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SU-Z400 improvements?
SU-Z400 improvements?
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Old 7th September 2015, 05:20 PM   #1
wheijke is offline wheijke  Netherlands
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Join Date: Oct 2005
Default SU-Z400 improvements?

Found a dead cheap SU-Z400 'broken' which basically has a broken speaker connector which is easy to replace. It seems to work fine!
I read on another forum that someone replaced IC71 (AN7062) with a fresh one and upgraded Q71 and Q72 (2SA1123) to 2SA1124..

Are there any other things people recommend to do on this amp?

naks.com and vintagecassette.com my websites dedicated to Cassette Decks!
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Old 7th September 2015, 06:41 PM   #2
sreten is offline sreten  United Kingdom
Join Date: Nov 2003
Location: Brighton UK

Generally for cheap stuff, if it ain't bust don't try to fix it.
Replacing working IC's is pointless and changing working
transistors is asking for more trouble than it is ever worth.

rgds, sreten.
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Old 7th September 2015, 07:21 PM   #3
Ian Finch is offline Ian Finch  Australia
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Join Date: Apr 2010
Location: Coffs Harbour, NSW
Replace all the electrolytic capacitors and for as long as the rest of it hangs together, be happy
If only I had listened....
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Old 7th September 2015, 08:18 PM   #4
Welcome is offline Welcome  France
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Replacing 2SA1123 with the +1 is a waste of time and money. Only difference is higher SOA, something you do not need as the amp was designed around the 1123. Fully useless change. Not to mention if you get ahold of some 2SA1124, they will be fake. No longer made.
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