Only 1 changed resistor inside in 40 years, pretty good for twice weekly use over most of that time. Heaters glow but HT and bias supply stays up and no extra current draw coming out of standby. The 2.2K 7W W/W dropper for the minor HTs gone o/c. First set went fine, switched to standby for break and then nothing there for the second set. Is that resistor most stressed in standby? No obvious overheating of the R or the whale hide or whatever "circuit board" material. Assuming no other problem , it just failed from old age/corrossion but replace with same rating or go up to 11W? No rubber insulation found , any health and safety considerations other than the usual modern considerations? 2 issues with the Bulgin plug+socket mounted on the cab but thats just a UK thing. I'll do the usual remove the red voltage selctor knob on the rear and secure inside and blank off the shaft of the switch, as too easy to drunkenly turn that knob to "repair" a fault situation in UK 240V land.
- posted
8 years ago