall Matched EL34)

Best Replacement Valve Kit for Marshall JCM900 SL-X 50W


In Stock

500 in stock

SKU: AMPKIT860 Category:

All single valves, matched pairs and matched quads are fully tested in our warehouse before dispatch. These valves will guarantee awesome tone and amazing power. You WILL hear the difference. So get your amp sounding better than ever. Order your replacement valves today.


Need a replacement valve kit for Marshall JCM900 SL-X 50W EL34 amplifiers?

This is the EL34 replacement valve kit for Marshall JCM900 SL-X 50W head. It will get your amplifier sounding better than ever. These superior quality valves will give you a significant upgrade in both tone and power. The best value for money amplifier valves on the market today. This superb valve kit comprises:

  • 3 x Premium Grade Eelctro Harmonix 12AX7EH preamp valves (also called 12AX7).
  • 1 x Premium Grade Electro Harmonix Balanced 12AX7EH for the phase splitter position (V4).
  • 2 x Premium Grade Marshall matched EL34 power valves/power tubes. 

If you currently have Marshall valves in your amplifier and love the sound then this is the valve set for you.

Marshall valves for Marshall amplifiers

All of our power valves are original Marshall valves, branded and fully tested. Every valve is guaranteed.

So treat yourself to a brand new set of incredible sounding valves today. They will restore the power, tone and clarity to your Marshall guitar amplifier.

  1. Amazing tone. Surely this is what matters most. The number one priority for any guitarist has to be the tone. Warm, rich, fat and juicy are the words that best describe the sound from these valves.
  2. Sustained valve/tube power to make the most of every stage in the amplifier chain. It is the balance between volume and tone that distinguishes a really great valve from a mediocre valve.
  3. Long valve life.  Guitar amplifiers have to be built to take the knocks. This is also very important when it comes to the amplifier valves themselves.

Do you have any questions about this valve kit? 

If you have any questions about replacing your valves please drop us an email. We have more than 30 years experience so we are sure we can help.

Please check out our FAQ section first though. Here you will find the answers to most questions as well as some useful tips if you have never upgraded your tubes before.

The best replacement valve kit for Marshall JCM900 SL-X 50W on the market. 
  • Every valve kit is carefully selected, fully tested, digitally balanced and matched before we ship to you.
  • Our valves have the highest quality control, minimal noise and extremely low harmonics.
  • Marshall’s reputation for quality, superb tine and long life is legendary.
  • We have a range of fast delivery options with full tracking and insurance. So you know they will be delivered safely.
  • Global delivery – we ship all over the world.
What do these valves sound like?

This Selected Premium Grade valve set delivers the highest quality control, minimal noise and very low microphonic. this ensures so you get the very best tone from your amplifier. You really can hear the difference.

Tight and full crisp bass response without any muddiness. A mellow and very rich middle range offering you either crunch or crystal clean when required. A fully saturated overdrive with exceptional sustain across the range. A beautiful glassy top end that can be easily varied to suit your style of playing.

About the amp:

This JCM900 SL-X was produced between 1993 and 1999. It came in two power versions, 50 watts and 100 watts. It also came with two different power valve sets so you could either choose the EL34 or the 5881 depending on your taste. This is the Slash version of the JCM-900 lead amplifier and you will note that has an extra valve in the pre-amp section. There are two foot-switchable channels with independent volume controls.

  • Extra ECC83 (also called a 12AX7) valve in the pre-amp.
  • Pre-amp volume control and Gain sensitivity.
  • Series Effects loop.
  • Direct recording Line Out.
  • Fail-safe circuit to keep the amp running in the event of a valve failure.
  • Dimensions: 750 x 310 x 220 mm.
  • Weight: 18.4 Kg.

Tubes for sale for Marshall JCM900 SL-X head. Our tubes guarantee awesome tone and restore the power and clarity to your amp. All valves 100% guaranteed. Carefully matched and selected.

Additional information

Weight0.33 kg
Dimensions15 × 15 × 15 cm
Order now:
Best Replacement Valve Kit for Marshall JCM900 SL-X 50W

Replacement Valve Kit for Marshall JCM900 SL-X 50W (3 x 12AX7EH 1 x Balanced 12AX7EH 2 x Marshall Matched EL34)