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.
- Radio Communication
- Object Number:
- Gift of Dr. G. R. Airth
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