Re: Fender M-80 Combo 1x12 Not Working

In article <u8s1g1ts4eqadi35qh7f9fs2ib4cn1dbtg@xxxxxxx>,
PMG <xxxxxxxXX@xxxxxxxxxxx> wrote:

> On 15 Aug 2005 09:17:23 -0700, jjbutera@xxxxxxxxxxx wrote:
>
> >No, the fuse didn't blow again. I did notice that two cement power
> >resistors (330 ohm, 5W, 10% tolerance) have a crack in the middle of
> >them. These are in the power circuit. I have not yet tested them for
> >the proper resistance to see if they are still functioning despite the
> >crack. They could be the culprit.
>
> The chances of something with a crack in the middle of it (other than
> the obvious) actually working properly... probably isn't very good.
>
> Pete
>
> --
Actually fractures in the filler of these ceramic resistors is par for
the course. I see it all the time. Now, if the shell had a crack, that
would be different. They do heat up quite a bit in normal use.

If they test OK, I'd still check their solder connections. These
resistors are most likely dropping resistors for the +/- 15V supply (op
amp rails). If one went, it would probably affect the front end and not
the power amp (unless the PA input differential is an opamp).

My M-80 prints are back in the shop, unfortunately. The preceding is
just my best guess for now.

--Mike

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