Yes Curt, I repair radios ,have been doing auto radios for about 40 years now ,do all of the radio work for a vintage GM truck parts supplier , got over 500 pre WWII home radios ,pick up my Transione at Hershey a few years ago ,fell in love with the old TRF uses 01A's and a 71A for the output, built like a 1926 Atwater Kent, found the schematic in "Gernsbeck" it's not in "Riders" I know of the portable you've got ,besides the old radios I have a 1929 Chevrolet, that's been in my family since new ,My "regular" car is a 1954 Plymouth, I love this old stuff , Thanks for your input ,BILL