14th Mar 2021, 4:47 pm | #261 | |
Hexode
Join Date: Sep 2019
Location: Crystal Palace, Bromley, London, UK.
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Re: My first telly TV22
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14th Mar 2021, 6:49 pm | #262 |
Pentode
Join Date: Jan 2021
Location: York, North Yorkshire, UK
Posts: 155
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Re: My first telly TV22
I’ve just connected a raspberry pi via composite video to the hedgehog and played a video clip. Getting quite a lot of buzzing on the sound , seems less when the video is on full screen mode. Not sure if it’s vision on sound , but if I unplug the audio inputs to the hedgehog it does reduce which tends to suggest it might be coming from the rasp pi
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14th Mar 2021, 8:33 pm | #263 |
Octode
Join Date: Jan 2009
Location: Falmouth, Cornwall, UK.
Posts: 1,987
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Re: My first telly TV22
If your powering the Pi from a switch mode power supply it could be filtering through.
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Stephen _________"It`s only an old telly" ___ |
15th Mar 2021, 9:29 am | #264 |
Pentode
Join Date: Jan 2021
Location: York, North Yorkshire, UK
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Re: My first telly TV22
Thanks Freya It’s powers from a raspberry pi wall wart which I assume will be a smps will try with a dvd
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19th Mar 2021, 8:53 pm | #265 |
Pentode
Join Date: Jan 2021
Location: York, North Yorkshire, UK
Posts: 155
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Re: My first telly TV22
I got a 240 pf mica 1000v cap. Ended up buying from the US as the Usual UK suppliers were asking ridiculous postage for a £2 component of only selling in lots of 100.
Anyway I recon it’s added a couple of cm to the width , could do with a bit more but probably ok Might have another go at waking up my nos PL81 see if that helps Is there likely to be any issues waking it up in circuit - ie if the line output doesn’t start up properly? |
19th Mar 2021, 8:55 pm | #266 |
Pentode
Join Date: Jan 2021
Location: York, North Yorkshire, UK
Posts: 155
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Re: My first telly TV22
Also got an HDMI to composite converter which should give a few options for sources
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19th Mar 2021, 9:55 pm | #267 | |
Hexode
Join Date: Sep 2019
Location: Crystal Palace, Bromley, London, UK.
Posts: 417
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Re: My first telly TV22
Quote:
I'm glad you managed to increase the width with the new cap. In my case, 240pF would have been too much, but this of course depends on the actual capacitance of a particular rewind. Have you tried to play videos from sources other than your raspberry pi with the noisy ps? I'm still curious about how it handles actual content as the scene brightness changes. |
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19th Mar 2021, 9:58 pm | #268 | |
Hexode
Join Date: Sep 2019
Location: Crystal Palace, Bromley, London, UK.
Posts: 417
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Re: My first telly TV22
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20th Mar 2021, 10:44 am | #269 |
Pentode
Join Date: Jan 2021
Location: York, North Yorkshire, UK
Posts: 155
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Re: My first telly TV22
Tried adjusting c28 it had a very small effect. I put back in the nos PL81 , this time it’s fired up but width is even lower and not a very bright picture with a lot of size change when brightness is adjusted. I’m leaving it switched on for a while to see if The new valve wakes up a bit more
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20th Mar 2021, 10:45 am | #270 |
Pentode
Join Date: Jan 2021
Location: York, North Yorkshire, UK
Posts: 155
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Re: My first telly TV22
What does the trimmer cap on the deflection coil adjust?
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20th Mar 2021, 11:08 am | #271 |
Pentode
Join Date: Jan 2021
Location: York, North Yorkshire, UK
Posts: 155
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Re: My first telly TV22
New valve has woken up nicely and I recon I’m back to where it was before the Lopt rewind
Pic 1 before Pic2 after |
20th Mar 2021, 11:25 am | #272 |
Hexode
Join Date: Sep 2019
Location: Crystal Palace, Bromley, London, UK.
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Re: My first telly TV22
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20th Mar 2021, 11:39 am | #273 |
Hexode
Join Date: Sep 2019
Location: Crystal Palace, Bromley, London, UK.
Posts: 417
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Re: My first telly TV22
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20th Mar 2021, 1:47 pm | #274 |
Pentode
Join Date: Jan 2021
Location: York, North Yorkshire, UK
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Re: My first telly TV22
I have hooked a fire stick via HDMI to composite converter to the hedgehog and it seems to work ok. Get a bit of interference from the WiFi but nothing too bad. Picture seems stable enough to me . I have taken a video and will post on YouTube later.
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20th Mar 2021, 1:50 pm | #275 |
Pentode
Join Date: Jan 2021
Location: York, North Yorkshire, UK
Posts: 155
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Re: My first telly TV22
I never replaced the mains filter cap which might be why I’m getting a bit of breakthrough as I’m using a power line WiFi extender to get a signal to my garage
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20th Mar 2021, 5:41 pm | #276 |
Pentode
Join Date: Jan 2021
Location: York, North Yorkshire, UK
Posts: 155
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Re: My first telly TV22
I have uploaded a video to youtube of the set working with some real content
link below https://youtu.be/2RSYF-1usEA |
20th Mar 2021, 6:41 pm | #277 | |
Hexode
Join Date: Sep 2019
Location: Crystal Palace, Bromley, London, UK.
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Re: My first telly TV22
Quote:
Looks great, with perhaps some sound on vision. You can try to minimise this by adjusting/slightly detuning the oscillator coil (L5, I think). I don't know what the possible wifi interference (via mains) would look like though. Are you getting good interlacing? From the image there seems to be at least some line pairing, which is normal in the TV22 anyway. Helder |
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20th Mar 2021, 6:45 pm | #278 | |
Hexode
Join Date: Sep 2019
Location: Crystal Palace, Bromley, London, UK.
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Re: My first telly TV22
Quote:
Helder |
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20th Mar 2021, 6:53 pm | #279 | |
Hexode
Join Date: Sep 2019
Location: Crystal Palace, Bromley, London, UK.
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Re: My first telly TV22
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20th Mar 2021, 7:11 pm | #280 |
Pentode
Join Date: Jan 2021
Location: York, North Yorkshire, UK
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Re: My first telly TV22
Hi Helder
I'm pretty sure the glitching/noise is coming from the wifi range extender - its one that uses the mains wiring in the house to transmit the wifi signal - and I can see that the noise correlates to the network traffic light flashing on the range extender, I suppose it adds a bit of realism as though the signal was coming off air. Its quite interesting to watch the same You tube clip on the computer/modern tv v the old 405 line set - the 405 seems sharper to me somehow. |