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Old July 10th 08, 05:52 AM posted to alt.collecting.8-track-tapes
carfreak
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Posts: 7
Default Toshiba sa-500 receiver

On Jul 9, 5:14*pm, DeserTBoB wrote:
On Wed, 9 Jul 2008 14:20:57 -0700 (PDT), Rusty

wrote:
we did switch the speaker leads. that was the first thing we did. the
speaker was not the issue. the receiver has a lot of sentimental value
to my friend it belonged to his grandparents. how hard is it to switch
out the output transistor? snip


OK, this unit (I believe) has a speaker selection switch. *Try running
from the "B" speaker terminals and see if the problem still stays the
same.

Replacing a standard TO3-case output transistor is quick work, but
first you have to know how to find the bad one. *Tools would be a
soldering iron, thermal grease and normal screwdrivers, side cutters,
et al. *I really don't have the JEDEC number of the original outputs
on those handy, but suffice it to say that, if failed, the bad
transistor won't be shorted, since the amplifier is still operating.
I'd look for oxidized connections on the output transistor heat sink.
Also, be aware that Japanese electronics from this era were well known
for developing cracked solder on their wave-soldiered PC boards, but I
don't think that's the issue here.


My receiver hasn't been used in probably over a decade, so oxidation
is very possible. I will check it out, thanks for the advice. If I
do find oxidation, how should I clean it?
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