Declan Mehrtens

In a Noisegate article, Declan Mehrtens discusses using the Blackstar HT-100 Stage as his main amplifier.

In this youtube video, we can see the amp in the back of Declan at 22:15, I'm not sure if this is a 50 watt head, it looks like a 100 watt head but I can't find it in the equipboard's list

In a video by Premier Guitar titled "Amyl and the Sniffers' Declan Martens Rig Rundown Guitar Gear Tour," Declan Mehrtens discusses using Marshall JCM800 1959 Mk II Super Lead amplifier heads, which the band rents for tours. This information is mentioned at the 7:20 mark.

In the video titled "Amyl and the Sniffers' Declan Martens Rig Rundown Guitar Gear Tour" by Premier Guitar, guitarist Declan Mehrtens discusses using two Marshall 1960A 4x12'' cabinets on tour at the 8:20 mark.

In a video by Premier Guitar titled "Amyl and the Sniffers' Declan Martens Rig Rundown Guitar Gear Tour," guitarist Declan Mehrtens discusses using the Marshall 1960B 4x12'' Cabinet while on tour with Amyl and the Sniffers.

According to a Rig Rundown with Premier Guitar, guitarist Declan Mehrtens uses a Hiwatt Custom 100 Amplifier Head, which he discovered in Foo Fighters' studio, alongside his "beloved" Marshall JCM800.

Declan Mehrtens is revealed to run his "beloved" Marshall JCM800 into a pair of Marshall 1960BX speaker cabinets in this article from Premier Guitar.

At 8:56 in the YouTube video "Amyl and the Sniffers Rig Rundown with Declan Mehrtens & Gus Romer" by Premier Guitar, guitarist Declan Mehrtens is shown using a Hiwatt DR103 Custom 100 as part of his amp setup.

In a video by Premier Guitar titled "Amyl and the Sniffers Rig Rundown with Declan Mehrtens & Gus Romer," guitarist Declan Mehrtens is seen using a Marshall JCM800 Modified 100-watt Tube Head as part of his amplifier setup at the 8:56 mark.