This is an Engineering prototype. I thought it was to be a TR-7B, to replace the TR-7A. But when I mailed the information and pictures of it to the former Drake employee Mike Elliot, he wrote back: “Sindre -That sounds and looks like an early prototype of the DRAKE TR-8.  I think there were quite a few made for field testing, and you apparently have one. Mike Elliot” So what you see is the prototype of the DRAKE TR-8 transceiver!!!! It is like a TR-4310, but in a TR-7 case. It has a VRTO for tuning. It has the upgraded PCB boards that the TR-7A contained. It also has a noise blanker, and a full compliment of filters (6KHz, 1.8KHz, and 500Hz). An AUX-7 is installed with BCB modules. The VRTO comes up in the middle of the selected band. It has up and down, but no STORE. Instead this button functions as a LOCK. The VRTO board does not offer an external counter input, so the rear switch and connector associated with this feature are not present. The Drake RV75 VFO works with it.