Thread: Husun 55
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Old 16th May 2021, 4:31 pm   #1
crackle
Rest in Peace
 
Join Date: Mar 2011
Location: Basildon, Essex, UK.
Posts: 4,100
Default Husun 55

I couldn't resist buying this today for a miserly £8.
The radio was dead on arrival, which turned out to be the on/off switch not making contact.
It now seems to be working OK into a dummy load.
But one think I would like advice on is the 78005AP regulator. It is permanently live when set is switched off but with a 12v supply connected to radio. the output is about 6.3v. I suspect it is something to do with the circuit that enables the retention of the last channel selected. If the supply is disconnected the radio reverts back to ch16 when it is powered on again.
I burnt my finger on it, it was really hot, not quite so hot as to make a sizzling noise but enough to make me pull away rapidly.
It is not clamped to any heat sink, it just appears to have been stuck to the side chassis with a sticky pad which has lost its stick on one side.
When the radio is switched off it cools down, it only gets very hot when the radio is switched on.
Does anyone have a circuit for this radio, I would like to see what the most likely cause for the excessive heat being generated is.
thanks
Mike
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