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

TriMan66 · 1st May 2011, 3:58 pm

Hi All,

Thanks for the comments.
Still no luck. All high value resistors are within 5%.
All wax caps have been replaced.
I fixed some wiring and resistors around the vertical height section which is now working.
But its still low on EHT I fear and the boost volts are quite low at around 450V.
I did have them up to 530V and brighter picture, but that was before I moved C86 on the LOPT from pins 4/8 to pins 3/7 as it says on the circuit diagram.
The small spark I can draw from the DY86, the low boost volts and the picture brightness, seem to imply low EHT, but I still haven't found the cause.
I'm going to try another cable loop for the DY86 heater. One without a sheilding braid.
Any other comments are welcome.

regards
Craig

1st May 2011, 3:58 pm	#18
TriMan66 Pentode Join Date: Jun 2009 Location: Royston Posts: 120	Re: Help with a HMV TV Hi All, Thanks for the comments. Still no luck. All high value resistors are within 5%. All wax caps have been replaced. I fixed some wiring and resistors around the vertical height section which is now working. But its still low on EHT I fear and the boost volts are quite low at around 450V. I did have them up to 530V and brighter picture, but that was before I moved C86 on the LOPT from pins 4/8 to pins 3/7 as it says on the circuit diagram. The small spark I can draw from the DY86, the low boost volts and the picture brightness, seem to imply low EHT, but I still haven't found the cause. I'm going to try another cable loop for the DY86 heater. One without a sheilding braid. Any other comments are welcome. regards Craig