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3.6 volt computer batteries are readily available and will fit. They will work on a variety of voltages but 1.5 is not one of them. The frequency can be checked with a bare open probe to a scope or counter. Just hold it in front of the mic opening.
There are a number of production variables that make these a challange. Have worked on several of these lately. There are a number of pitfalls the these old cuties, be careful.
BTW a 9volt battery can make enough drive to arc-over at the element!
Last edited by 6GH8cowboy; 10-28-2013 at 12:58 PM.
Reason: 9 v warning
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