Here is another one of my artist projects that I built during my 11 years working at Mojotone. Audley Freed reached out about having an amplifier built that was voiced in the Vox family. He was looking for less volume than the AC30 but with the chime and crunch of the top boost channel. The NC3015 amp kit, another one of my amp kit designs, was suggested and sent out to him to check out.
The NC3015 Kit

The NC3015 was a kit that I designed to fill a gap in the British amp kits that Mojotone was marketing. The idea was to meld together the AC15 and AC30 circuits, combining the parts of the amps that players loved. So it came with the Normal and Top Boost preamp channels of the AC30 and mated that with the power supply/output section of the AC15. The kit gave players the great sound of the big AC30s but with a less ear-crushing volume that fits on quieter stages. The kit originally used the Heyboer 18-watt power transformer, the Heyboer AC15 output transformer, as well as a choke for the circuit, but was revised after my departure to use the 18-watt output transformer and no choke to save on chassis updates/modifications. I went with the classic Mojo Dijon caps to get as close to the old mustard caps that Jennings and Vox used back in the day.
First Revision
After a little bit of time with the amp and a few emails in between, he sent the amp back for some modifications to better fit what he was looking for. The first thing he wanted was more headroom out of the amp. Given the EL84s were pretty much at max, I had to go with a bigger tube. So, with a quick modification to the chassis, I installed 6V6s for a little more oomph to the output and adjusted the bias to make them sing. He said he never used the normal channel and wanted to see if I could modify that in some way to be a foot-switchable boost. I tweaked the faceplate to match what he was looking for. After some playing around with the circuit, I had it dialed into what he was looking for: a simple adjustable boost to hit the front end of the Top Boost channel. The gain stage was tweaked to have more midrange character like a tube screamer to push the preamp into crunch. The amp was then sent out for Audley to put it through its paces.
Second Revision
After spending some time playing through the amp, he had some tweaks that he wanted to update the amp with. First up, adjusting the boost stage for less overall gain and adding a master volume for when the boost was engaged. This gave better control of the output of the amp when the boost was engaged.
Final Revision and Thoughts
A few more tweaks were made to the cicuit for gain and volume to meet what he was looking for. This was the final revision that was sent out to Audley for his feedback, unfortunetly nothing ever became of the amplifier to go into production or have another one made.