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).
Correspondence with the General Electric Co. Ltd. about a new power rectifying valve.
| Identifier | ExFiles\Box 41\2\ Scan030 | |
| Date | 4th November 1926 | |
| X3646. EFC. from Wd.{Mr Wood/Mr Whitehead} Wd{Mr Wood/Mr Whitehead}6/NJ4.11.26. Upon receipt of EFC3/T15.10.26 we wrote the General Electric Co.Ltd. at their Birmingham address asking them for the desired information regarding Power Rectifying Valves. Our letter was acknowledged and we were informed that same was being forwarded to the Head Office for attention. At a later date we received a letter from Magnet House, Kingsway, London, saying that our enquiry was being put up to their Works. We are now in receipt of a further letter from Magnet House, as follows:- "We feel that you will be interested in a new valve which has recently been designed by us, designated the OSRAM E.H.T.No.2. "This valve has been designed with a low filament wattage suitable for supplying anode currents which are "not required to be in any degree considerable, such as "for insulation testing purposes. "The valve can be run from a 4 volt accumulator, with a small fixed resistance of approximately 1.2 [handwritten '12'] ohms in series; for your purpose the emission at 3.7 volts would be ample. The filament current at this voltage is approximately 2.5 amps. "The maximum reverse voltage on which the valve is tested is 40,000, and as at the moment the valve is not being capped, it will be necessary to support this by some form of insulating tube in the end wells. "If you are interested in this valve, we shall be "glad to hear from you, and hope to have the pleasure of quoting you for supply." If this valve meets your requirements as set out in yours of 15th ult. and you would like to have a quotation for same, I will apply to the G.E.Co. for such quotation. [Handwritten initials] WdG | ||