tube synthsizer

[Paul Perry]

At 01:16 PM 25/10/99 -0700, Cal Grant  wrote:

>Other than using them to make tube pre-amps or similar effectors, they are
>not practical for synth use.  Synth circuits need to be exceptionally
>stable, and repeatable, and most need to have response down to DC.
>Most tube circuits must be AC-coupled to hold back the high voltage power
>supply biasing. 
>
You can get around the biassing by running a negative high tension rail as
well as the normal positive. You have a voltage divider from the anode down
to this, and 
pick off the output from the stage at the point that under no load is zero.
Look in any of the 1950& 1960 analog computer books (Like Korn's) for details.

paul perry Melbourne Australia