On 31/07/2017 20:45, Gareth Magennis wrote:

I'm trying to repair an Onkyo surround sound amplifier with a blown STK
422-730.
I wouldn't normally take this on, but it is for a friend who is not very
well, or very wealthy.

Well first off, I can't even find a datasheet for this particular STK,
let alone find an STK 422-730 I could buy.

(STK's from china don't count as they will be fake and I need to get
this working ASAP)
The original is a Sanyo package like this, but this is not a Sanyo part:
http://www.ebay.co.uk/itm/1PC-STK442...AOSwXXxZW3r W



So I have been looking at substitutes.
There are a whole range of 2 channel STK's with 14 pins, of various
amplifier powers.
Are all these compatible? If I get something close will it just plug in
and play?


There's a whole load of other much cheaper older package STK442-XXX
modules available, eg:
http://www.ebay.co.uk/itm/Hybrid-IC-...AOSw53NY~io e


Not being able to find the datasheet means I don't even know the power,
but that is not as important as getting this amp into some semblance of
making sounds again.

Might it be worth taking a punt on one of these cheap older packages not
from China?



Cheers,


Gareth.


I long ago stopped trying to find exact replacements, settling on 1, or
2 for stereo, easy to find TDA7293. A bit of time working out the pinout
of the original . The only hiccup has been , sometimes the mute line
needs a simple inverter transistor in line with it/them. None bounced
back , is all I cansay on reliability