Marshall ST20H Studio JTM MKII Amp Head

Marsoni

M251S

$729.50

Get it in 3 business days with 1 day shipping. Friday, May 29

Marshall ST20H Studio JTM MKII Amp HeadUK Made all tube Head. This is Marshall's faithful reproduction of the warm and smooth tones of the original Marshall JTM, in a new, adaptable and convenient head. The ST20H allows you to switch between 20W and 5W with the flick of a switch, making it perfect for delivering that classic JTM sound either at home, the studio, or on the stage. SPECS 2 x 1558 power amp tubes 2 x ECC83 preamp tubes 1 x ECC83 phase splitting tube 5 1 4" Jack sockett outs

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Definitely better than the old plugs that probably had 80k miles on them. The one star off is because I had a misfire after installing. Not sure if I damaged the plug or what, but a reinstall didn't fix the misfire. In my genius, I rushed to try to gap it and ended up breaking the iridium tip. Put the old plug into cylinder 3 (where the misfire was) and it was fine. Gonna have to get a new single tomorrow at my local shop, but a bit frustrating to get a misfire after install.

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Reviewed in the United States on April 27, 2026

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Britincali

Lowell, US

★★★★★ 5

Upgrade from OEM

After seeing a quite ludicrous $403 quote to change 4 spark plugs in a Mazda3 I decided to show my son how easy it is. These were an upgrade from OEM parts. They were gapped perfectly for the car. They took 20mins to fit and work fine.

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Reviewed in the United States on February 11, 2026

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ANDRES FIGUEROA

Lake Worth, US

★★★★★ 5

Very good

The best quality. Runs like new again.

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Reviewed in the United States on March 12, 2026

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Ale

Los Angeles, US

★★★★★ 1

garbage spark plugs

misfired after 30 minutes of driving cylinder 4 misfire code, left me stranded on the highway with baby in car. “(9621)” at the end of description is a lie, was not compatible with my vehicle even with compatibility test.

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Reviewed in the United States on May 17, 2026