Mcinku, that's interesting. I hear those Carol Ann amps really sing.
It's somewhat over-complicating it though I think - the thought was more about a small mod to take advantage of something that's already there, rather than building a whole new preamp channel.
My point exactly! - just use a relay set up like this:
- Pole1 switches the INPUT of the OD between HRM and standard/Non-HRM input
- Pole2 switches the output of the OD to go through the HRM tone stack or bypass
Quite simple and no additional tubes.