I get a lot of my manuals from here.
http://service-manuals.webs.io/
You may get lucky with a free one here.
http://www.eserviceinfo.com/
http://service-manuals.webs.io/
You may get lucky with a free one here.
http://www.eserviceinfo.com/
A lot of marketing "snake-oil" and "fluff".
Most , if not all - of the DIY amp projects on this forum would far
exceed that sony in both speed and SQ.
(below) , the sony does appear to be using some type of class "AB2"
output stage.
And a bit faster 2sc2681 output at 80mhz Ft .
But , that's it - no "magic" here !
OS
Most , if not all - of the DIY amp projects on this forum would far
exceed that sony in both speed and SQ.
(below) , the sony does appear to be using some type of class "AB2"
output stage.
And a bit faster 2sc2681 output at 80mhz Ft .
But , that's it - no "magic" here !
OS
Attachments
It would be nice to correct the title of the thread from 'lrgato' to 'legato'.
Nothing special - however if you want to see the prototype of sorts for this amp, it's the sony TA=F555ES (NOT the Mk2 version). THis is the first Sony ES series integrated. THe surprising thing you might find there are Sanken LAPT transistors in the oiutput without ANY emitter resistors whatsoever. The trick is that it uses the internal array resistors. This reduces the Re to an absolute minimum and increases the size of the class A operation area. i.e. extends the crossover region to it's maximum. The trick of course is thermal stabilization but this amp handles it very well by also having thermal feedback from the drivers. The sown side is that only a single pair of transistors can be used. It is also possible to further refine the concept by using a single external emitter resistor to balance the effective value of the internal Re of the PNP and NPN part, unfortunately the value of such resistor might be impractically low.
Nothing special - however if you want to see the prototype of sorts for this amp, it's the sony TA=F555ES (NOT the Mk2 version). THis is the first Sony ES series integrated. THe surprising thing you might find there are Sanken LAPT transistors in the oiutput without ANY emitter resistors whatsoever. The trick is that it uses the internal array resistors. This reduces the Re to an absolute minimum and increases the size of the class A operation area. i.e. extends the crossover region to it's maximum. The trick of course is thermal stabilization but this amp handles it very well by also having thermal feedback from the drivers. The sown side is that only a single pair of transistors can be used. It is also possible to further refine the concept by using a single external emitter resistor to balance the effective value of the internal Re of the PNP and NPN part, unfortunately the value of such resistor might be impractically low.
I had one 30 years ago. It also had a switch-mode psu module inside, allowing for a very low height.
I liked mine but it developed a VERY intermittent fault on one channel: Loop went open causing a very loud "crack!" on the speaker. I tried for months to locate it but never succeeded
It would never go wrong with the lid off and I used up a wholesale supply of freezer spray! Changed loads of components. Probably a PTH, but life is too short!
Anyway, not a fault specific to Sony, and otherwise I liked the amp.
I liked mine but it developed a VERY intermittent fault on one channel: Loop went open causing a very loud "crack!" on the speaker. I tried for months to locate it but never succeeded
It would never go wrong with the lid off and I used up a wholesale supply of freezer spray! Changed loads of components. Probably a PTH, but life is too short!Anyway, not a fault specific to Sony, and otherwise I liked the amp.
That would be TA-F55 not F555. The latter has a regular transformer (with dual secundary and 4/8 ohm load selection)
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