Re: What are the chances of a modern LOPT failing?
I'm surprised at people saying they rarely had a diode-split LOPT fail. Along with most others in the trade we certainly did!
Top of the list? Philips CP90 and the similar grey ones as Derrick mentions. A squealing CP90 always had me looking at the shelf before the back came off.
Runner-up? Green spot TX100 (we bought these in tens) and the red spot one fitted to the ill-advised 20" TX90.
Then the Hitachi CPT2174 series - we changed loads of these, possibly as we were (in fact probably are!) Hitachi dealers. The one fitted to the 2476/8 was much more reliable. However we never had to change one (except by mistake) in a CPT 2196 series, though I bet they were made by the same manufacturer.
Best ones? G11 and K30 - K40 without a doubt (if we exclude the EHT lead) and similar cream coloured ones in B&O and GEC sets. Also TX9 and 10s were good.
I still have a pile of yellow HR and Konig boxes with new LOPTs I'll never use. Oh well....
Glyn
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