Particulars and results of a test on an Osram U4 Rectifying Valve.
| Identifier | ExFiles\Box 41\2\ Scan041 | |
| Date | 11th December 1926 | |
| X3646. OSRAM U4 RECTIFYING VALVE. 11.12.26. Particulars and results of test :- R.M.S. A.C. supply volts 189 at 50 periods. Terminal filament volts maintained at 6.0. Observations of rectified delivery against varying D.C. E.M.F's :- D.C. Volts. Milli-ampere delivery. Remarks. 204 9 177 17 } Nearly steady. 158 24 144 29 130 32½ -> 34½. } Noted tendency to rise. 118 35 107 37 } Fairly steady. 85 40 52 43½ } Small tendency to fall. 20 47 } Tending to fall. 0 49 } Allowed to fall as far as 34 m.a. 0 34. 52 29 -> 26.5 } Still falling. 108 22 132 21 } Steady. 158 17 204 8+ 156 18 130 22½ } Shews some recovery. 105 26 54 32 125 24 119 25½ 119 27 120 28½ } Observations at quarter hour intervals shewing some recovery. Filament and back D.C. volts on but A.C. volts off during intervals. 120 29 119 30 123 30 30 30 30 30 102 36 -> 34 Next day. Slight further recovery. EFC. {E. Fowler Clarke - Electrical Engineer} | ||
From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).