The 329 is a barretter or current stabiliser for use on heater chains to reduce the switch-on surge and consequent damage to heaters.
This barretter has three pins and a centre tapped filament.
The single strand iron wire is looped over the support hooks that are mounted on the central glass stem. The wire is held by being clamped into a fold of the support rods.
The wide glass tube envelope is 33 mm in diameter, and excluding the B9A base pins is 96 mm tall.
Absolute Maximum Operating Conditions¶
Updated June 30, 2017.