Granada Television Brochure, 1970s
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Philips N1500 Warning!
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Want to tell us a story?
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Remove Teletext Lines & VCR Problems
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1969 Philips G22K511
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Radios-TV on YouTube
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Music centre modifications
Unusual record player modification
B&K 467 Adapters
Mishaps In The Trade
1971 Beovision 3200
1971 Bush CTV1120
Granada Television Brochure, 1970s
Long Gone UK TV Shops
Memories of a Derwent Field Service Engineer
PYE Australia Circa 1971
Radios-TV VRAT
Fabulous Fablon
Thorn TX10 Chassis
Crusty-TV Museum, Analogue TV Network
Philips N1500 Warning!
Rumbelows
Thorn EMI Advertising
Thorn’s Guide to Servicing a VCR
Ferguson 3V24 De-Robed
Want to tell us a story?
Video Circuits V15 – Tripler Tester
Thorn Chassis Guide
Remove Teletext Lines & VCR Problems
Ceefax (Teletext)
Suggestions
Website Refresh
Colour TV Brochures
1970s Lounge Recreation
CrustyTV Vintage Television Museum
Linda Lovelace Experience
Humbars on a Sony KV2702
1972 Ultra 6713
D|E|R Service “The Best”
The one that got away
Technical information
The Line Output Stage
The map
Tales of a newly qualified young engineer.
Tales of a Radio Rentals Van Boy
Sanyo SMD
Disastrous Company Rebranding
1969 Philips G22K511
Memories Of The TV Trade
Crazy house
Dirty TV screens
Dual Standard and Single Standard CTV’s
Radios-TV on YouTube
The Winter of 62/63
A domestic audio installation
1979 Ferguson Videostar Deluxe 3V16
Music centre modifications
Unusual record player modification
B&K 467 Adapters
Mishaps In The Trade
1971 Beovision 3200
1971 Bush CTV1120
Test Equipment Leader LCG-399A pattern generator, transformer mains input
Looking for some transformer advise on a Leader Pal LCG-399A pattern generator. The mains input plug is obviously intended for the US market but a quick check of the transformer reveals possibly a solution on the taps. Has anyone encountered the markings or how best should I tackle the 240 volts in, cant get my head around the resistances Not been able to source a manual Resistances between terminals; 1 & 4 linked neutral in 3-& 6 linked live in 1-2 50 Ohms 2-3 17 Ohms 1-3 50 Ohms 4-5 49 ohms 4-6 50 ohms 5-6 15 ohms
Hi Stephen, it looks like 2 of 120v windings in parallel, this would make sense for US use. Connecting those 2 windings in series would then work on 240 v, but beware of phasing. Might be better to try feeding in 120 and measuring the secondary voltage. Then disconnect the sec winding from the rest of the set to allow you to experiment with tappings. Beware also of false readings of resistance. Digital meter bad, AVO8 good !. Be careful not to connect the 2 primaries in series opposition, this can overheat and destroy the tx very quickly. I,m no great fan of a series lamp limiter but this would be an ideal use, if the lamp lights with no load on the sec, the primaries are probably in opposition.
Peter
Thanks Peter, couldn't quite get my head around it and what you say makes perfect sense of course.
Will have a go at that soon, its working fine on an external transformer presently......even if the colour on the ITT CVC is not.
Live to 6, Neutral to 1, join 3 and 4. Job done Test with a lamp limiter, as Peter says. Use the smallest bulb you have - no more than 40W. The tappings on pins 2 and 5 are probably for 110/220V use. I agree that the DMM might be confusing the issue somehow, although it's not something I experience. Perhaps if it is pulsing the test current? Normally a DMM supplies a known (and steady) DC current.
I use a fluke 117 true RMS which seems fine on AC but I know what you mean about spurious readings. Thanks for taking the guess work out Mark. Couple of pictures
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