GEC Dual Standard Colour - Page 2 - UK Vintage Radio Repair and Restoration Discussion Forum

Top Cap · 15th Sep 2015, 5:35 pm

Aquadag connection? Could be the PL509 Barkenhausen. The later ones had a conductive ring on the glass but with early ones we placed a grounded single turn of tinned copper wire around the glass and adjusted for minimum striations. Lol what days!

Niechcial,Steve · 15th Sep 2015, 7:03 pm

I have tried a couple of PL509s (both with rings). I'm going to order myself some ferrite beads and give that a go. Thanks for all the help.
Steve

Peter.N. · 16th Sep 2015, 9:57 am

This is a watery line down one side? I'm sure i found a cure for it but sadly still can't remember what it was.

Used to live not to far from you in Petts Wood.

Peter

gec2110 · 17th Sep 2015, 4:40 pm

If it is not the obvious 1.5K resistor across the line lin coil, I think it has something to do with the screening can and the top caps of the PL/PY.

A stray earth point? Just a thought.

Niechcial,Steve · 18th Sep 2015, 10:22 pm

I've tried all the suggestions now, plus some ferrite beads and extra damping on the scan coils and lin coil- all to no avail. Given the service manuals comments on this issue I've come to the conclusion that most likely production tolerances on the LOPT in particular produces this fault on a number of sets.
Thanks for all the help.
Steve
P.S. Peter N.- Can we try hypnosis to get the secret out of you? (only joking!)

15th Sep 2015, 5:35 pm	#21
Top Cap Octode Join Date: Mar 2006 Location: Watford, Hertfordshire, UK. Posts: 1,270	Re: GEC Dual Standard Colour Aquadag connection? Could be the PL509 Barkenhausen. The later ones had a conductive ring on the glass but with early ones we placed a grounded single turn of tinned copper wire around the glass and adjusted for minimum striations. Lol what days! __________________ Whether the Top Cap is Grid or Anode - touching it will give you a buzz either way!

15th Sep 2015, 7:03 pm	#22
Niechcial,Steve Hexode Join Date: Jan 2007 Location: Beckenham, London, UK. Posts: 373	Re: GEC Dual Standard Colour I have tried a couple of PL509s (both with rings). I'm going to order myself some ferrite beads and give that a go. Thanks for all the help. Steve

16th Sep 2015, 9:57 am	#23
Peter.N. Dekatron Join Date: Jul 2008 Location: Charmouth, Dorset, UK. Posts: 3,601	Re: GEC Dual Standard Colour This is a watery line down one side? I'm sure i found a cure for it but sadly still can't remember what it was. Used to live not to far from you in Petts Wood. Peter

17th Sep 2015, 4:40 pm	#24
gec2110 Retired Dormant Member Join Date: Feb 2008 Location: Croydon, London, UK. Posts: 408	Re: GEC Dual Standard Colour If it is not the obvious 1.5K resistor across the line lin coil, I think it has something to do with the screening can and the top caps of the PL/PY. A stray earth point? Just a thought.

18th Sep 2015, 10:22 pm	#25
Niechcial,Steve Hexode Join Date: Jan 2007 Location: Beckenham, London, UK. Posts: 373	Re: GEC Dual Standard Colour I've tried all the suggestions now, plus some ferrite beads and extra damping on the scan coils and lin coil- all to no avail. Given the service manuals comments on this issue I've come to the conclusion that most likely production tolerances on the LOPT in particular produces this fault on a number of sets. Thanks for all the help. Steve P.S. Peter N.- Can we try hypnosis to get the secret out of you? (only joking!)