Interesting set indeed . I looked at the Nostalgia Air schematic and the first thing that caught my eye was the odd selection of tube base styles used . Exactly one 7 pin mini (6AG5 being used as the RF amp) and one Loctal (7W7 being used as the 2nd IF) with the rest being Octals .
I was also kinda wondering about the single 5Y3 being asked to feed all the tubes' B+ , and do it with enough power to produce decent sound from the pair of 6V6s ....