UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post

G6Tanuki · 11th Jun 2019, 5:45 pm

Those Thermistors/Brimistors are long since extinct. Yes, they lead a seriously-hard-and-hot life so tend to crumble if you look at them in the wrong way.

[In my case the wire-winding soldered to the plated ends had pulled the plating off the barrel of the Brimistor].

On my 840A I worked out the total heater-string voltage needed by the valves and then replaced the Brimistor with one of the ceramic-cased 5-Watt 'coffin' resistors of the right value. After three years of near-daily use like this - "Steady Eddy" being my bedside radio - no untowards side-effects have come to light.

11th Jun 2019, 5:45 pm	#36
G6Tanuki Dekatron Join Date: Apr 2012 Location: Wiltshire, UK. Posts: 13,998	Re: Eddystone 840C Those Thermistors/Brimistors are long since extinct. Yes, they lead a seriously-hard-and-hot life so tend to crumble if you look at them in the wrong way. [In my case the wire-winding soldered to the plated ends had pulled the plating off the barrel of the Brimistor]. On my 840A I worked out the total heater-string voltage needed by the valves and then replaced the Brimistor with one of the ceramic-cased 5-Watt 'coffin' resistors of the right value. After three years of near-daily use like this - "Steady Eddy" being my bedside radio - no untowards side-effects have come to light.