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If it doesn’t have a suitable transformer, you will either need to use an external step-down transformer (also about £50 for a decent quality one if the amp isn’t very low-powered), or have the amp’s own power transformer replaced with the ‘export’ version - this is a bigger job and more expensive, I would allow £100-£200 depending on the size and cost of the transformer.
If the amp is old and has a 2-wire non-earthed power cable this will need to be replaced as well, and the ‘death cap’ inside removed.
No, that is too low power-rated for all but the very smallest amps and doesn’t have an earthed output.
For most guitar amps you will need at least a 200VA transformer (for an amp up to about 50W), 300VA or 500VA (for up to 100W amps) - check the amp’s power draw rating - and it must have an earthed output socket (3 holes, but make certain it does genuinely have an earth connection and not just a blank hole).
Something like this - https://www.cricklewoodelectronics.com/230V-to-110V-UK-to-USA-Mains-Auto-Transformer-300VA.html
"Take these three items, some WD-40, a vise grip, and a roll of duct tape. Any man worth his salt can fix almost any problem with this stuff alone." - Walt Kowalski
"Only two things are infinite - the universe, and human stupidity. And I'm not sure about the universe." - Albert Einstein
• Youtube - https://www.youtube.com/@Goldeneraguitars
Some vintage purists might disagree with even doing this, but it’s important to remember that almost all stepdown transformers are autotransformers and not isolating transformers, so the amp is still directly connected to the mains and hence dangerous unless earthed.
"Take these three items, some WD-40, a vise grip, and a roll of duct tape. Any man worth his salt can fix almost any problem with this stuff alone." - Walt Kowalski
"Only two things are infinite - the universe, and human stupidity. And I'm not sure about the universe." - Albert Einstein
It's a bit OTT at 500VA - because I use it for any/all US amps up to 100W output, and I prefer things to run cooler for longevity.
And I added that rather fat-sized three-pin plug with three-wire cable for proper grounding, when the amp had only a two-wire cable.
https://www.instagram.com/insta.guitarstuff/
"Take these three items, some WD-40, a vise grip, and a roll of duct tape. Any man worth his salt can fix almost any problem with this stuff alone." - Walt Kowalski
"Only two things are infinite - the universe, and human stupidity. And I'm not sure about the universe." - Albert Einstein
https://www.instagram.com/insta.guitarstuff/
https://www.tubeampdoctor.com/en/parts-for-amplifiers/transformers/mains-transformers/mains-transf.-for-mesa-boogie/
Does it have to be the 'exact' one? or surely one with the same specification would work.
https://www.instagram.com/insta.guitarstuff/
"Take these three items, some WD-40, a vise grip, and a roll of duct tape. Any man worth his salt can fix almost any problem with this stuff alone." - Walt Kowalski
"Only two things are infinite - the universe, and human stupidity. And I'm not sure about the universe." - Albert Einstein
I'll see if I can think of a way of safely testing this...
"Take these three items, some WD-40, a vise grip, and a roll of duct tape. Any man worth his salt can fix almost any problem with this stuff alone." - Walt Kowalski
"Only two things are infinite - the universe, and human stupidity. And I'm not sure about the universe." - Albert Einstein