RE504 Telefunken – Ediswan balloon – Frelat balloon top pip – Mullard R type – Pair Frelat brass base top pip valves

Description

This section shows:

Telefunken RE504 power triode valve working at 3.5 Volts filament top pip.

Ediswan PV504 triode power output.

Mullard R type long thin shape metal base top pip power valve bright emitter.

Frelat balloon top pip audio power valve 4 volts filament.

Pair of brass base Frelat audio power output valve top pip extremely rare.