5U4GB JJ Rectifier Valve

5U4GB Rectifier Valve


Price Includes Free UK Delivery

414 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.


Are you looking to replace your 5U4GB rectifier tube? Look no further!

Rectifier valves, like the 5U4GB, are used in a large number of vintage and reissue guitar amplifiers.

We sell a superb example of the 5U4GB rectifier made by JJ Electronics. JJ is one of only five valve manufacturers in the World.

This version has a thick glass envelope and extremely robust electrodes. This makes it the perfect workhorse for those guitar amplifiers which use tube rectification.

In fact, it’s become quite chic to add a rectifier tube to a new guitar amplifier design. Guitarists just love that ‘retro’ feel!

So why Use a Valve Rectifier such as the 5U4GB?

Well, the first thing to realise is that the rectifier valve is NOT in the signal chain. It’s there simply to change AC to DC, a process known as rectification.

The reason rectifier valves are still used is interesting. They are actually not that great at doing the job they are intended to do! That is, change AC to DC. If the amplifier is loaded, by say a heavy power chord from your trusty Les Paul, the DC will ‘sag’. This is because the rectifier simply can’t keep up. In contrast, a diode rectifier will barely sag. (sagging means the DC voltage drops before recovering.) But here’s the thing. Guitarists have come to like this effect, hence the demand for valve rectification.

And of course, back in the day, there were no decent solid-state rectifiers. So the 5U4GB and similar types were the only game in town. There are still tens of thousands of vintage amplifiers out there which use rectifier tubes.

So now you know!

If you have any questions drop us an email.

Additional information

Weight0.052 kg
Dimensions13 × 13 × 13 cm


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5U4GB Rectifier Valve

5U4GB JJ Rectifier Valve