G'day Guys,
I picked up a faulty Sony STR-DA80ES for $5.
This thing is built like a tank. I have never seen a big brand, mainstream brand amp built like this before.
I grab all the faulty amps I can to salvage what I can and this thing is just different.
It is assembled different to normal, much more complex, more brackets, more rigid, thicker steel etc.
The power transformer is "380w" but is twice the size one would expect. It weights 6kg. I salvaged a 360w pioneer recently with a power transformer that weighed a measly 4kg.
These caps are 50mm wide by 70mm tall.
These wacky 5 pin chips are what really baffle me.
I picked up a faulty Sony STR-DA80ES for $5.
This thing is built like a tank. I have never seen a big brand, mainstream brand amp built like this before.
I grab all the faulty amps I can to salvage what I can and this thing is just different.
It is assembled different to normal, much more complex, more brackets, more rigid, thicker steel etc.
The power transformer is "380w" but is twice the size one would expect. It weights 6kg. I salvaged a 360w pioneer recently with a power transformer that weighed a measly 4kg.
These caps are 50mm wide by 70mm tall.
These wacky 5 pin chips are what really baffle me.
I'm not sure whether to call this a chip or simply a BJT.
In this amp they are used in conjunction with a Sanyo STK350-230 voltage amplifier chip.
So now the questions, do these STK voltage amp chips sound any good?
Where is the driver transistor for the output?
I don't see a driver stage in the STK350 chip, the Sony output chips look to me like a pair of BJTs in parallel on one chip but on the schematic it is referred to as the driver.
In this amp they are used in conjunction with a Sanyo STK350-230 voltage amplifier chip.
So now the questions, do these STK voltage amp chips sound any good?
Where is the driver transistor for the output?
I don't see a driver stage in the STK350 chip, the Sony output chips look to me like a pair of BJTs in parallel on one chip but on the schematic it is referred to as the driver.
I owned this AV receiver many years ago and was very impressed with it, solid build and the best sounding receiver I owned to this point in time. It replaced a Kenwood, also rated at 100wpc, but the DA80ES sounded miles better.
After about 10 years it started get quirky, mostly digital end issues and the front door mechanism became an event to open/close, and eventually retired it for an Anthem/Rotel AV setup.
Hopefully you can fix it on the cheap and use it for a secondary stereo system.
After about 10 years it started get quirky, mostly digital end issues and the front door mechanism became an event to open/close, and eventually retired it for an Anthem/Rotel AV setup.
Hopefully you can fix it on the cheap and use it for a secondary stereo system.
This one has some weird digital issues so it's a salvage job.
I am tempted to try and turn it into a plain old 2 channel stereo reusing the weird parts.
I am tempted to try and turn it into a plain old 2 channel stereo reusing the weird parts.
So I recreated the schematic from the service manual.
Pretty sure I have done this right.
My question would be: since the amp has 5 pairs of outputs. Can I parallel the outputs like this?
Kind of over kill since these are double die parts, however the person who is likely to use this likes to listen loud so I see no reason not to use the extra parts.
Pretty sure I have done this right.
My question would be: since the amp has 5 pairs of outputs. Can I parallel the outputs like this?
Kind of over kill since these are double die parts, however the person who is likely to use this likes to listen loud so I see no reason not to use the extra parts.