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D.E.R. Marconi Osram MO-V top pip - BTH British Thompson Houston B5

D.E.R. Marconi Osram MO-V top pip - BTH British Thompson Houston B5 - Image 2

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D.E.R. Marconi Osram MO-V top pip – BTH British Thompson Houston B5

DER Marconi Osram Top Pip black base £ 200 pair.

DER Marconi Osram Top Pip nickel base £ 300 pair.

B5 BTH British Thompson Houston £ 120 pair.

Category: Audio output Triodes II

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Description

This section shows a pair of BTH type B5 and two pairs of Marconi-Osram type D.E.R.

D.E.R Top pip metal base

D.E.R. Top pip black base

Both valves are the same. D.E.R. Dull Emitter Receiving is a triode with thoriated filament

The BTH type B5 is a general-purpose triode produced fron 1923.

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