LS5A balloon Marconi Osram – LS1 Marconi Osram balloon pip top very rare valve

Description

This section shows two very interesting and rare set of valves.

Marconi Osram LS5A tall glass balloon with lower impedance than the LS5 counterpart . The LS5A is able to provide a higher output and it is used on many DIY amplifier with stunning results.

The Marconi Osram type LS1 it is dated 1923 and it was one of the first receiver valve amplifier. This is the top pip version that shows an early design.