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Old 10th January 2013, 04:05 PM   #1
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Question leak st20

Hi all, just aquired a leak st20 that has been overhauled about a year ago by classique sounds and after ahving a look over amp, noticed the input fuse at rear is a 10A, not a 2A as shown on the original circuit diagram?
The amp is apparently being run in triode mode, can anyone confirm if this fue should be changed back to a 2A?
thanks
tom.
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Old 10th January 2013, 04:23 PM   #2
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Location: wigan
Hi Tom..
A 10 amp fuse does seem very high. Why not give classique a call or email and ask what fuse they recommend. Could always replace with a 2 amp and see if it holds out.

Regards Mark
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Old 10th January 2013, 05:01 PM   #3
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Hi, thanks for reply, yes will call them as it does seen much higher than original spec? I can see no reason for this much higher rated fuse?
Thanks,
Tom
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Old 10th January 2013, 05:28 PM   #4
DF96 is offline DF96  England
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Perhaps what someone happened to have in the parts bin?
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Old 10th January 2013, 06:03 PM   #5
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Possibly, tried classique sounds earlier but no answer, not firing up amp till next week when my passive pre is ready, so got some time to sort correct fuse. Does the fuse protect the transformers? Any ideas as I'm a newbie to this amp and tubes in general?
Thanks again
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Old 10th January 2013, 06:16 PM   #6
DF96 is offline DF96  England
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A fuse protects the things near it in the circuit, especially things just upstream from problems just downstream. A fuse in the mains input may protect the cable from a transformer or switch short. In the UK the plug fuse will do the same, and also protect the cable itself from cable shorts. The right fuse may give some limited protection to the transformer from wiring shorts in the secondary circuit.

A 10A fuse may stop a switch short from completely frying the cable, but that is about all it will do.
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Old 10th January 2013, 06:28 PM   #7
GoatGuy is offline GoatGuy  United States
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Why not replace with a 2A fuse, then power it all up? There are ONLY 2 outcomes! It works, or it blows.

If it blows, you have research to do.
If it works, you're good to go, and you can keep moving forward.

Other than protect from sustained (and transient) over-current use, fuses do nothing else (ideally) to the sound of the system. Though... it is amusing to see people buy cryogenically cured single-crystal oxygen-free (99.99995%) power cables to hook their house wiring (all crap) and power socket (more crap) to their uber-high-end audio system ... which for all that, has a nice little 1/10th ohm fuse made of (crap) low-melting point, medium-conductance alloy in series with the power line. LOL.

GoatGuy
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Old 10th January 2013, 06:30 PM   #8
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Hi, I would have thought the plug fuse protects the cable, and this 10A fuse protects the circuits inside the amp, without a schematic to hand I'm unsure to be truthful?
Thanks
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Old 10th January 2013, 07:33 PM   #9
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Hi, yes your right goatguy, although its not a standard British fuse as found in uk type plugs, it looks slightly longer and narrower, I'll try Rs or maplins to see what they've got.
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Old 10th January 2013, 07:44 PM   #10
DF96 is offline DF96  England
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The amp fuse is probably a 1.25" (also known as 32mm), whereas UK mains plugs use 1".
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