Exposure model 8 output transistors

legarem · 16th February 2007, 02:19 PM

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 ?

Thanks

lineup · 16th February 2007, 04:13 PM

here is a similar topic
at another website

I do not know if they have solved this ...

Quote:

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

imperfectcircle · 16th February 2007, 09:23 PM

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.

legarem · 16th February 2007, 10:18 PM

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

imperfectcircle · 17th February 2007, 09:18 PM

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.

16th February 2007, 02:19 PM	#1
legarem diyAudio Member Join Date: Jan 2005 Location: Quebec city	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 ? Thanks

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16th February 2007, 09:23 PM	#3
imperfectcircle diyAudio Member Join Date: Jan 2005 Location: nyc	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.

16th February 2007, 10:18 PM	#4
legarem diyAudio Member Join Date: Jan 2005 Location: Quebec city	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

17th February 2007, 09:18 PM	#5
imperfectcircle diyAudio Member Join Date: Jan 2005 Location: nyc	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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