Threshold 400a power switch

j beede · 30th December 2007, 10:34 PM

After many years of relaibale service the power switch/breaker seems to have failed on my 400a. I powered it on and the breaker immediately flicked off. Now the switch is loose and exhibits no mechanical resistance to moving into the on or off position. I can see no "reset" for the switch. Is this the normal failure mode? Does anyone know of a replacement switch for this old amplifier?
...j

Nelson Pass · 31st December 2007, 06:08 PM

Most of the 400A's had a breaker made by Heinemann. I
suggest you try their website for dimensions and such,
and note that there are alternate manufacturers for their
products.

KBK · 31st December 2007, 06:14 PM

What can one say about a company called 'AssMan?

j beede · 31st December 2007, 10:58 PM

Quote:

Originally posted by Nelson Pass
Most of the 400A's had a breaker made by Heinemann. I
suggest you try their website for dimensions and such,
and note that there are alternate manufacturers for their
products.

Thanks for the quick reply NP,
Yes, I pulled the switch and it is indeed a Heinemann JC1-A8-BB-A. That part number does not produce may hits via Google :| I am still searching for a datasheet for this particular switch. This makes me think that they are not ordinarily failure prone. Any DIY'ers already found a form/fit/function replacement from prior repairs?

The good news is that in spite of the switch's failure the amplifier is intact... I replaced the switch with a 10 amp fuse and it is making good music as I type this.
...j

30th December 2007, 10:34 PM	#1
j beede diyAudio Member Join Date: Dec 2007	Threshold 400a power switch After many years of relaibale service the power switch/breaker seems to have failed on my 400a. I powered it on and the breaker immediately flicked off. Now the switch is loose and exhibits no mechanical resistance to moving into the on or off position. I can see no "reset" for the switch. Is this the normal failure mode? Does anyone know of a replacement switch for this old amplifier? ...j

31st December 2007, 06:14 PM	#3
KBK diyAudio Member Join Date: Dec 2003 Location: The Wilds Of Canada	What can one say about a company called 'AssMan? __________________ "Never forget that only dead fish swim with the stream." -- Malcolm Muggeridge. "Truth cannot be brought down, rather the individual must make the effort to ascend to it." -- Jiddu Krishnamurti

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31st December 2007, 06:08 PM	#2
Nelson Pass The one and only Join Date: Mar 2001	Most of the 400A's had a breaker made by Heinemann. I suggest you try their website for dimensions and such, and note that there are alternate manufacturers for their products.

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