UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post

Kat Manton · 21st Oct 2006, 2:28 pm

Hi again,

I've made a start.

The victi... research subject in question: One red Hacker RP30 Herald, serial 67656. Found to have an oscillator which didn't, cause... you guessed.

I decided to take the transistor apart, but it proved somewhat recalcitrant. I'd definitely got it hot enough to melt the solder, only the 'lid' seemed to be on tight. Eventually I gave up, thinking I'd probably destroyed it anyway.

Once it'd cooled off, just out of curiosity I checked it anyway. My meter claimed there was still a couple of diode junctions inside and there was no leakage from anything to the screen lead. So I tacked it temporarily on the back of the board and... one working Herald. I've since fitted it properly and I'm sat listening to it as I type this.

So, heating the case up melts the whiskers; not exactly unexpected. I'll make a note of what I've done and when and pop it inside the radio. Let's see how long this lasts...

Regards, Kat.

21st Oct 2006, 2:28 pm	#44
Kat Manton Retired Dormant Member Join Date: Jul 2005 Location: West Yorkshire, UK. Posts: 1,700	*Re: Are AF11's repairable?** Hi again, I've made a start. The victi... research subject in question: One red Hacker RP30 Herald, serial 67656. Found to have an oscillator which didn't, cause... you guessed. I decided to take the transistor apart, but it proved somewhat recalcitrant. I'd definitely got it hot enough to melt the solder, only the 'lid' seemed to be on tight. Eventually I gave up, thinking I'd probably destroyed it anyway. Once it'd cooled off, just out of curiosity I checked it anyway. My meter claimed there was still a couple of diode junctions inside and there was no leakage from anything to the screen lead. So I tacked it temporarily on the back of the board and... one working Herald. I've since fitted it properly and I'm sat listening to it as I type this. So, heating the case up melts the whiskers; not exactly unexpected. I'll make a note of what I've done and when and pop it inside the radio. Let's see how long this lasts... Regards, Kat.