Technical manual sylvan i a radio tubes a technical publication of. The 7n7 is identical to two type 7a4 tubes and reference is made to that type for curves, and resistance coupled data on. Ge essential characteristics, the whole 228 page book in an indexed pdf file big, 11mb. Mullard magic stocks vintage radio, military radio like r1155, t1154, ws19, military spare parts, valves, tubes by gec brimar mullard ecc83 kt66 ecc32 u52, radio components early wireless, vintage radio, domestic vintage radio, old technology of all kinds. The ux201a gained some popularity recently and is used in line preamplifiers. This is thomas mayers blog about vacuum tube audio, to share updates about new amplifiers and preamplifiers and elrog vacuum tubes. Vacuum tube 7a4 xxl, triode, mediummu antique electronic. It is designed for use as an oscillator, detector, or amplifier. Lawrence berkeley national laboratory introduction. This tube was introduced as detector and amplifier triode. Nos tube specification sheet nos tube specification sheet. Tabulated data for resistance coupled operation will be. Sylvania type 7a4 is a mediummu triode designed for use. The information in the sylvania tube substitution manual is furnished without assuming any.
See the cunningham data sheet for all technical parameters of this tube. Although often listed as technically identical this data sheet shows a slightly higher plate resistance and also a variation of the amplification factor over the operating points. The ux112a shares the same ux4 socket and pinout with the ux201a as. Factor 20 20 for resistance coupled data, refer to type 7a4 in appendix. This is a list of vacuum tubes or thermionic valves, and lowpressure gasfilled tubes.
This series consisted of the xxb, xxd, xxfm and xxl with the latter being a near equivalent of the 7a4. This website is 3 years old with over 5000 tube types in almost 4000 datasheets. Within each of the data sections of this handbook, data are presented by. With almost datasheets and the visitor counter indicates over 4000. A flat sheet beam is electrostatically deflected across the anode which is. Substitutes are given as a guide only please refer to original manufacturers data sheets to ensure that a substitute is safe and appropriate for your application. Sort by featured best selling alphabetically, az alphabetically, za price, low to high price, high to low date, new to old date, old to new. Bold designators are close or identical, italic designators are different ratings, different pinouts or different filament voltages. The 12volt 300 ma filament equivalent is the 12sn7gt or 12sn7gta. Xray properties of elements electron binding energies xray energy emission energies fluorescence yields for k and l shells principal auger electron energies. Tube 7a4 or rohre 7a4 id3559, triode, vacuum, loctal8, b8g sylvania, 1938 and universal. Test data for hickok 539b and 539c tube testers author.