[NostalgiaRadioTime]

These are nice looking sets. Looking at the schematic, I see it uses the same 1.5V A Supply / 90V B Supply set up as the 39-70 I just finished (actually the schematic looks very similar altogether). Since that power supply worked so well on mine, that could certainly be an option for this set as well (should the owner want to do away with batteries and make it an AC set). Your schematic for the power supply was a winner!

I had the same issue on mine with that off/on flag. It took some coaxing to get it to work properly. And I'm glad I'm not the only one who hates the troublesome loctal sockets.