Marshall JCM800 Super Bass MKII 100w

Best valves for Marshall JCM800 Super Bass Series MKII 100w amplifiers.

The Marshall JCM800 Super Bass Series amplifier uses:

2 x ECC83 (also called 12AX7) preamp valves,
1 x Balanced ECC83 for the phase inverter (in position V3).
4 x EL34 matched power valves/power tubes.

Note: Due to the shortage of EL34 valves around the time of production, some of these amps were fitted with 5881 power valves instead. If this is the case you will normally find a sticker on the inside of the amp that advises you of this. Best to take a quick look inside your amp before placing an order.

If you have EL34 power valves fitted we offer three options for the Marshall JCM800 Bass Series amplifier:

The Original Branded Marshall EL34 power valves.
The standard JJ EL34 power valves.
The upgraded JJ EL34 Mark II power valves.

The Marshall EL34 is also an excellent choice for this amplifier and many of our customers are loyal to the Marshall brand. If you have these in your amp now and love the sound then this is the set for you.

The standard JJ EL34 valve has been around for many years and is very popular. Great tone and perfect for rock and blues.

The JJ EL34 Mark II is for those who want the ultimate in tone and power. Whilst they cost a few pounds more they are the next generation in EL34 valves. They deliver outstanding bass, a very smooth mid-range and extended life. JJ wouldn’t make a Mark II version if you couldn’t hear a difference.

You can order these valves singly, the power valves as matched quads or a complete kit. However, we strongly urge you to change all your valves at the same time.

It’s the cheapest way of getting your amp sounding its very best.

Order your valves below and hear the difference.

So restore the tone, the power and the sparkle to your guitar amplifier. Treat yourself to a brand new set of valves today.

All of our valve kits are carefully selected, fully tested, digitally balanced and matched.
We offer a variety of shipping options with full tracking and insurance so you can order with confidence.
We have 30 years experience so you know you are in safe hands.
International shipping – we post all over the world every single day.

Replace the Valves on your Marshall JCM800 Super Bass Series amplifier.

If you have any queries about replacing your valves please get in touch. We have over 30 years of experience so one of our team will always be happy to help and advise.

Also, we recommend that you take a look at our FAQ section where we answer the most popular questions we get asked each week. You will also find lots of useful tips if you are new to upgrading your tubes.

If you want to know what your shipping options are, simply add the product to the basket and when you get to the check out it will show you delivery costs, options and delivery times.

About the amp

The JCM 800 Series was launched in 1981. As the name suggests it was not one amp but a complete series comprising both lead and bass amps. As mentioned above, the standard power valve set fitted was 4 x EL34, but some amps were fitted with 4 x 5881 power valves instead. So take a quick look inside your amp before ordering.