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02/05/25 at 08:55:28

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UFO25 Keeps Blowing Fuses (Read 495 times)

HiFi Bri

Senior Member

Posts: 78

UFO25 Keeps Blowing Fuses
11/29/24 at 23:56:45

Hi All,

When I tried turning my amp on today, it lit up quickly then shut off. I removed the fuse and noticed it was blown.

Having read the support manual, I removed the rectifier tube, put in a new fuse, and tried powering up again. Same thing: the amp's meters lit up very briefly and then everyting turned off. Again, the new fuse was blown.

I've had this amp plugged into a power strip with no previous issues, and there weren't any power outages or anything like that.

I'll contact Steve after the holiday weekend but until then, does any one have any ideas?

Thanks!

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CAJames

Seasoned Member

"I've run every
red light on memory
lane."

Posts: 2279

Re: UFO25 Keeps Blowing Fuses
Reply #1 - 11/30/24 at 00:55:37

Quote:

Posted by: HiFi Bri Posted on: Today at 15:56:45

...Having read the support manual, I removed the rectifier tube, put in a new fuse, and tried powering up again. Same thing: the amp's meters lit up very briefly and then everyting turned off. Again, the new fuse was blown.

IMO there are two likely scenarios: one is another of the tubes has shorted, so you can try replacing all the other tubes and power it up again without the rectifier. The other, unfortunately, is something serious and I would wait for Steve in that case.

[FOOBAR2000 | Jay's CDT2 MRK3] -> Denafrips Terminator 2 + Gaia
Sumiko Pearwood -> Mapleknoll Athena -> Luxman SUT -> Mapletree Phono 3E
STR-1002 -> Woo WA22 -> 2x UFO25s, balanced monos
Omega SAM , Hifiman Arya, Audeze LCD-XC

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HiFi Bri Senior Member Posts: 78	Re: UFO25 Keeps Blowing Fuses Reply #2 - 11/30/24 at 01:08:40 Unfortunately, it may be the more serious thing. I swapped out all tubes (except for the x2 voltage regulator tubes in the back) and same issue. There's also an audible buzz to the amp when I switch it on right before it all shuts down. Damn.
Back to top	Rega P10 \| Aphelion 2 \|Darlington Labs MP8B + SU-7 \| ZRock2 w 25th Ann \| SE84UFO25 w/ Attenuators \| Decware I/Cs and Pwr Cbls \| ZSTYX Speaker Cbls \|Omega Alnico Towers \| x2 Omega Deep Hemp Subwoofers \| Butcherblock Acoustics RigidRack IP Logged

CAJames Seasoned Member "I've run every red light on memory lane." Posts: 2279	Re: UFO25 Keeps Blowing Fuses Reply #3 - 11/30/24 at 01:24:23 Sorry for your loss. Hopefully Steve has better ideas than I do.
Back to top	[FOOBAR2000 \| Jay's CDT2 MRK3] -> Denafrips Terminator 2 + Gaia Sumiko Pearwood -> Mapleknoll Athena -> Luxman SUT -> Mapletree Phono 3E STR-1002 -> Woo WA22 -> 2x UFO25s, balanced monos Omega SAM , Hifiman Arya, Audeze LCD-XC IP Logged

CAJames Seasoned Member "I've run every red light on memory lane." Posts: 2279	Re: UFO25 Keeps Blowing Fuses Reply #4 - 12/09/24 at 18:13:06 Curious if you got a diagnosis and/or solution for this?
Back to top	[FOOBAR2000 \| Jay's CDT2 MRK3] -> Denafrips Terminator 2 + Gaia Sumiko Pearwood -> Mapleknoll Athena -> Luxman SUT -> Mapletree Phono 3E STR-1002 -> Woo WA22 -> 2x UFO25s, balanced monos Omega SAM , Hifiman Arya, Audeze LCD-XC IP Logged

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