Another recent pick-up, this UK-made 1983 Sony KV-2060UB:
The case is in really nice condition. I was quite surprised that this was a 1983 set as the "ITV2" channel is something I'd expect to see on pre-1982 sets, what with Channel 4 launching in 1982.
The mains cord had been cut but that wasn't really an issue. Powered it up with a 200 watt bulb in series and this 0.22uf Rifa glaze capacitor released the magic smoke and filled the room with a quite nice toffee smell:
I don't know if someone's replaced this in the past but it's rated at 250 volts which is way too close to mains voltage for my liking.
RIFA's gotta love em! Still, after almost 40-years service, they don't really deserve their bad reputation. I recently powered up a TV and whilst fault-finding another problem there was a PHUT! followed by plumes of smoke!
Poor thing
p.s.
I had a box of over 400 NOS 0.1uF RIFA X2 caps, I binned the lot, not because of the above, but the encapsulation epoxy on every one had developed hairline cracks. I've other types of RIFA X2 with a different encapsulation and will happily fit any of those, they'll likely last another 40-years.
I was quite surprised that this was a 1983 set as the "ITV2" channel is something I'd expect to see on pre-1982 sets, what with Channel 4 launching in 1982.
I saw that on Pye sets in the 1970s. You're forgetting that especially in the analogue era it was quite possible to live at the intersection of transmitter service areas: for example, as a child we could receive Anglia and ATV at equal strength.
@cathovisor I can kinda understand the dual standard/VHF era but normally I'd expect TVs from 1982 onwards to just have 1,2,3,4,5 etc as manufacturers seemed to give up trying to put whatever name the new fourth channel was going to be.
The 1976 National Panasonic Quintrix I picked up at the same time has ITV 2 as the fourth channel, yet my 1978 Pye CT450/G11... actually, what is going on here?
A Pal of mine bought a Sony KV-260UB around 1983 and displayed an excellent picture for years.
I bought a Sony KVM-211XMT Black Trinitron 5 Years later which also displayed an excellent picture and lasted 20 Years with no repairs.
Regarding the 4th Channel Button labelled ITV2 instead of Ch4. My Mum and Dad rented an RBM/Bush TV315 Monochrome Television in the Summer of 1973 and the 3rd and 4th buttons were labelled ITA1/ITA2 instead of IBA1 removed link I wondered at the time why RBM hadn't changed the labelling from ITA to IBA as ITA became the IBA on the 12th July the previous Year.
@lyons-denntlworld-com I'm wondering if there was already a batch of facia panels made up and/or they started manufacture in 1982 for the 1983 "model year". Same with your parents' RBM.
My 1969 Rediffusion "Guildford" with a Bush A640 chassis has ITA listed as the third channel but bear in mind this is dual standard so it could pick up ITV on both 405 line VHF and 625 line UHF:
The instigation of a fourth channel was put into motion with the Broadcasting act 1980. Channel 4 was only created by a Broadcasting act in 1982 with transmissions started in November 1982.
You are probably correct that the art work was made before Channel 4 was created, so not surprising that Ch 4 logos on TV’s came later.
@cathovisor I can kinda understand the dual standard/VHF era but normally I'd expect TVs from 1982 onwards to just have 1,2,3,4,5 etc as manufacturers seemed to give up trying to put whatever name the new fourth channel was going to be.
The 1976 National Panasonic Quintrix I picked up at the same time has ITV 2 as the fourth channel, yet my 1978 Pye CT450/G11... actually, what is going on here?
Last thing first: as I pointed out earlier to you, it was long possible in the analogue 625 era to pick up signals from more than one region. Round here there are still many aerials pointing either to Waltham and Belmont or Waltham and Sandy Heath. So the G11 you picture has a choice of two BBC1 regional programmes and two ITV programmes, reflecting this fact: for a very long time BBC2 was a national channel only with no capacity for regional optouts, the sixth button not only reflecting the popularity of the VCR but also that there was no need for a second BBC2 button. At home with our (rented) G11 they were tuned to the Sandy and Waltham transmitters. People forget that before that dogmatic grocer's daughter came to power, the commercial broadcasters were all very different and produced their own distinctive programming. During the 70s there was, like the BBC of old, a certain homogenisation of programming but quite often different scheduling of the same programme as well. You seem to be making an assumption that the "ITV2" label must equal "Channel 4" when in reality it just denoted a second variant of ITV to watch.
(Trivia moment: the suffix 'C' on early dual-channel Bush TVs e.g. the TV24C, TV36C denoted the sets could receive Commercial channels.)
Labelling buttons with the actual broadcaster was seemingly peculiar to the UK: German TVs were simply labelled 1-8 e.g. my parents' SABA and I think (BICBW) Crusty's Telefunken 743 is the same, as are the Philips VCRs which are simply labelled 1-6 on their buttons.
What really killed button labels was the growth of remote control, also IIRC Teletext sets would put up a channel ident derived from the teletext signal.
RIFA's gotta love em! Still, after almost 40-years service, they don't really deserve their bad reputation. I recently powered up a TV and whilst fault-finding another problem there was a PHUT! followed by plumes of smoke!
Poor thing
p.s.
I had a box of over 400 NOS 0.1uF RIFA X2 caps, I binned the lot, not because of the above, but the encapsulation epoxy on every one had developed hairline cracks. I've other types of RIFA X2 with a different encapsulation and will happily fit any of those, they'll likely last another 40-years.
Mother-in-law's sewing machine let the magic smoke out of its RIFA: I replaced it with another. After this long, I imagine it'll outlast mother-in-law. I do have some Panasonic caps of that type now.
Well, it was later than I thought. Spotted a manufacturing date on the PCB:
The Rifa:
Now replaced:
Unfortunately it seems like it's fried something else as the channels light up but that's about it. Not even the heaters are lighting up. The fuse is ok. Time to do some tracing, I'm suspecting the rectifier or one of the surrounding diodes.
Both D604 and R620 seem to test ok in-circuit though. Hmm...
Check them out of circuit! You can never be sure with in-circuit tests....too many parallel paths in solid state circuits particularly where diodes are concerned. I'd check R619 out of circuit as well.
@sideband yup, that's my thinking. Think I've managed to damage one of the main wire wound resistors next to the bridge rectifier too. Not having much luck with this 😕
The PSU has two outputs 115V & 14V, it's a bit of an odd circuit but it's a Sony after all. Some of the terminology on the circuit I'm not sure of, Q603 ECL DET is obviously overcurrent protection but what does "Stopper" refer to on those diodes? You obviously have 115V but was there any 14V supply at TP92?
@jayceebee I uploaded the full service manual for Wayne, It's still sitting in the temp download area of the Technical Library if you want to get a better understanding of the circuit.
@crustytv Thanks Chris, I already downloaded it earlier and I've seen the full circuit. As to the three stopper diodes, am I looking with my eyes shut but I cannot find a D605?
Couldn't find it on the board layout either but mentioned as Stopper 1 type 1SS119 on the circuit. Oh well, at least I don't have to go to Specsavers yet 😀 .
