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

TonyDuell · 27th Aug 2017, 4:07 pm

Actually, according to the 'valve museum' page, the U26 and the KY80 are equivalents. An article linked from one of those pages suggests a DY86 or DY87 can be used in place of them 'with a shortened life' (the filament of the U26 and KY80 is 2V, that of the DY86/7 is 1.4V). I've not tried it (not being a vintage TV person), but you might give it a go if you don't care if the DY86 burns out...

The 'portable' was the same chassis in a grey rexine-covered cabinet with a CME1703 CRT. There may have been other component changes, but it was the same layout, with the big dropper resistor mounted horizontally at the back and a big metal rectifier under the bottom chassis member. I don't remember it getting that hot, but I was quite young at the time and possibly though the heat was normal for a TV.

27th Aug 2017, 4:07 pm	#90
TonyDuell Dekatron Join Date: Jun 2015 Location: Biggin Hill, London, UK. Posts: 5,213	Re: Pilot PT650 "Spacemaker" Television Actually, according to the 'valve museum' page, the U26 and the KY80 are equivalents. An article linked from one of those pages suggests a DY86 or DY87 can be used in place of them 'with a shortened life' (the filament of the U26 and KY80 is 2V, that of the DY86/7 is 1.4V). I've not tried it (not being a vintage TV person), but you might give it a go if you don't care if the DY86 burns out... The 'portable' was the same chassis in a grey rexine-covered cabinet with a CME1703 CRT. There may have been other component changes, but it was the same layout, with the big dropper resistor mounted horizontally at the back and a big metal rectifier under the bottom chassis member. I don't remember it getting that hot, but I was quite young at the time and possibly though the heat was normal for a TV.