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FERNSEH · 27th Jan 2018, 11:21 pm

Worth bearing in mind that the CME1901 has a 114 degree deflection angle whereas the CME1903/AW47-91 it is 110 degrees. For replacement purposes this shouldn't matter. CME1901 has a 12.6volt 0.3amp heater and the CME1903 is 6.3V. Full agreement with JCB, to do the tube substitution job properly a 21ohm 3watt resistor should be inserted into the heater chain. The AW47-90 has a long neck and if one can found it is a good replacement for the CME1901.

DFWB.

27th Jan 2018, 11:21 pm	#3
FERNSEH Dekatron Join Date: Mar 2005 Location: Gateshead, Tyne and Wear, UK. Posts: 7,444	Re: GEC BT336 possible tube change Worth bearing in mind that the CME1901 has a 114 degree deflection angle whereas the CME1903/AW47-91 it is 110 degrees. For replacement purposes this shouldn't matter. CME1901 has a 12.6volt 0.3amp heater and the CME1903 is 6.3V. Full agreement with JCB, to do the tube substitution job properly a 21ohm 3watt resistor should be inserted into the heater chain. The AW47-90 has a long neck and if one can found it is a good replacement for the CME1901. DFWB.