Yes, the SAMS Photofact shows two alternate power supplies, a transformer supply using 5V4G and 6X5GT rectifiers, and a series string supply using a 25Z6GT as rectifier and voltage doubler.
The manual makes no mention of a signal meter, but I assume yours is much the same television as the transformer version, only with the meter circuitry.
I will mail you a photocopy of the manual, per our separate email.
You found a rare bird! I will be interested to see a few photos after it is restored.
Regards,
Phil Nelson
Phil's Old Radios
http://antiqueradio.org/index.html