If you want a AC powered unit, check out this from Radio Shack.

If you know a HAM, ask him if he's got a spare since they are used to run mobile radios while in the shack.

I think Fry's has them as does Parts Express.

Michael

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Usta haves '69 250/8, '76 280C, 1971 250C 114.023, 1976 450SEL 116.033
Current have, 1983 300SD 126.120