Transistor for Orion car amplifier

[Dan]

I need to find some replacement transistors for my Orion Cobalt CO430
car amplifier.

The amp has a row of six heatsinked transistors along each side of the
circuit board. The part I need is labelled:

ORION
0490-0210
T9418AJ

The OTHER transistors along the same row (but which look visually OK
in my amp) are labelled:

SMW20P10
T9418AB
TAIWAN

There is also a triangle symbol that precedes the T9418__ part numbers
on each part.

The new parent company of Orion wasn't able to help. They told me
they didn't keep any parts lists from products made by the old
company. I tried Digi-Key and a couple other parts suppliers, but
they didn't have a cross-reference.

Can anyone provide a replacement part number? My car got flooded and
these parts burned up in the amp under my seat. I'd rather replace
the parts than buy a whole new amp, since it looks like an easy job to
replace them (along with a 10-ohm resistor that also fried).

Thanks to anyone who can help.

 

[Romano]

danstark2003@hotmail.com (Dan) wrote in message news:<6f3d6a80.0310281136.39b2dd2c@posting.google.com>...

I need to find some replacement transistors for my Orion Cobalt CO430
car amplifier.

The amp has a row of six heatsinked transistors along each side of the
circuit board. The part I need is labelled:

ORION
0490-0210
T9418AJ

The OTHER transistors along the same row (but which look visually OK
in my amp) are labelled:

SMW20P10
T9418AB
TAIWAN

There is also a triangle symbol that precedes the T9418__ part numbers
on each part.

The new parent company of Orion wasn't able to help. They told me
they didn't keep any parts lists from products made by the old
company. I tried Digi-Key and a couple other parts suppliers, but
they didn't have a cross-reference.

Can anyone provide a replacement part number? My car got flooded and
these parts burned up in the amp under my seat. I'd rather replace
the parts than buy a whole new amp, since it looks like an easy job to
replace them (along with a 10-ohm resistor that also fried).

Thanks to anyone who can help.

I can suggest a (not too) technical replacement solution:

First of all, you should guess or measure if they are MOSFET or BJT
transistors. To do this: 1. read on the box/user manual, sometimes
they say MOSFET POWER AMPLIFIER 2. try with a plain multimeter in
diode position, to measure something on the other row (may be
functioning) of transistors. It's quite easy to discover if they are
BJT or MOSFET. If they are BJT you should read some 0.6V between B and
C, and B and E. Try reversing polarities of multimeter while
measuring. For affordable results, desolder a good transistor and
measure it. If it is not possible to get any 0.6V aforementioned, you
can say that you have MOSFET (or a broken BJT! sorry) (oh, well, there
may be BJT of darlington type that can measure 1,3V).
3a. hardest part: you can use an old curve tracer to get some
technical information on BJT/MOSFET, then choose an equivalent type.
3b.Alternatively you should look at the PCB, in order to discover the
pinout. Usually you will find a "narrow" PCB trace connecting to B
(BJT) or G (MOSFETS), then heavy traces for E C (BJT) or D S (MOSFET).

An **important** thing I miss: do you know if the devices are for the
switching regulator or for the audio power amplifier? Both of them
should be heatsinked, but normally they are DIFFERENT. Actually you
should have some PAIRS of complementar devices for the audio amp, and
some DIFFERENT pairs (or single devices) for the switching regulator.
You can easily discriminate looking at the ones connected to a ferrite
transformer (switching reg).