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Silicon · 11th Sep 2019, 9:32 pm

There seems to be a 0.05uF capacitor (C60) from the live wire to the chassis.

If this capacitor fails short circuit, the full 240V mains will appear across the 30 Ohm resistor and the two 3.5V 0.15A bulbs which are in parallel with the resistor. A large current will flow!

That capacitor should be replaced by an X class capacitor rated for 250V AC mains even if it is not faulty.

What size fuse do you have in the mains plug? I use 1 Amp fuses.

11th Sep 2019, 9:32 pm	#9
Silicon Nonode Join Date: Jun 2007 Location: Coulsdon, London, UK. Posts: 2,167	Re: Horace needs help. Bush VHF70. There seems to be a 0.05uF capacitor (C60) from the live wire to the chassis. If this capacitor fails short circuit, the full 240V mains will appear across the 30 Ohm resistor and the two 3.5V 0.15A bulbs which are in parallel with the resistor. A large current will flow! That capacitor should be replaced by an X class capacitor rated for 250V AC mains even if it is not faulty. What size fuse do you have in the mains plug? I use 1 Amp fuses.