Question about Sansui Audio & Video Receivers
This great old amp uses an Alps brand attenuator. This could be a little hard to find an exact fit replacemernt. Have you tried to clean the control. The can generally be restored by flooding the internals with CRC 2-26. If you have intermittent channels, check also the amp/preamp switch to the rear of the amp also.
Check out this Has some instruction on dealing with the disassembly of the attenuator
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Posted on Jun 05, 2008
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Apr 07, 2011 | Sansui Audio & Video Receivers
Generally speaking, an amp protects itself from heat, shorts and overloads.
Overloads can be from excessive periods of high output and shorts would be wiring issues or a speaker blowing up.
You should be able to feel if it's hot. WHY is it overheating? Make sure it has sufficient ventilation on all sides and that vent holes are not blocked by dust balls. Ensure the fan (if equipped) is running as designed (some only operate on demand). Clean dust and debris from it.
If the amp comes back on after cooling, you're lucky. They only have so many self-protection cycles in their lives so continuously resetting or cycling their power without addressing the cause can do more harm than good.
If it protects immediately on a cool power up you should disconnect the speaker connections and try it 'naked'. If it comes up then diagnose which lead(s) are shorted. If it does not come up the problem is internal and should be left to an experienced hands-on tech.
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