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Author Topic: 34 years of faithful service  (Read 5164 times)

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jereboam

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34 years of faithful service
« on: 27 December 2009, 17:55:52 »
My amplifier stopped working.  Just like that - no bang, no smoke, no flames.  It just stopped.  Checked the fuse - it had blown.  Zoomed into town and just caught Maplins as they were closing.  Replaced fuse.  Blew immediately - no surprise there. 

Anyone got any suggestions?  I'm reasonably competent with a soldering iron, and I've got a multimeter.  What I haven't got is enough money to buy a new one.   :'( :'( :'(
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STMO999

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Re: 34 years of faithful service
« Reply #1 on: 27 December 2009, 18:30:24 »
Sorry I cant help J, but I'm sure someone will take the piss help you soon.
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Marks DTM Calib

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Re: 34 years of faithful service
« Reply #2 on: 27 December 2009, 18:49:50 »
Come on, give us a clue....you have an old amp thats stopped working and its blowing fuses....

Make
Model
Type
Which fuse


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STMO999

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Re: 34 years of faithful service
« Reply #3 on: 27 December 2009, 18:57:39 »
Probably the pins on a valve shorted out. ;D
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STMO999

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Re: 34 years of faithful service
« Reply #4 on: 27 December 2009, 19:02:29 »
He must be having his nap.
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Omegadoha, Desert Member

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Re: 34 years of faithful service
« Reply #5 on: 27 December 2009, 19:03:13 »
Probably has vintage value that amp.
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Marks DTM Calib

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Re: 34 years of faithful service
« Reply #6 on: 27 December 2009, 19:04:59 »
Chances are that if its the mains fuse it could be a possible dead rectifier diode/bridge
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STMO999

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Re: 34 years of faithful service
« Reply #7 on: 27 December 2009, 19:08:03 »
Quote
Chances are that if its the mains fuse it could be a possible dead rectifier diode/bridge


On something that age, it could be as simple as a worn power flex shorting out, but I'm no good at long distance diagnostics.
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Mr Skrunts

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Re: 34 years of faithful service
« Reply #8 on: 27 December 2009, 19:15:18 »
Quote
Quote
Chances are that if its the mains fuse it could be a possible dead rectifier diode/bridge


On something that age, it could be as simple as a worn power flex shorting out, but I'm no good at long distance diagnostics.

Just thinking the same thing.
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Marks DTM Calib

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Re: 34 years of faithful service
« Reply #9 on: 27 December 2009, 19:19:37 »
Lol, I am hoping said person is not quite so stupid to of not checked,

I have to say that I dont agree with the 2 of you, if it was an iron, vaccum or something that was often moved, wound etc then yes.

Plus mid seventies the plastics were reasonably ok.
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STMO999

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Re: 34 years of faithful service
« Reply #10 on: 27 December 2009, 19:22:28 »
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Lol, I am hoping said person is not quite so stupid to of not checked,

I have to say that I dont agree with the 2 of you, if it was an iron, vaccum or something that was often moved, wound etc then yes.

Plus mid seventies the plastics were reasonably ok.

Only said 'could be'. It 'could be' a good few things.
I doubt we'll ever know.
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jereboam

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Re: 34 years of faithful service
« Reply #11 on: 27 December 2009, 19:32:56 »
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He must be having his nap.

No - I was off doing the IQ test.

Did that OK, but can't remember my username/password for the AVforums. :( :(
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Debs.

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Re: 34 years of faithful service
« Reply #12 on: 27 December 2009, 19:43:52 »
Quote


On something that age, it could be as simple as a worn power flex shorting out, but I'm no good at long distance diagnostics.

.......Heater, Cathode, Grid, Anode......or insufficient vacuum! :P
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STMO999

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Re: 34 years of faithful service
« Reply #13 on: 27 December 2009, 19:47:42 »
Quote
Quote


On something that age, it could be as simple as a worn power flex shorting out, but I'm no good at long distance diagnostics.

.......Heater, Cathode, Grid, Anode......or insufficient vacuum! :P


You forgot the top cap.
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jereboam

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Re: 34 years of faithful service
« Reply #14 on: 27 December 2009, 19:49:36 »
OK

It's a Sansui AU4400, and it was the 1.5A case-mounted fuse which blew.  As far as I remember, its rated at about 30w RMS per channel.  Shouldn think it's got any valves in it, but from the 1975 vintage, I'd guess it's mostly discrete components.

It's unlikely to be the external connections, as nothing else in the stack has been affected. 



Beautiful!
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