Use this in Google to fine manuals and schematics:
Epiphone junior amplifier manual Google zoeken
Most resistors are 1/4 watt, unless something is added in the schematic.
You also can deduce the wastage, because for every size is a wattage, or the other way around.
When you are not sure, and it fits, use a bigger resistor. The same resistance (ohm) but a higher wattage is no problem as long as it fits in the housing.
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