The Gibson GA-75W was produced from 1950 to 1955 for a total of 1274 units according to shipping records. It uses 6L6 power tubes and 6SJ7 and 6SC7 preamp tubes to produce about 25 watts of output through an original Jensen P15N speaker. It’s got nice thick, dark cleans with a light touch but easily drives into breakup. Thick, squishy breakup.
This amp is in excellent condition and sounds fantastic, it’s got a great woody, bark to it when wound up to about noon. The speaker has been replaced and the amp has been recapped. The Iron appears to be stock (see photos above)