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The "Tom Thumb 528", "Firestone TT-528" portable tube radios and the "Tom Thumb TT-600 Hybrid" tube transistor radio have been manufactured since 1956 by Manufactured by Automatic Radio Mfg.
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Co., Boston.
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The models are assembled according to the general superheterodyne scheme, except for the ULF terminal block.
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In the first two models of radio tubes there are 5, 3 in the HF part and 2 in the final amplifier.
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The latest model has 3 radio tubes in the HF part and 2 transistors in the final ULF.
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The food is different.
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The first two models use two batteries, 45 and 1.5 V. The latest model has one 45 and one 4 V. The first two receivers have a maximum output power of 80 mW, the last 120 mW.
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Dimensions of radio receivers 152x95x40 mm.
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