Uploaded May 2021 | Updated September 2026, 18 minutes ago
In the early 1920s vacuum tubes and the circuitry to operate them were expensive items, so there was a great incentive to get the most bang for the buck out of each tube. As early as 1915, engineers realized that it was possible to have a single triode vacuum tube amplify audio and radio frequency signals at the same time. One of the more successful reflex radio kits was the Erla Superflex of 1924/25, but with the price of vacuum tubes dropping after an RCA patent expired, the reflex design became obsolete by mid 1925 and the TRF and superheterodyne took over the radio market.
If you enjoyed this video, consider becoming a member of the Antique Wireless Association at: antiquewireless.org/homepage/membership
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In the early 1920s vacuum tubes and the circuitry to operate them were expensive items, so there was a great incentive to get the most bang for the buck out of each tube. As early as 1915, engineers realized that it was possible to have a single triode vacuum tube amplify audio and radio frequency signals at the same time. One of the more successful reflex radio kits was the Erla Superflex of 1924/25, but with the price of vacuum tubes dropping after an RCA patent expired, the reflex design became obsolete by mid 1925 and the TRF and superheterodyne took over the radio market.
If you enjoyed this video, consider becoming a member of the Antique Wireless Association at: antiquewireless.org/homepage/membership
Subscribe to the Antique Wireless Museum channel and you'll receive news of our latest video uploads.
