If your vintage tube gear's grid/anode wires looks like the one in the last photo, They needs to be replaced. Dried out and cracked wires will cause arcing, inaccurate readings and even shock hazards. Old cap contacts are often corroded or no longer fit tubes snugly.  These are used in tube testers, HAM transmitters and a few vintage audio amplifiers. 

This fully assembled 14mm, 18" 30KV replacement lead is for the Large tube caps used on 811, 572B, 866A and similar tubes. I also sell small and large cap versions along with kits containing all three cap sizes in my store's "Test Equipment Vintage" Department. Free shipping on these items. Tube and tester shown in photos are not included in the offering.

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