Tubes- Most often used are the 01A/201A/301A type(s), but you can use type 30 also-IF all of the tubes used are type 30.
201A types use a 5 volt "A" supply. Your supply should deliver enough current calculated for .25 Amp per tube.
If you have only "B" supply, use 90 volts, although 45 will work at minimum performance. You can stack 9 volt batteries together (short term usage), or construct a "B" supply.
If you have more than 1 "B", such as if you have markings for "DET" & "AMP", use 45 volts on the detector, and 90 volts on the amp. If there is "RF", "DET", and "AMP" 45, 67.5 (approx), and 90 volts.
If you only have one "B" battery to address, try 45 volts first. The positive supply will attach to one side of the head phones, and the "-" will attach to "GND". Your antenna lead will attach to the first coil that has one unconnected lead/ winding (where the antenna attaches), and that same winding terminates to ground, which should make it easier to identify it with a meter.
The type 30 tube uses a 2volt "A" supply.
In both cases the "A" and "B" supplies are DC only.
: Looking for Marwol info- This 20's battery radio had (past tense) 5 4-pin tubes and has three tuners. I'm trying to restore, so I'd like to find out what 1. tubes this unit takes, and 2. what voltage the unit requires and 3. where the battery and antenna hookup. It is not the Marwol "Baby Grand" unit. It is a headphone jack unit(no speaker) with 2 battery control knobs.