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![](/images/669.jpg) | Telmaco TDA1 & TA2 Radio & Amplifier | Telmaco TDA1 & TA2 Radio. The Telmaco TDA1 is a detector and one stage of amplification. The TA2 is two stages of audio amplification. They were manufactured by the Telephone Maintenance Co. in Chicago in the early 1920s. The Telmaco TDA1 and TA2 use 01A tubes.
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