KT88 Valve – JJ Single Valve NEW AND TESTED (1 x KT88)

1 x KT88 Power Valve


In Stock

500 in stock

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.


Single KT88 Power Valve

Are you looking to buy a single KT88 power valve for your guitar amplifier or hi-fi system?

We sell the awesome JJ KT88 power valve/power tube. JJ is one of only five manufacturers of valves in the world. So don’t pay more for rebranded versions of exactly the same valve in a different box.

  • All of our power valves are carefully chosen, fully tested and digitally graded before we ship to you.
  • These Selected Premium Grade JJ valves deliver superior tone, power and performance.
  • We offer a range of fast delivery options with full tracking and insurance.
  • We have 30 years in the business so you can order with total confidence.
  • Global shipping – we ship all over the world.

Do these KT88 power valves need to be matched?

Yes, if you buy more than one.

In a guitar amplifier with two output valves, one valve is “pushing” the speaker cone while one is “pulling” it. So, in an amp with four output valves, the same applies but the amp has twice the power.

With the same signal applied to each valve, it’s important that each valve gives an identical amount of push or pull. If this was not the case, sound fidelity and tone would be lost.

So you MUST replace both output tubes at the same time. At AmpValves we carefully select, test, grade and digitally match all stock before we ship to you.

A matched pair of KT88 power tubes means each tube gives the same bias current under identical conditions of plate voltage and grid bias voltage. Please note that valves (even the same make and same model) can differ significantly in their characteristics. So this is why matching the valves is so important.

You can purchase a matched pair of KT88 valves here.

1 x JJ KT88 Power Valve/Power Tube

The KT88 tube is a much sought after guitar amplifier valve.

It is highly regarded by guitarists around the world. The only reason that more amplifier manufacturers don’t use them is to keep down the costs, which is a real shame.

Which guitar amplifiers do the KT88 valves fit?

These superb amplifier valves fit many different guitar amplifiers produced by a variety of different manufacturers. KT88s have a very specific sound so please check the exact valves you need for your particular amplifier by clicking here.

These valves are also used in a wide range of valve powered hi-fi equipment.

Additional information

Weight0.31 kg
Dimensions15 × 15 × 15 cm


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1 x KT88 Power Valve

KT88 Valve – JJ Single Valve NEW AND TESTED (1 x KT88)