2 x 5U4GB JJ Rectifier Valves

2 X 5U4GB Rectifier Valves


In Stock

420 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 2 x 5U4GB rectifier valves? Look no further!

Valves like the 5U4GB rectifier pair, are used in a large number of vintage and reissue guitar amplifiers.

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

These 5U4GB rectifier pair have a thick glass envelope and extremely robust electrodes. This makes this pair the perfect workhorse for those guitar amplifiers which use a 5U4GB rectifier pair.

2 x JJ 5U4GB rectifier valves for sale
2 x JJ 5U4GB rectifier valves for sale

So why Use a 5U4GB rectifier pair?

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 continued 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 hundreds of thousands of vintage amplifiers out there which use rectifier tubes.

So now you know!

2 x JJ 5U4GB rectifier valves for sale

If you have any questions please drop us an email. One of the team will get straight back to you.

You can buy these valves as singles or as a pair.

Additional information

Weight0.29 kg
Dimensions15 × 15 × 15 cm


There are no reviews yet.

Be the first to review “2 x 5U4GB JJ Rectifier Valves”

Your email address will not be published. Required fields are marked *

Order now:
2 X 5U4GB Rectifier Valves

2 x 5U4GB JJ Rectifier Valves


Scroll to Top