The answer is yes it can be converted. It's a simple matter of rewiring in the power supply and changing the vibrator to a 12 Volt unit. Some series resistance needs to be added to the power transformer's primary winding and the the tubes need to be changed to ones with 12 volt filements or wired in series pairs if there is an equal number of them. I usually eliminate the HV rectifier tube and replace it with a diode of higher current and voltage rating. That just makes one less tube filement to draw down your battery. You will not need to isolate the radio or antenna if you do this conversion. Occasionally I do these conversions but it usually amounts to fifty bucks in parts and one hundred bucks for labor. In the long run youn might just be better off getting one of the 12 V. repros which also has the FM stereo. Isolating everything usually ends up in disater with a fire. For one thing all the buttons and ***** are hot in respect to ground. Isolating the antenna shield also greatly effects the reception and sometimes eliminates it. Hope this helps.

Later man...