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The white stuff inside the fuse is probably flux residue. No need to replace it.
The electrolytic is a judgement call. No sign of leakage that I can see. A new one wouldn't hurt, but it isn't likely to fail catastrophically during initial testing like a filter cap in really old tube gear.
The diodes probably run hot enough to bake the board a bit. If you replace them, leave the leads a bit longer and space the diodes off from the board by 1/4" or so so air can get under them. Replacements are cheap enough, but be careful desoldering them. The heat damage to the board will make the traces more fragile than normal.
Your homemade cable should be fine. The max frequency on this thing is only 100 MHz, no?
Last edited by N2IXK; 04-24-2014 at 07:48 AM.
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