View Single Post
Old 13th Aug 2017, 5:28 pm   #28
Heatercathodeshort
Dekatron
 
Heatercathodeshort's Avatar
 
Join Date: Jun 2005
Location: Warnham, West Sussex. 10 miles south of DORKING.
Posts: 9,145
Default Re: And the next one! a GEC BT2147

The standard GEC band 3 converter had two B7G adaptors that plugged into the RF position to gain power, heaters and H.T. and the second to feed the IF signal to the mixer now acting as an additional IF amp.

It's my guess that when GEC modified the RF plates, converting them to IF plates, they used a similar arrangement. This would have been very convenient as no modifications would have been needed to the heater ballast resistor.

I think the IF frequency is 34/38 mc/s so virtually any tuner from 1956 could be wired in. J.
Heatercathodeshort is offline