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).
Sourcing a suitable rectifying valve for high tension insulation testing.
| Identifier | ExFiles\Box 41\2\ Scan085 | |
| Date | 2nd May 1930 | |
| X3646. Roy.{Sir Henry Royce} from EFC. EFCl/AD2.5.30. X,3646. RECTIFYING VALVE. For our high tension valve rectifying apparatus which we use for H.T. D.C. insulation testing, we have, as you know, made use of an Osram type U.3. valve. This type of valve however, has not been entirely satisfactory and for that reason we have asked the G.E.C. if they can supply us with one of these valves but slightly modified in the manner which we have described to them. We cannot get them to agree to do this and we have therefore come to the point where we are anxious to make enquiries of other makers say Messrs. Edison, B.T.H. Phillips etc. if they can supply a suitable valve of not too great dimensions. The electrical specification of our requirements is that the valve should be capable of a maximum output of 500 microamperes only and at the same time should be capable of withstanding a reverse pressure from filament to plate of 12,000 volts without the filament becoming bowed by static attraction. There is no necessity for our apparatus to have bigger ampere output, but the capability of withstanding the reverse pressure specified is essential. It has appeared to us that there would be a demand for a type of valve to this specification approximately and we think it quite possible that one may be available of other makers than the G.E.C. Will you please make the necessary enquiries. EFC. | ||