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Forum Free Registration Closed
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
CTV Switch mode power supply for the Philips G8.
I was given this Philips switched mode power supply unit for a future project. The plan is to modernise a Philips G8 TV receiver.
The PCB measures 210 X 150mm. The whole assembly including the screening box originated from New Zealand or Australia.
No IC's are employed so it should be an easy matter to trace out the circuit.
Till Eulenspiegel.
No need to trace that PSU out, it's a Philips K9 PSU.
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Looks just the job and you’ve a bit more space to play with than in my A823 of which I also have a SMPS planned for future. I’m not sure but I believe the HT on the G8 is around 200V as with the A823 so an extra 45V output required. I see like the Thorn 3000 it has a crowbar but on the output side. That’s going to put the chopper transistor under a lot of stress if it fires.
Can anyone tell me what year the K9 was released?
John.
Posted by: @jayceebeeCan anyone tell me what year the K9 was released?
Can't give you an exact date, but I can say I believe it was before Dec 1972. My reasoning; I have service supplements for the K9 chassis starting from Dec 1972 through to July 1983.
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The BRC 3000 was released late 1969. At that time, the switched mode power supply was considered something exotic and very complex, shrouded with mystery. Only very clever service engineers could repair the PSU, so we were told. Looking at the circuit diagram now, it's all too evident it's quite a simple unit. I do remember keeping six spare 3000 series power supply units in a repaired state for quick repairs in the customer home.
Hi Chris, thanks for identifying the Philips SM PSU and posting up the circuit diagram of the main PCB. It should be an easy task to trace out the circuit of the control module. I knew of the existence of the K9, but have no hands-on servicing experience of any of the sets fitted with the K9 chassis.
Till Eulenspiegel.
The date code on the BU126 switching transistor is: F3174.
Till Eulenpiegel.
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