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Do It Yourself (DIY) paradise for tube and SET project builders.

RE: Installing a protection fuse.

G'day as per attached link the reason why fusing the Kathode is not such a great idea.
Verbatim from link
It took me quite a while before I could reconstruct the chain of events which led to this result. Mr. Jadis decided to protect the power valves with a fuse in series with the combined cathodes of each output channel. This seems sensible but it now appears it is not. Think of what happens if a valve looses its vacuum. The valve will develop full conductivity. Now the fuse blows. The cathode will be lifted to a voltage near the +500 Volt of the HV supply present at the anode.


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  • RE: Installing a protection fuse. - Johno 21:52:37 06/18/17 (0)

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