Dual Gate MosFets are convenient for a tube replacement....

As I recall, I rectified the old filament voltage, regulated it, and made
that the new "plate" voltage. Other than that, JFETs and, when necessary,
Dual Gate MosFETs did most of the work.

Well, had to mess with the "grid" bias resistors too.

OK, so I used an audio Amp IC for the last part of the audio chain.
Still, all in all, the conversions I did were surprisingly easy.


Jim


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22:34 Pacific Time Zone
Jan 15 2008

International Time
06:34 UTC
16.01.2008