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The following page was printed from RemoteCentral.com:
| Topic: | Fuse for old amp This thread has 8 replies. Displaying all posts. |
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| Post 1 made on Monday February 13, 2017 at 14:51 |
netarc Senior Member |
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Posts: | May 2004
1,348 |
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I’ve got a client who blew a fuse on an old, 80s era audio power-amplifer, an SAE A201; the fuse is an “MDX 5” (5 amp, 125 V), yet he’s not been able to find a source, online or local, that sells the fuse.
Any leads on where one could obtain this fuse?
Thank you!
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| Post 2 made on Monday February 13, 2017 at 15:13 |
Impaqt RC Moderator |
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Posts: | October 2002
6,230 |
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MDA-5 is a direct replacement. 5a is 5a whether its 125v or 250
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| OP | Post 3 made on Monday February 13, 2017 at 15:31 |
netarc Senior Member |
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Posts: | May 2004
1,348 |
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thank you! We'll also reach out to ATI, who is apparntly now making SAE amps
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| Post 4 made on Monday February 13, 2017 at 17:12 |
tomciara Loyal Member |
Joined:
Posts: | May 2002
7,962 |
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The voltage is not important. The current rating and the physical size of the fuse of the governing factors. Sometimes the auto parts store has fuses, sometimes the RadioShack will have something like that.
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There is no truth anymore. Only assertions. The internet world has no interest in truth, only vindication for preconceived assumptions. |
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| Post 5 made on Monday February 13, 2017 at 18:03 |
highfigh Loyal Member |
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On February 13, 2017 at 17:12, tomciara said...
The voltage is not important. The current rating and the physical size of the fuse of the governing factors. Sometimes the auto parts store has fuses, sometimes the RadioShack will have something like that. Or an auto parts store.
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My mechanic told me, "I couldn't repair your brakes, so I made your horn louder." |
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| Post 6 made on Monday February 13, 2017 at 18:04 |
highfigh Loyal Member |
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Posts: | September 2004
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On February 13, 2017 at 14:51, netarc said...
I’ve got a client who blew a fuse on an old, 80s era audio power-amplifer, an SAE A201; the fuse is an “MDX 5” (5 amp, 125 V), yet he’s not been able to find a source, online or local, that sells the fuse.
Any leads on where one could obtain this fuse?
Thank you! Buy a few and disconnect the speaker wires from the amp before turning it on- if the fuse blows then, it could point to the power supply or the output section.
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My mechanic told me, "I couldn't repair your brakes, so I made your horn louder." |
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| Post 7 made on Monday February 13, 2017 at 19:53 |
buzz Super Member |
Joined:
Posts: | May 2003
4,371 |
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[Link: monsterfuses.com][Link: onlinecomponents.com]These fuses are designed for heavier inrush current that would be typical for small motors or the main fuse for a big amplifier. A truly fast blow fuse probably would not last very long in such applications because repeated starts will fatigue the fuse, but you might be able to use a fast blow for a few tests. If the glass is seriously blackened, amplifier failure is likely and you should check for output transistor shorts and similar before applying power. This will minimize overall damage. After a while one can begin to "read" fuses. If I see a unit with a seriously blown fuse, I won't apply power until I have repaired the unit. The first time that I power up, the unit will be operating correctly. If the glass simply has a small, pale silver stripe, the unit is likely OK and the fuse is being a pain in the neck or incorrectly specified by the designer. I've seen units that would blow the main fuse every few months and there was nothing wrong -- someone specified the wrong fuse. It could have been an inexperienced designer or a purchasing agent who got a deal on a cheaper fuse. All 5A fuses are the same, right? (Not!)
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| Post 8 made on Tuesday February 14, 2017 at 00:32 |
tomciara Loyal Member |
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Posts: | May 2002
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On February 13, 2017 at 17:12, tomciara said...
Sometimes the auto parts store has fuses, sometimes the RadioShack will have something like that. On February 13, 2017 at 18:03, highfigh said...
Or an auto parts store. Is there an echo in here?
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There is no truth anymore. Only assertions. The internet world has no interest in truth, only vindication for preconceived assumptions. |
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| Post 9 made on Tuesday February 14, 2017 at 05:30 |
thecapnredfish Senior Member |
Joined:
Posts: | February 2008
1,397 |
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Ernie? Retro is right up your alley. Or Reynolds wrap the old, put that bad boy outside, plug it in and let er rip.
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