JM, thanks for your reply.
Here is the link to the professor tweed schematic. http://www.runoffgroove.com/professor.html
The schem has it running off of +9v, but for use as a pre most folks (I checked at DIY audio forum) use +12v for more headroom (with no ill effects).
I am glad to hear that it won't be an issue to just derive the lower voltage from the +24v rail in terms of current draw.
Some questions, however:
Why does one need to use a Zener diode? to keep current from flowing "backward"? or is it for voltage drop? Is it a big no no to just use a resistive divider to get the required lower voltage?
Here is the link to the professor tweed schematic. http://www.runoffgroove.com/professor.html
The schem has it running off of +9v, but for use as a pre most folks (I checked at DIY audio forum) use +12v for more headroom (with no ill effects).
I am glad to hear that it won't be an issue to just derive the lower voltage from the +24v rail in terms of current draw.
Some questions, however:
Why does one need to use a Zener diode? to keep current from flowing "backward"? or is it for voltage drop? Is it a big no no to just use a resistive divider to get the required lower voltage?