Nice docs as always! Very thorough. I like all the options you built into this. HPF and continuous input pad are great. The SW PCB is really nice. Its going to be a fun build. A few questions...
1. To build as a pre with DI the DI input would go into J5 and J4 would be shorted? Or would it be plugged into J4 like the DI box? Or either? On the PCB it looks like J5 is going into the TX.
2. Can the "Drive" pot be connected to J4 even if I am building the pre just to get some dirty drive when required?
3. If I wanted to add the REDD EQ or any of your other EQs would it be before the 10k gain pot like the HPF setup?
4. I know this will mess with the impedance but is it possible to add an output attenuator after the output transformer in the style of the SR124 or in the style of the attached image?
This question is more about wanting to drive the hell of of this preamp if need be and get a little tube dirt for example on a DI bass. I know that this is a clean tube pre design and that you have taken measures to get a high gain, clean sound but options are always good. I guess if a "Drive" pot is possible than this question is moot anyways.
5. If I were to build this in a dual configuration is there a simple way to attach power, 48v and heater from 1 board to the other so as not to build 2 power supplies?
6. Again messing with impedance but if a meter is required it would go after the output TX?
I really like stepped gain pots so I would probably build a stepped 10k switch for the gain. Someething like
http://diy-tubes.com/gain-switch-kit.html or P2P
Thanks,
Alain