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Old 16th February 2007, 02:19 PM   #1
legarem is offline legarem  Canada
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Default Exposure model 8 output transistors

I have an Exposure 8 amplifier with blown output transistors on left chanel.

The output transistors are TO3. The company buffed the numbers on them. I suspect that they are bipolars transistors.

Do someone knows what number they are ?

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Old 16th February 2007, 04:13 PM   #2
lineup is offline lineup  Sweden
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here is a similar topic
at another website

I do not know if they have solved this ...
The complementary transistors are marker SM8540 and SM8554 for the N and P type respectively.
Does anyone know what the modern equivalents of these transistors?
Exposure VIII power amp report
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Old 16th February 2007, 09:23 PM   #3
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I have an Exposure XV that im trying to repair. According to Exposure some parts in thier older amps like your 8 and my XV were custom made for them. This is true for the output transistors and larger power supply caps. The parts are rather expensive from Exposure around $15 each for he transistors. Mr Brady from Exposure told me that I could use an Mj15003/4 transistor as a replacement, it will work but he said he would not garuntee the sound quality would be as good as the Exposure part. II got the same answered when i wanted to recapp my amp a year or two ago, they said the capacitors were custom made and cost $35each!! Luckily I found out from a good source that thier custom caps were really BHC Aerovox with an Exposure label and i saved myself about $80.
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Old 16th February 2007, 10:18 PM   #4
legarem is offline legarem  Canada
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Thanks for these informations

Where can we find BHC caps in North America ? I thought replacing the ones in my amp with Panasonic TSHA Caps
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Old 17th February 2007, 09:18 PM   #5
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I got mine direct from BHC as samples. You would have to contact them about local dealers. Most likely any good quality cap will give good results but I went with BHC because thats what the origionals were and I wanted to stay as close to the orgional sound as possible.
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