Just picked up a 1930s Battery operated Coronado

[vortalexfan]

Originally Posted by Electronic M

Both at once...

Are you sure the two batteries should be connected in parallel? Because I'm only getting 1.5 volts connecting them that way...

I've also tried connecting 2 sets of D batteries in parallel and I'm only getting 1.4 volts, so not even close to the correct amount of volts needed to power the radio's filiments...