Champ guitar amp;

Astroman33

unread,

Jul 26, 2004, 6:33:03 PM7/26/04

to

Hi all, My Fender Champ amp has bitten the dust. After I turn it on, it starts
to hum and then the fuse blows. All the tubes are getting power I think. I
tried another rectifier,The Output tube is brand new. The speaker is good, I
can't find any bad resistors, or anything that looks burnt...well nothing
obvious.
This all happend when i was messing with the 1/4 inch jack on my Les Paul. It
was making all kind of noise when the amp just started humming.

Any ideas? TIA

Tweetldee

unread,

Jul 26, 2004, 7:15:43 PM7/26/04

to

Look for shorted or very leaky B+ filter capacitors.

--
Dave M
MasonDG44 at comcast dot net (Just subsitute the appropriate characters in
the address)

Never take a laxative and a sleeping pill at the same time!!
"Astroman33" <astro...@aol.com> wrote in message
news:20040726183303...@mb-m17.aol.com...

Astroman33

unread,

Jul 27, 2004, 4:02:49 PM7/27/04

to

How do I check if it is leaky?

CJT

unread,

Jul 27, 2004, 5:46:45 PM7/27/04

to

Astroman33 wrote:
> How do I check if it is leaky?

Is there goo oozing out of it?

--
The e-mail address in our reply-to line is reversed in an attempt to
minimize spam. Our true address is of the form che...@prodigy.net.

Astroman33

unread,

Jul 28, 2004, 5:22:01 AM7/28/04

to

No goo from the filter caps but there is some wierd green gooo on the top end
of the fuse, green in color. ???

CJT

unread,

Jul 28, 2004, 2:47:12 PM7/28/04

to

Astroman33 wrote:

> No goo from the filter caps but there is some wierd green gooo on the top end
> of the fuse, green in color. ???

Green usually means copper oxide -- corrosion. I don't know any way
that would cause hum, but it does suggest the amp has been in some
difficult environments.

But now I'm confused. I thought you said it blows fuses. Are you
saying a _new_ fuse gets covered with goo? I'd look for the source of
the goo. Corrosion takes time to develop.

Astroman33

unread,

Jul 28, 2004, 5:38:11 PM7/28/04

to

Yes it is blowing fuses after about 30 or 40 seconds. The Green goo was on the
original fuse when i took it out to look at it.

When i took the chasis out i then saw that same goo on the top of the fuse case
and around the wire?

CJT

unread,

Jul 28, 2004, 8:39:57 PM7/28/04

to

Astroman33 wrote:

> Yes it is blowing fuses after about 30 or 40 seconds. The Green goo was on the
> original fuse when i took it out to look at it.
>
> When i took the chasis out i then saw that same goo on the top of the fuse case
> and around the wire?
>

That's not the source of your hum, but you should probably clean it up
(e.g. with a damp paper towel) anyway.

>>>No goo from the filter caps but there is some wierd green gooo on the top
>>
>>end
>>
>>>of the fuse, green in color. ???
>>
>>Green usually means copper oxide -- corrosion. I don't know any way
>>that would cause hum, but it does suggest the amp has been in some
>>difficult environments.
>>
>>But now I'm confused. I thought you said it blows fuses. Are you
>>saying a _new_ fuse gets covered with goo? I'd look for the source of
>>the goo. Corrosion takes time to develop.
>>
>
>
>