UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post - What are the chances of a modern LOPT failing?

Maarten · 3rd Dec 2017, 9:50 pm

The ones going short between primary and secundary low voltage winding, were the small grey ones for 90 degree deflection sets throughout the 1990's. I think they were in the AT2079/AT2094 series and the fault was common in a few variations of these for several years before the design was presumably changed.

Another notable problem were insulation faults in the EHT section, giving sever flash overs and resulting damage. Orega DST's fitted mid to late 1980's to the ICC5 chassis, particularly in the Telefunken version I think, and around 1992 Eldor DST's fitted in the Philips GR2.2 chassis were prone to this.

Apart from that, there was always a few percent chance of a LOPT failing in general. Mostly developing shorts in the EHT secundary or rectification.

3rd Dec 2017, 9:50 pm	#9
Maarten Dekatron Join Date: Dec 2007 Location: Haarlem, Netherlands Posts: 4,199	Re: What are the chances of a modern LOPT failing? The ones going short between primary and secundary low voltage winding, were the small grey ones for 90 degree deflection sets throughout the 1990's. I think they were in the AT2079/AT2094 series and the fault was common in a few variations of these for several years before the design was presumably changed. Another notable problem were insulation faults in the EHT section, giving sever flash overs and resulting damage. Orega DST's fitted mid to late 1980's to the ICC5 chassis, particularly in the Telefunken version I think, and around 1992 Eldor DST's fitted in the Philips GR2.2 chassis were prone to this. Apart from that, there was always a few percent chance of a LOPT failing in general. Mostly developing shorts in the EHT secundary or rectification.