Channel out

rhymeswthorange · 4th February 2006, 09:48 PM

My Paciific Stereo Concept 6.5's right channel is out. When I tap a thermal fuse (white radial box w/ paste) attachted to the power amp heatsinks, it sometimes comes back to a brief, quiet, crackly life. My question is, does this seems characteristic of a blown fuse? To have one channel work and the other not seems like something else... wouldn't it just not work at all if the fuse was blown? Also, it seems that the preamp section is the culprit - when i touch an input to the power amp, there is a strong hum on both channels. Any ideas? Thanks!

richie00boy · 4th February 2006, 10:12 PM

A white radial box could also be an 'emitter' resistor which is part of the output stage.

rhymeswthorange · 4th February 2006, 10:16 PM

This particular box was pasted onto both heatsinks and has the markings: "U12 125V 6A 83 95C UCHIYA"

Tube_Dude · 4th February 2006, 10:19 PM

Quote:

Originally posted by rhymeswthorange
When I tap a thermal fuse (white radial box w/ paste) attachted to the power amp heatsinks, it sometimes comes back to a brief, quiet, crackly life.

It seems to me , that white radial box is a thermal breaker, that stay always open, try to measure it with a multimeter in Ohms , it need to measure near 0 Ohms, at ambient temperature.

Regards.

rhymeswthorange · 6th February 2006, 08:37 PM

Well... the fuse isn't blown, any suggestions on how to proceed?

clem_o · 7th February 2006, 02:14 AM

Look on the underside of the board and start resoldering. You can try tapping components / board gently with a pencil, and try to find the spot most sensitive to the mechanical vibrations.

4th February 2006, 09:48 PM	#1
rhymeswthorange diyAudio Member Join Date: Apr 2005 Location: Grey Eagle, Minnesota	Channel out My Paciific Stereo Concept 6.5's right channel is out. When I tap a thermal fuse (white radial box w/ paste) attachted to the power amp heatsinks, it sometimes comes back to a brief, quiet, crackly life. My question is, does this seems characteristic of a blown fuse? To have one channel work and the other not seems like something else... wouldn't it just not work at all if the fuse was blown? Also, it seems that the preamp section is the culprit - when i touch an input to the power amp, there is a strong hum on both channels. Any ideas? Thanks!

4th February 2006, 10:12 PM	#2
richie00boy Did it Himself diyAudio Member Join Date: Nov 2003 Location: Gloucestershire, England, UK	A white radial box could also be an 'emitter' resistor which is part of the output stage. __________________ www.readresearch.co.uk my website for UK diy audio people - designs, PCBs, kits and more

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4th February 2006, 10:16 PM	#3
rhymeswthorange diyAudio Member Join Date: Apr 2005 Location: Grey Eagle, Minnesota	This particular box was pasted onto both heatsinks and has the markings: "U12 125V 6A 83 95C UCHIYA"

6th February 2006, 08:37 PM	#5
rhymeswthorange diyAudio Member Join Date: Apr 2005 Location: Grey Eagle, Minnesota	Well... the fuse isn't blown, any suggestions on how to proceed?

7th February 2006, 02:14 AM	#6
clem_o diyAudio Member Join Date: Jun 2005 Location: Manila	Look on the underside of the board and start resoldering. You can try tapping components / board gently with a pencil, and try to find the spot most sensitive to the mechanical vibrations.

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