[Milsurplus] "conversions to boat radios"

[Hubert Miller]

On antiqueradios.com I started a thread about what to do with the old 2 MHz AM boat radios.
One of the replies included this:

"Pat W5THT 
P.S. The HF radios I saw being used by shrimp boats on the gulf of Mexico in the early 1960s were all converted surplus with the ten volt final and modulator tubes run on 12 volts (3 tubes in series across ships battery 36 volts). They had nice paint jobs outside and the bandswitches were ganged together with metal bars across the tuning unit front. Thanks for the memories..."

Ten volt tubes would have to be the BC-375. But it doesn't have any bandswitches. What do you think he's remembering?  I did ask again; maybe more forthcoming.
-Hue