Have a receiver here and power supply is marked 25Hz. USA made for USA market. Who knows when and where in USA 25Hz was so common that 'consumer electronics' was manufactured to operate on it. -bob -- FAQ on WWW: http://www.contesting.com/FAQ/amps Submissions: amps@contesting.com Administrative requests: amps-REQUEST@contesting.com Problems: owner-amps@contesting.com