This is a monaural power amplifier that was installed in the highest quality battery pack released by RCA in the United States during the early days of radio broadcasting. It was inspected and maintained before being put up for sale. The balls used are 227, 250, and 281 x 2 all-nus tubes. I have seen amplifiers using 210, 245, and 2A3 as output tubes in high-end American RCA amplifiers in the past, but this is the first time I have seen a 250 single. It didn't sell because it could only be purchased by the first layer, so I immediately changed the bulb to a specification that reduced the cost, making it a rare amp with very few in existence). I connected a CD directly with a volume control and listened to it through a Vitabox or Lansing large speaker, and the midrange sounded thick and loud. Although it doesn't have a wide range, I think you can enjoy listening to music with a deep sound. I think it's an amp that goes well not only with large horn speakers, but also with full-range speakers such as Rouser, which have good transient characteristics. AC100V specification.
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