Mark Zacharias wrote in message
...
"N_Cook" wrote in message
...
As far as I can tell this is the basic form to the power amp - what
class
is
it? and in general terms the operational bounds of the biasing, a lot of
diodes? seem to be involved.
Equi-spaced font needed for this ASCII, maybe properties/mesage details
or
copied into text handler with "Terminal ","Fixedsys" font or similar
(only 2 emitter resistors, on two central Tr and chokes in the other
emitter
commoned connections, all left out in the below )

---------------------- + rail
| |
|/ \|
-| |-
| |
| |
|--------| all 2SD2560
|
\|
|-
|
|
|---------- O/P
|
|
|-
/|
|
|--|----| all 2SA1647
| |
| |
-| |-
|\ /|
| |
--------------------- - rail







Looks like a lot of amps I see these days. Don't know for sure the "class"
but I suspect it's pretty conventional AB.

Those outputs are Darlington, by the way, so obviously there's an
additional
1.2 volts to be accounted for in the biasing...

Mark Z.


Assuming its rating at 200 watts into 4 Ohms is per (non stereo) channel ,
it does not seem right that all that current goes through 2 output TOP66
devices. I've not found any date so far, mixer section not looked at yet.
Does roundel stamp on the [cb with Japanese script on top and bottom
sections and 86 12 15 across the middle mean 1986?