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Ed_Dinning · 8th Dec 2017, 9:38 pm

Hi Argus, there was an article in Radio Bygones in Autumn 2016 that gave the winding details.

Totally agree about the pitch cracking and removal, but not necessary to remove it ti get at the primary. Note that some transformers have the EHT heater winding on a separate ceramic tube, glued on with pitch.
The overwind connects to pin4 and the PL38 anode: 1040 turns, tap (pin 5) for metrosil then 310 turns and the line lin coil (pin 6)

pin 3 boost anode, 630 turns tap pin 2 to width coil, 60 turns pin 1 to HT

A wire 0.25mm dia

Note that there is an offset start or finish on one winding and this together with the amount of insulation used can affect the coil self capacitance.

Ed

8th Dec 2017, 9:38 pm	#38
Ed_Dinning Dekatron Join Date: Jan 2004 Location: Newcastle upon Tyne, Tyne & Wear, UK. Posts: 8,195	Re: Bush TV22 spares availability? Hi Argus, there was an article in Radio Bygones in Autumn 2016 that gave the winding details. Totally agree about the pitch cracking and removal, but not necessary to remove it ti get at the primary. Note that some transformers have the EHT heater winding on a separate ceramic tube, glued on with pitch. The overwind connects to pin4 and the PL38 anode: 1040 turns, tap (pin 5) for metrosil then 310 turns and the line lin coil (pin 6) pin 3 boost anode, 630 turns tap pin 2 to width coil, 60 turns pin 1 to HT A wire 0.25mm dia Note that there is an offset start or finish on one winding and this together with the amount of insulation used can affect the coil self capacitance. Ed