Help THRESHOLD 400A AMP, Nelson?

vsr123 · 10th June 2004, 06:37 PM

Hi
Does anyone know what the rating of this amp is per channel? How much heat is dissipated by this amp? Is it comparable to an Aleph 3? What are the power rails and capacitance for its PSU?

thanks so much
vsr

Cobra2 · 10th June 2004, 06:40 PM

http://www.threshold-audio.com/discontinued.html

Arne K

roddyama · 10th June 2004, 07:20 PM

If I'm not mistaken, this amp, like the 800A, gained efficiency by using a dynamic bias circuit.

Nelson Pass · 10th June 2004, 09:06 PM

That is correct. It was rated at 100 watts/ch and idled at
about 125.

vsr123 · 10th June 2004, 09:24 PM

thanks for those prompt replies. I was looking at using an old amp I saw in a surplus store as the chassis+heatsink for an aleph 3, I guess the heatsink should be sufficient.
Does anyone know about the PSU rails (I dont know if they are working or not as yet)? Can I just use this for the Aleph 3?

thanks
vsr

Nelson Pass · 10th June 2004, 09:31 PM

The rails are about 45 volts. This would be more appropriate
to an Aleph 2 than a 3, whose rails are +/-25

10th June 2004, 06:37 PM	#1
vsr123 diyAudio Member Join Date: Mar 2003 Location: california	Help THRESHOLD 400A AMP, Nelson? Hi Does anyone know what the rating of this amp is per channel? How much heat is dissipated by this amp? Is it comparable to an Aleph 3? What are the power rails and capacitance for its PSU? thanks so much vsr

10th June 2004, 06:40 PM	#2
Cobra2 DIY ! diyAudio Member Join Date: Apr 2002 Location: Stavanger, Norway	http://www.threshold-audio.com/discontinued.html Arne K __________________ Ars longa, vita brevis

10th June 2004, 07:20 PM	#3
roddyama diyAudio Moderator Emeritus Join Date: Jan 2002 Location: Michigan	If I'm not mistaken, this amp, like the 800A, gained efficiency by using a dynamic bias circuit. __________________ Rodd Yamashita

10th June 2004, 09:24 PM	#5
vsr123 diyAudio Member Join Date: Mar 2003 Location: california	thanks everyone thanks for those prompt replies. I was looking at using an old amp I saw in a surplus store as the chassis+heatsink for an aleph 3, I guess the heatsink should be sufficient. Does anyone know about the PSU rails (I dont know if they are working or not as yet)? Can I just use this for the Aleph 3? thanks vsr

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10th June 2004, 09:06 PM	#4
Nelson Pass The one and only Join Date: Mar 2001	That is correct. It was rated at 100 watts/ch and idled at about 125.

10th June 2004, 09:31 PM	#6
Nelson Pass The one and only Join Date: Mar 2001	The rails are about 45 volts. This would be more appropriate to an Aleph 2 than a 3, whose rails are +/-25

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