18-09-2016, 09:28 AM
(This post was last modified: 18-09-2016, 09:29 AM by Geordie McBoyne.)
Hi Trevor,
I remember the older GEC 14" you mentioned in your reply to the BT310 topic.
A popular model was the BT1746 which was an early two band receiver. That set employed the type 305 barretter to stabilise the 0.3amp heater chain. This component was often unreliable and the GEC service department supplied a replacement dropper resistor which was mounted on the ES cap. In theory the barretter was a good idea being a device having an iron filament in a hydrogen filled bulb.
From the Radiomuseum: http://www.radiomuseum.org/tubes/tube_305.html
Geordie McBoyne.
I remember the older GEC 14" you mentioned in your reply to the BT310 topic.
A popular model was the BT1746 which was an early two band receiver. That set employed the type 305 barretter to stabilise the 0.3amp heater chain. This component was often unreliable and the GEC service department supplied a replacement dropper resistor which was mounted on the ES cap. In theory the barretter was a good idea being a device having an iron filament in a hydrogen filled bulb.
From the Radiomuseum: http://www.radiomuseum.org/tubes/tube_305.html
Geordie McBoyne.
