Most, if not all National amps I have ever had were Valco made. I believe N*D*C was National Dobro Company, and has a National Dobro Sticker on the speaker. Serial number is XXXXG-the G suffix, on the Valco site is mid to late 40's, on the National site is early 40's. Pretty durn clean, the can filter caps look to be replaced, but
I have not serviced it, or don't know if it has been serviced recently, but sounds great and works well. Two 6V6's, 2 6SC7's and 2 6J7 octal preamp tubes, and what looks like a giant 5U4 coke bottle rectifier, and all look to be original Radiotron tubes. Field coil speaker, in excellent shape. The original (look original) screws holding the metal back on are Phillips screws. It's a pretty stunningly clean example. Thanks for looking!
