After some really frustrating eBay searches for 1/4" phono jacks (you know, instrument jacks) I feel the need to chime in with a simple fact for people:
JACKS and PLUGS are different!
Unlike humans, there are hard definitions when it comes to connector mating pairs and gender.
FEMALE JACKS do not exist - those are called... JACKS.
MALE JACKS also do not exist - those are called... PLUGS.
You PLUG a cord into a JACK.
Good grief!
So I managed to fix the issue I alluded to in my previous post - that issue being an excessive amount of extremely high--frequency noise (nails on chalkboard type) introduced with the controls at certain points. I managed to eliminate the noise by adding a 4.7nF capacitor from pin 7 of the 6LE8 to ground. I also made some miscellaneous changes, the biggest of which is the addition of a four-position rotary switch that will change the frequency at which regeneration occurs.
While I was trying to diagnose the noise issue, I used my capacitor substitution box and I was trying to see how changing the value of C15 in the original schematic affected things. I really liked being able to change the range of the feedback oscillations, so I decided to add the switch. It is entirely optional; you can just pick a cap value and use that, as per the original design.
Here is the updated diagram - as always, click on the image to make it larger, then right-click on the engorged image and click 'Open image in new tab' to see the full size.
Still working on audio/video demos, and trying to figure out how the hell to get this page to work the way I want it to.
Just throwing a quick note out there to let anyone who is following know that I am still fine-tuning the Tower and trying to finesse some of the less desirable traits out. As posted yesterday the circuit works and sounds killer, but one issue in particular needs to be fixed - When the controls are placed as follows: