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From: William Sommerwerck on 11 Aug 2010 17:52
> The fuses sat right in the centre of the power amplifier
> print. [???] I would guess protection of the output stage.
> The mains fuse was OK. The set is still playing.

Driving a low-impedance speaker at high volumes can cause this. (I had it
happen once.)

LET ME REPEAT, because no one seems to be paying attention. A fuse (or
fuses) can pop for no /obvious/ reason. It doesn't mean the amplifier is
defective, or that the fuses are likely to blow again. This sort of thing
happens every day, and is nothing to worry about. *

If it /keeps/ happening, /then/ you have to find out why. Otherwise, don't
worry about it.

The last time this happened to me was about nine months ago. I accidentally
knocked the power cord out of an amplifier's AC socket. In putting it back,
I didn't push the connector in quickly and firmly enough, and the amplifier
"chattered" on and off. The inductive kickback generated enough current to
blow the AC fuse. This was completely normal, one of the reasons electronic
equipment is fused.

* I once serviced a ReVox open-reel tape deck that kept blowing its fuse.
The fuse popped every three or four times the unit was turned on. I watched
the fuse during turn-on, and saw it flex as it heated up from the inrush
current. After a few flexes, it broke.

Though it appeared to be the correct fuse for this deck, I decided to
replace it with a slow-blow fuse of slightly higher capacity (about a half
ampere, IIRC). The customer was happy, and as far as I know, the deck didn't
explode and his house didn't burn down.


From: Keith Thrasher on 12 Aug 2010 19:27
On Wed, 11 Aug 2010 01:54:53 +0200, Sjouke Burry wrote:

> Now fuses dont blow just to surprise you.
>
> So, how did the former owner manage to blow both?

I showed him how. Purse your lips...
--
I have multiple DUIS, beat my kids, paid $360K for a house worth $275K
got handed a divorce and a Restaining Order to keep away from all of
them. I'm 36, got a beer belly that looks like I'm pregnant 9 months.
Gawd, isn't life good!
From: Paul Hovnanian P.E. on 13 Aug 2010 13:59
Sjouke Burry wrote:

[snip]

> The fuses sat right in the centre of the power amplifier print.
> I wold guess protection of the output stage.
> The mains fuse was oke.
> The set is still playing as I type this.

Speaker leads shorted once upon a time?

--
Paul Hovnanian paul(a)hovnanian.com
----------------------------------------------------------------------
Have gnu, will travel.
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