Look into silver plated fuse holders from Acme Audio. See if they have the sizes you require.
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The type of spring clip, PCB mount fuse holders you need; seem to be nonexistent in silver or gold plate. It would be nice if the metals of which they are comprised, were better conductors. Unfortunately; metals that conduct well don't have the ability to retain the tension necessary, for a firm grab on the ends of a fuse. If I had the means, and there existed enough demand; I'd manufacture gold plated, solid copper fuse holders, with spring clips that snapped over each end, insuring a tight grasp/good contact. I could use four myself, for the +/- rails of my woofer system's amp.
I'm assuming the .5A fuse is for the screen supply of the tube amp in which case I might use a ceramic fuse vs. a glass fuse as glass fuses can shatter. Any properly rated fuse holder i.e. from Littlefuse etc. should work fine unless the amp uses the KTK type large fuse. I don't believe they do. It's been a long times since I worked on one. Whatever fuse holder you use just make sure it's free of corrosion.