UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post - Marshall JTM45 Guitar Amplifier- Mains (Primary)Fuse Blows

ITAM805 · 11th Aug 2018, 10:54 am

Further to what omegaman has suggested, a shorted rectifier would be the prime suspect. If not then if the HT fuse is intact then it sounds like it is the mains tx to me? I have had to replace one with an identical fault on a 100 watter, turned out to be a shorted HT winding. Check the resistance of the those winding from the centre tap

11th Aug 2018, 10:54 am	#6
ITAM805 Nonode Join Date: Jul 2010 Location: Folkestone, Kent, UK. Posts: 2,172	Re: Marshall JTM45 Guitar Amplifier- Mains (Primary)Fuse Blows Further to what omegaman has suggested, a shorted rectifier would be the prime suspect. If not then if the HT fuse is intact then it sounds like it is the mains tx to me? I have had to replace one with an identical fault on a 100 watter, turned out to be a shorted HT winding. Check the resistance of the those winding from the centre tap Last edited by ITAM805; 11th Aug 2018 at 10:59 am.