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From: William Sommerwerck on 29 Jun 2010 19:36
My gut feeling is that the owner is simply smelling "burning dust". But he
should stop using it immediately, and have someone look it over. It might
need only a thorough vacuuming.


From: Cydrome Leader on 29 Jun 2010 20:52
David Nebenzahl <nobody(a)but.us.chickens> wrote:
> Got someone with a Kyocera receiver (R-851, 85 w/chan.) that they say
> "smells like something's burning". Don't have more specific information
> than that; I'm assuming no magic smoke is visible. I'm advising them
> that perhaps something (dust, etc.) is in the heat sink that's getting
> heated and smelling. Apparently the output stages (MOSFET) of these
> beasts tend to run on the hot side.

weird heatsink in that thing:

http://www.audiokarma.org/forums/showthread.php?t=246095
From: Meat Plow on 30 Jun 2010 10:26
On Wed, 30 Jun 2010 00:52:12 +0000, Cydrome Leader ǝʇoɹʍ:

> David Nebenzahl <nobody(a)but.us.chickens> wrote:
>> Got someone with a Kyocera receiver (R-851, 85 w/chan.) that they say
>> "smells like something's burning". Don't have more specific information
>> than that; I'm assuming no magic smoke is visible. I'm advising them
>> that perhaps something (dust, etc.) is in the heat sink that's getting
>> heated and smelling. Apparently the output stages (MOSFET) of these
>> beasts tend to run on the hot side.
>
> weird heatsink in that thing:
>
> http://www.audiokarma.org/forums/showthread.php?t=246095

I've seen many of those in different pro power amps.
From: Chuck on 30 Jun 2010 11:28
On Tue, 29 Jun 2010 12:54:13 -0700, David Nebenzahl
<nobody(a)but.us.chickens> wrote:

>Got someone with a Kyocera receiver (R-851, 85 w/chan.) that they say
>"smells like something's burning". Don't have more specific information
>than that; I'm assuming no magic smoke is visible. I'm advising them
>that perhaps something (dust, etc.) is in the heat sink that's getting
>heated and smelling. Apparently the output stages (MOSFET) of these
>beasts tend to run on the hot side.
>
>Question: does anyone know what kind of overcurrent or overtemperature
>protection this unit has? User is concerned about "ruining" it if it is
>in fact overheating (which I can't determine at this distance). They're
>running it with 4-ohm speakers at not-very-high levels; I also suggested
>trying it with 8-ohm speakers and seeing if the smell lessens.
>
>Not much info to go on, I know, but I really would like to know more
>about any protection circuitry in this piece of gear.


This unit doesn't have thermal protection but it has a DC offset
protection. This model was extremely reliable but I repaired one that
had both amplifiers completely wiped out. Even though I told the
customer I wouldn't void his warranty if he told me how he managed to
accomplish this feat, he wouldn't divulge what he did.
From: William Sommerwerck on 30 Jun 2010 11:58
> This unit doesn't have thermal protection but it has a DC offset
> protection. This model was extremely reliable but I repaired one that
> had both amplifiers completely wiped out. Even though I told the
> customer I wouldn't void his warranty if he told me how he managed to
> accomplish this feat, he wouldn't divulge what he did.

Plugged the speaker outputs into an AC wall socket?

I had an amplifier with DC offset protection, in which the amplifier failed,
and the protection failed, at the same time, an incredibly unlikely
coincidence. The DC damaged one of my speakers.


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