sony ta-f444es tweeks

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#61
Mooly said:
-13 volts is no good. Certainly a problem on that channel.

Is the other reading -0.21 volts ? If so that could be OK. Although it should be as near zero as possible it may not be due to a fault.

It's up to you what you want to do of course...

It really involves powering the amp via a bulb limiter (100 watt bulb in series with the mains) to limit current and making a several detailed voltage measurements and resistance checks. The bulb can prevent damage in the event of the output transitors drawing too much current.

Power amp faults tend to be short circuit output transistors, probably failed driver transistors (collateral damage) and failed low value resistors like those 0.1 ohms.
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yes other channel -0.21v,i'll have to a think,im not sure if im the man for the job mooly,what ever i do,i appreciate all the time you've spent helping me.🙂
 
#63
i've decided to continue with the build,a bit of a winter project,i ve put these pics up of the EQ board,it to has an op amp,should i replace this also,i have to order some parts,any thing else on this board that needs upgrading.
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P021111_16.16.jpg (721.2 KB)
 

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#68
It's not suitable to make bridgeable in standard form.

Heatsinking, PSU, component ratings to name a few. Plus the huge amount of reworking involved, adding additional circuitry and after all that you end up with a mono amp so you would need two identical units.

It's a non starter really.
 
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