Those large D-batteries are rather expensive, so therefore : for how long do these batteries last (I may use the radio for maybe 1h/day) ? Is it worth the money buying rechargeable batteries ?
I ran mine on an unregulated plug pack for about a week or so. It’s not really suitable except for strong stations. I now use an old 12v regulated CB type supply with the output brought down to around 9v. Works a treat, but is expensive if you don’t already have a suitable supply handy as I did. Rechargeable batteries will eventually pay for themselves, but if you only use the radio for 1 hour a day, regular cells will probably be cheaper.