23-10-2012, 10:01 AM
(23-10-2012, 09:18 AM)pwdrive Wrote: Apparently most of the valves for the R1155/T1154 were made at MOV's factory at Shaw, Oldham. There is a book about the MOV Co.
Lawrence.
Just another thought, the BL63 seems to have a high heater current?
I would have thought that current consumption on an airborne receiver would have been designed to be a minimum?
As far as I can see the BL63 in the R1155 is primarily a switching device?
Would the fact that it was a switching device have anything to do with the high heater current? ie: cathode temp?
Would this suggest that other twin triodes just weren't suitable?
Maybe the BL63 was developed purely for its switching function in a DF circuit and that the MOV Co. kept their in house number (BL63) for other reasons, the various Marconi companies were very astute back then when it came to buisness and finance.
Just throwing stuff up in the air for comments.
Lawrence.
