Hi Gerry/Mr Moe,
Yes, I guess that is correct – one definition of a ‘farm radio’ is that they are a subset of the ‘battery radio’ class. I would say that if we are being pedantic, such a radio would include a vibrator power pack to convert the 6v, 12v or 32v to a suitable high voltage for the B supply – I have one or two in my collection like that, eg. Zenith ‘cube’. However, the term ‘farm radio’ is generally used to encompass battery operated radios, even if they relied on high voltage battery as the B supply.