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The HU8525 is a current stabiliser or Barretter. Traditionally the barretter was used to keep heater chain current constant over a range of fluctuations in mains voltage. The fine coiled wire is normally iron and the envelope is hydrogen filled.

See also H85-255/80 for a very similar Barretter.

The wire from the top of the central glass support to the top pip is for support and does not emerge from the glass.

A section of the filament showing the close wound coil. This looks to be a low current device possibly for HT stabilisation.

The wide glass tube envelope is 38 mm in diameter, and excluding the B4 base pins is 158 mm tall.

Reference: Observation.

Pin Connections