Object Details
- Sonatron Tube Company
- Description (Brief)
- A resistance-coupled audio amplifier designed to replace transformer coupled stages in a broadcast receiver, or to operate as a straight audio amplifier following a standard detector. The manufacturer supplied a type MJ-X6 (red) tube, a type MJ-X30 (silver) tube, and a type MJ-X20 (blue) tube. Tube designation denotes amplification factor. Includes original package and instruction booklet.
- Transformer coupling in audio amplifiers was introduced by De Forest as early as 1912. The simplicity in design of such units led to their popularity during the 1920s. However factors such as bulkiness and poor frequency response eventually led to resistance coupled units. With the advent of high gain tetrode and pentode tube types, transformer coupling became generally obsolete with the exception of impedance matching transformers in the audio output stage of receivers.
- Location
- Currently not on view
- Credit Line
- from Franklin Wingard
- 1924
- ID Number
- EM.321490
- catalog number
- 321490
- accession number
- 241556
- Object Name
- Amplifier
- amplifier kit
- radio amplifier
- audio amplifier
- Other Terms
- Amplifier; Radio
- Measurements
- box: 2 1/2 in x 9 7/8 in x 8 5/8 in; 6.35 cm x 25.0825 cm x 21.9075 cm
- See more items in
- Work and Industry: Electricity
- National Museum of American History
- Record ID
- nmah_709746
- GUID (Link to Original Record)
- https://n2t.net/ark:/65665/ng49ca746a5-35eb-704b-e053-15f76fa0b4fa
