Threshold 400A HELP !!

Airedale · 9th February 2005, 11:52 PM

Can anyone tell me the factory reccomended fuse size on the power board for this amp ?

I know this is a loaded (and somewhat unfair question), but what generally would cause the power board fuse to blow in one channel at about 50 watts continuous power on these amps ? Is there any smoking gun or "have you looked at this first" type of thing ? Thanks!

Nelson Pass · 10th February 2005, 08:30 PM

My schematic does not show a power board fuse - it shows
an output fuse and a AC line fuse. If there is a fuse in line
with the DC supply, it would be on the negative rail, and I
would start with a 3 amp fast blow to see if it pops on turn-on,
which would indicate a failure.

johnsciolino · 16th February 2005, 10:56 PM

I can tell you all about that amp.
You have a bown output transistor

9th February 2005, 11:52 PM	#1
Airedale diyAudio Member Join Date: Jan 2005 Location: Above ground	Threshold 400A HELP !! Can anyone tell me the factory reccomended fuse size on the power board for this amp ? I know this is a loaded (and somewhat unfair question), but what generally would cause the power board fuse to blow in one channel at about 50 watts continuous power on these amps ? Is there any smoking gun or "have you looked at this first" type of thing ? Thanks!

16th February 2005, 10:56 PM	#3
johnsciolino diyAudio Member Join Date: Aug 2004 Location: florida	400A I can tell you all about that amp. You have a bown output transistor

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10th February 2005, 08:30 PM	#2
Nelson Pass The one and only Join Date: Mar 2001	My schematic does not show a power board fuse - it shows an output fuse and a AC line fuse. If there is a fuse in line with the DC supply, it would be on the negative rail, and I would start with a 3 amp fast blow to see if it pops on turn-on, which would indicate a failure.

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