On Wed, 18 May 2005, Dave Lag wrote:

> Some early tube recorders (e.g., 1954 AC-operated Ampro) and transistor
> ones (mid-60's $30 Lafayette portable) had this arrangement.

Most microcassette recorders still do that. Even big brand names. People 
who use the bias oscillator apparently need to pay royalties to someone 
(after all these years ?) so they avoid it if they can.

Peter
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