In the beginning of this video Michaels tech says "He likes the old 800s" while he is pointing at a Marshall JCM800.

John Norum first recorded and toured with a JCM800 2205 when he recorded "The Final Countdown" with Europe in 1986 and toured with them a year afterwards, before leaving the group. They have been his main amps throughout his solo career and he's still using them when touring and recording with the reunited Europe, as can be seen in the 2004 rig rundown video.

"I only use 50 watts because I think they sound... they sing a little bit more than 100 watts, and you don't have to kill the rest of the band with the volume and stuff like that - they think it's pretty loud anyways"

"I have two JCM800s that I brought from USA. They aren’t S-certified (a security certification for electric products from Sweden). They have a volt switch between 110, 220 and 240 and also 4,8 and 16 ohm. The Swedish ones has only 4 and 8 ohm. I usually put them on 240 volts and 16 ohm"

Otherwise, they're completely stock except for John having changed the tubes from EL34s to KT88s, in vein of Richie Blackmore and Mick Ronson.

John can be seen talking about the amps 3:00 into the video.

Fun fact: one of John's 2205s has previously been owned by his idol Michael Schenker, and Norum refused to sell it back when Schenker regretted parting with it!

In the live performance video "Brant Bjork | Live at dunajam 2025 (full concert)" on YouTube, Brant Bjork is seen using the Marshall JCM800 2205 50-Watt Amplifier Head on stage, as documented by the source author quadorb.

Dude, I can't remember; it was almost everything. And we used an old Fender Bassman on a lot of stuff. And an old 50-watt JCM800 and a couple of crazy boutique amps; I found these really bizarre boutique amps.

Ultimate Guitar interview, 2010.

According this article, Gaz Coombes used, "...a Marshall — an old JCM800, you know, a pure valve one, without any of the busy bits on that they put on them nowadays. You had two inputs and four valves. We've still got it now. Fantastic amp."

Thinking back to the tone Ric had on those early Cars records, I listened to a few Marshalls myself and the one that sounds the closest to what Ric was using at that time to my ears is the Marshall JMP 2230 50 watt JCM800 - which was amongst the most popular amplifiers in use by most professional rock groups of the period.

"Guitars? My favorite ones are always Gibsons. Fenders like the Jaguar I'll use on stuff like 'My Best Friend's Girl.' clicky stuff where I'm lust playing eighth notes. The Gibsons I like for more distorted, bigger, raw kinds of sounds." One of them is a '54 Fretless Wonder; the others arc mostly late 50s and early 60s Les Paul' TV models he picked up on various Cars tours. Curiously, Ocasek's guitars all come in red, white or black finishes except for a lone acoustic Martin. "I can't use a guitar with a natural finish. I don't like the look of wood guitars." Whatever their color, they all go through a 50-watt Marshall amp. Everything else is plugged straight into the board.

"My go-to heavy sound is from a Marshall JCM800 50-watt head that I’ve had for years. Live, I always run two Fender-type amps—or Vox-type or Orange or Silvertone—flanking a JCM800. On this last tour in Europe, I had an AC30 on one side and a Deluxe Reverb on the other."

You can see the amp head since the min 0:35 from Rio 2017

Peter Mengede is associated with the Marshall JCM800 2205 50-Watt Amplifier Head, as noted in the Guitar Lessons Brisbane section of the Sunnybank Studios website.

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

Vaden talks about the amp at 9:40, you can clearly see it says:
“JCM 800 Series.”

"My other amps include a 1966 Fender Vibrolux, 1982 Marshall JCM800 50-watt head, 1964 Vox AC10, 1964 Vox AC30 TB, Magnitone 280, and 1960 Fender Vibroverb."