[Arran]

I measured -.5 volts using my Old Military VTVM TS-505.

According to schematic it should be -.2 Volts..

[Image: http://i292.photobucket.com/albums/mm38/...szm6qw.jpg]

These radio were run on 110 Volts AC  I think so with my voltage higher it should be more??  The B+ should be around 250 Volts  I measure about 330 volts.. I have a transformer I use on my 390's to step down the voltage .. I guess I will hook it up to radio to see what I get..

Anyway Radio work great..

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  I think that the discrepancy may be explained by the different readings you get from using a DMM/VTVM verses an old fashioned Volt-Ohm meter which was what they typically used in the 1930s, the types they used loaded down whatever they were trying to measure. Radios from then were designed around a working line voltage of 117 Volts, except for 25 cycle versions which were designed around 115, the only power grids that were a true 110 volts were the DC power grids in some major cities.
Just out of curiousity, have you checked the tubes? One thing that can cause a higher then normal B+ voltage is a weak power output tube, a weak tube conducts less current.
Regards
Arran