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Earthing/Screening
In Questions & Answers
Madmart54
Aug 26, 2024
Thanks for all the info
Getting ready to power up after renewing the electrolytic’s and having watched a load of YouTube videos to do it as safely as possible 🤞
In Show and Tell
Madmart54
May 28, 2024
This setup was all new to me but seemed to be recommended by various YouTube channels. As I was starting to get paranoid after changing all my electrolytics I thought I’d give it a go. Great fun making it but an extra cost for more or less a one off. The information I had was if the bulb glowed you had a short circuit. Being in the UK I got up to half voltage and the bulb glowed. Now I was worried. I went onto forums and now I was told that was normal and I might need a second 100W bulb-confused or what. I juggled the resistance figures in my head not knowing how much current my power amplifier needed. I tried again and the bulbs started to light before my voltage reference tube would strike-which I was used to seeing immediately on normal power up. Looking at the voltages I was getting nothing seemed untoward and I then checked the current. It seemed that the 200W of bulb seemed to cut in too early and choke the supply of current. Stephe kindly reassured me that she tends to use this method for initial testing. As I knew I’d wired everything correctly and there was no smoke smells or bangs I then went for a normal power up and rely on the fuse to blow. All went OK and sound emerged from the speakers-phew! After finally receiving my power plug it showed the amplifier takes about 1.4A at 240V so unfortunately it seems that when the bulbs illuminate they’re restricting the current to well under an amp max. Maybe if I’d have been brave enough and pumped the variac up to 240V I might have got a signal through the amp but I was too scared of the Big Bang theory! 🙂
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Dim light bulb glow
In Questions & Answers

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