Mullard pentone

Made:
c. 1930s - 1940s in England
maker:
Mullard Limited

Mulland pentone DF 33 from National Valve Museum:

The DF33 is a variable μ RF pentode for dry battery operation. Mullard designate this device for service at both RF and IF in broadcast receivers. It was part of the 'red series' of valves that were first introduced in 1938. The relatively large size of the valve suggests that it was not designed for battery portable sets but for fixed operation. The filaments had to have the lowest possible consumption due to the cost of the dry batteries.

Details

Category:
Radio Communication
Object Number:
Y1984.48.269
Materials:
glass, metal (unknown), plastic (unidentified)
type:
pentone
credit:
Gift of Dr. G. R. Airth
status:
Permanent collection

Cite this page

Rights

We encourage the use and reuse of our collection data.


Data in the title, made, maker and details fields are released under Creative Commons Zero


Descriptions and all other text content are licensed under a Creative Commons Attribution 4.0 licence

Using our data

Download

Download catalogue entry as json

Download manifest IIIF

Our records are constantly being enhanced and improved, but please note that we cannot guarantee the accuracy of any information shown on this website.