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"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've not had much success repairing these either to be honest; nor have I had much technical support either from Ampeg, although this may change now Ampeg are owned by Yamaha.
https://www.talkbass.com/threads/ampeg-pf-500-fuse-problem.927210/
Is this worth having a go at?
I hope so! I've always found Yamaha pretty helpful.
"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
10 Amp T10AH 250V 20mm x 5mm Ceramic Fuse x 2 by electrosmart® https://www.amazon.co.uk/dp/B004Z0NNFK/ref=cm_sw_r_cp_apa_FsTABbDB85514
Edit: Or is this better?
https://m.ebay.co.uk/itm/5-CERAMIC-SLOW-BLOW-FUSES-10A-10AMP-T10AH-20-x-5mm-250V-/121585109684
The one in the dead one I still have here is a clear glass fuse, not ceramic - it shouldn't make any difference for this application though.
"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
Edit: these?
https://www.amazon.co.uk/dp/B01MSDFXJX/ref=cm_sw_r_cp_apa_U6TABb1EED524
Also, I haven't taken it apart yet; is it fairly obvious where this fuse is located?
Yes, it's in the corner near the power socket.
I've also just checked that the illuminated switch comes on even if the fuse is blown - it does.
"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
Opened it up to check the fuse. Fuse is fine.
Noticed this:
https://i.imgur.com/0qlkSft.jpg
Pushed back on, now powers up!
It may be worth putting a small amount of hot-melt glue or silicone on the connector to stop it coming off again.
"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