The batteries are for talk voltage. 3 volts is all that is required but the actual voltage is not critical. Use whatever will fit. For testing I used 2 AA batteries in a holder. It worked fine. C, D, or X cells would last longer. I would hazard a guess that a 9 volt battary would work fine. dont forget That normal telephones have had a working voltage of 48-54 VDC from the Telephone company for ever.
I use mine as an intercom from the garage to an antique crank telephone in the kitchen. It works fine. It also amazes people when the old Hercules oak wall phone rings!
Oh yeah I work for a telephone company so when I say I tested it I mean I really tested it! And it passed!
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Ralph Volkert
UC 2Mk I*
Upper Hull: CB 8075
Lower Hull: 8105
S/N: 9075
Date: Jun(est) 42
contract #: CDLV 213
1946 Willys Jeep
1974 Plymouth Road Runner
1987 Trans Am
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