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 Decca colour television Australia
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 Return to top of page · Post #: 1 · Written at 2:32:56 AM on 1 April 2014.
Jgasdj's Gravatar
 Location: Lake Macquarie, NSW
 Member since 1 April 2014
 Member #: 1539
 Postcount: 24

Hello , I used to have a old Decca colour TV from 1973, ( Bradford 30 chassis I think ), I used to have a lot of burned out LOPT in these sets , anyone else have these problems with these colour sets ?. ( used to have a PL509 and a py500a ). I would like to hear of anyone who had similar problems with these colour sets back from 1973. thanks.

 Return to top of page · Post #: 2 · Written at 2:50:37 PM on 21 October 2014.
Jgasdj's Gravatar
 Location: Lake Macquarie, NSW
 Member since 1 April 2014
 Member #: 1539
 Postcount: 24

Anyone have similar problems with the line output transformers in the decca hybrid sets from 1973? Please I would really like to hear from you guys? Thanks

 Return to top of page · Post #: 3 · Written at 9:30:07 PM on 21 October 2014.
GTC's avatar
 Location: Sydney, NSW
 Member since 28 January 2011
 Member #: 823
 Postcount: 6237

Would probably get more notice if posted in the Television section.

 Return to top of page · Post #: 4 · Written at 9:00:58 PM on 22 October 2014.
TV Collector's Gravatar
 Location: Ballarat, VIC
 Member since 4 January 2011
 Member #: 803
 Postcount: 456

I'm too young to have any first hand experience with the old Decca / HMV hybrid sets. I don't believe that they were particularly bad for burning out LOPT's but I do know that they were prone to faults that caused the line drive stabilisation to fail causing high EHT which would lead to repeated tripler and LOPT failure if not fixed.
The problem was due to the type of resistors used in the set. Without fail they drifted high in value and a critical width stabilisation resistor had a habit of going open circuit.

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