The Brimar PX4 oriental has been selected as the only tube that fulfils the audio requirements fairly close to the original. Although the bulb is different and the internal build is quite unusual, the sonic capability is really very good. To keep with modern base availability a UX4 base is used and the electronic “workings” of this valve are quite similar to the original and give the user the opportunity to continue using their classic audio amplifiers.

As the price of original PX4’s are well into the high hundreds of pounds we hope that this offering will keep these classic amps alive until we resume the original design expected late 2022. (please note they are only sold in very closely matched pairs).