Marshall JTM 60, 12 years old has suddenly started blowing the HT fuse sporadically, 500mm slo blo.
I replaced the EL34s with 2 Harmas from Watford, it still does it.
The HT voltage is 493 VDC with nothing being played.
I suspect the HT smoothers which are rated at 550VDC but the only ones I can get are 500VDC which I don't think is enough headroom on the working voltage.
Any ideas ?
I've asked Amanda, she's probably still in bed.
Cheers
Ecca