DFA9 Mullard Onyx balloon – Radio Micro Special – Philips C507 – Vatea RV4100 REN904
Mullard balloon DFA9 GBP 250 pair.
Radio Micro “Special” GBP 50.
Vatea RV4100n= Telefunken REN904 GBP 60.
Philips C507 GBP 50.
Description
Mullard balloon DFA9 dates from 1928 and it is a dull filament amplifying valve. The filament itself is U shaped inverted and it is thoriated tungsten of the best quality.
The French made Radio Micro needs no introduction. It has been shown before and this is the “Special” version with its original box.
Vatea RV4100, equivalent to Telefunken REN904. Vatea was a Hungarian manufacturer of valves in the 1920s.
Last but not least a rare Philips metal base type C507
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