The information in the Data + Characteristics section of this tube is incorrect. The filament current is 0.12 A. This valve is identical to the 1M5G except for the base. See attached scan from the 1944 edition of the Radiotron Valve Data book.
- Radiotron valve data 1944 1M5G (24 KB)
Thank you for the suggestion. I have corrected from 0.2 to 0.12 A filament current.
The Radiotron valve data from the 1M5G you attached is from November 1940. Do you know when this valve was introduced to the market?
You can load up the sheet to the 1M5G which is often written as 1M5-G. You just click "Add information to tube" and then select "Data + characteristic". We are also missing a photo. When one of the pictures is up for a valve (tube) then it can be clicked directly from a model page if that model uses the valve.
This is a unique service for the radio collector - and for the valve collector. By the way: If you click "Tube ranking" at the main valve (tube) page then you see that the ECH81 (6AJ8) is still the most used valve in radios (we list) - 9560 model pages show that valve, followed by 7105 for ECC85 (6AQ8) and 6828 for the US valve 80.
I don't know when the 1M5G appeared exactly but it was used in the Mullard model 52 of 1937 (AORSM vol 1). The 1C4 appeared in 1935 so the 1M5G appeared no earlier that 1935 and no later that 1937. I'll upload the data shortly and a photo.