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

cmjones01 · 26th Apr 2017, 11:00 am

The EC52 and EF54 (VR136 and VR137, I think) were used in the ex-GEE RF units (RF26, RF27, R1355) which were popular for converting into TV receivers post-war. Perhaps the retuning to the higher frequency of the Birmingham transmitter needed the extra performance of these valves? I think the EF54 was an improved version of the EF50, able to deliver more gain at higher frequencies.

Chris

26th Apr 2017, 11:00 am	#26
cmjones01 Nonode Join Date: Oct 2008 Location: Warsaw, Poland and Cambridge, UK Posts: 2,681	Re: HMV 1804 Television. The EC52 and EF54 (VR136 and VR137, I think) were used in the ex-GEE RF units (RF26, RF27, R1355) which were popular for converting into TV receivers post-war. Perhaps the retuning to the higher frequency of the Birmingham transmitter needed the extra performance of these valves? I think the EF54 was an improved version of the EF50, able to deliver more gain at higher frequencies. Chris __________________ What's going on in the workshop? http://martin-jones.com/