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

howard · 29th Aug 2006, 9:11 am

Hello,

I have almost completed the restoration of a Murphy B801 which has 3 x AF117s. Two of the AF117s were dead and I have replaced them with 2 x AF116s, both of which were NOS but had the whiskers problem. These replacement transistors have had a capacitor discharged through them to clear the 'whiskers' (a somewhat simpler solution than dismantling them) and the set works well for around 10 mins but then it starts to distort

I don't know yet what is causing this problem but I will keep you posted. I hope that this little Murphy will eventually appear in Success Stories with the two 'repaired' AF11*s still in it.

Howard

29th Aug 2006, 9:11 am	#36
howard Nonode Join Date: May 2005 Location: Godalming, Surrey, UK. Posts: 2,593	*Re: Are AF11's repairable?** Hello, I have almost completed the restoration of a Murphy B801 which has 3 x AF117s. Two of the AF117s were dead and I have replaced them with 2 x AF116s, both of which were NOS but had the whiskers problem. These replacement transistors have had a capacitor discharged through them to clear the 'whiskers' (a somewhat simpler solution than dismantling them) and the set works well for around 10 mins but then it starts to distort I don't know yet what is causing this problem but I will keep you posted. I hope that this little Murphy will eventually appear in Success Stories with the two 'repaired' AF11*s still in it. Howard