Re How to clean up tube shields

[Keith Harvey]

Often tube shields were made of "mu-metal", the same stuff used to make enclosures for VFO and similar circuitry. The mumetal prevented radiation in/ out of the devices it enclosed. The mumetal shields are probably gripped by similar metal spring fingers riveted to the tube base and chassis ground. Although a fussy job, you can clean these up with a Dremel tool and the cloth wheels, apply the same type of cleaner that is used on glass stove tops. This is a fine abrasive that doesn't scratch the hard glass used on cooktops, but cleans off baked on material. 

You might be succesful looking for mumetal shields at hamfests.

73

Keith Harvey
VA3KRV/W4

    

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