I couldn't resist… I bought… It turned out that it had already been repaired and was not qualified enough. I had to replace two radio lamps and restore the original installation. Last week, I received radio lamps bought not on Ebay and dared to carefully test my purchase … A few words in this short review… The device is very perfect for radio receivers of the 20s. Two resonant cascades of a high-frequency amplifier, a "far-near reception" sensitivity switch, a two-stroke powerful low-frequency amplifier with a sky-high for those times power of approximately 5…6 watts. For the radio of 1928..29, it was something fantastic.