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 Post subject: HT fuse for Thor kit
PostPosted: Tue Nov 09, 2021 10:26 pm 
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Joined: Tue Oct 20, 2020 8:41 pm
Posts: 8
I just realized my kit only came with a mains fuse. I'm not exactly sure why. What value should I use if I add an HT fuse?


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 Post subject: Re: HT fuse for Thor kit
PostPosted: Mon Nov 15, 2021 6:14 pm 
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Joined: Sat Sep 25, 2010 3:04 pm
Posts: 143
Interestingly, most of the 18 watt schematics I've seen do not use a HT fuse. However, I suppose you could use a 0.5A FB between the power supply center tap and ground, similar to the JTM.

Read this from the old 18 watt forum:
https://www.18watt.com/viewtopic.php?p=192209&sid=980af41036e6008bd5744b3a94d096c1#p192209

Here's some good stuff from Merlin (Valve Wizard) on fuses. He opts for 2 fuses on the HT winding prior to the rectifier rather than fusing the center tap:
http://www.valvewizard.co.uk/fuses.html

You could also place safety diodes on the rectifier socket (in series) if you are worried about a short causing PT damage:
https://www.tdpri.com/threads/rectifier ... e3.833572/


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