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Vintage Television and Video Vintage television and video equipment, programmes, VCRs etc. |
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31st Jan 2016, 9:53 am | #41 |
Dekatron
Join Date: Mar 2008
Location: Worthing, West Sussex, UK
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Re: PYE TT1 - First Transistor Portable UK TV
That looks a whole lot better, I take it you have replaced those dodgy preset pots?
I noticed the latches on the front, I take it the set has a removable lid over the CRT? Mark |
31st Jan 2016, 4:38 pm | #42 |
Dekatron
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Location: Gateshead, Tyne and Wear, UK.
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Re: PYE TT1 - First Transistor Portable UK TV
Hi Mark,
I don't think the latches are used to fit an additional filter window. It's more likely a protection panel was supplied with the set to prevent damage to the moulded Perspex CRT safety shield. The replacement frame linearity controls have solved the picture geometry faults. Interesting to note that the circuit of the frame timebase output stage in the TT1 is very similar to the frame OP stage in the BRC 3000 series CTV. DFWB. |
1st Feb 2016, 9:53 pm | #43 |
Dekatron
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Location: Gateshead, Tyne and Wear, UK.
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Re: PYE TT1 - First Transistor Portable UK TV
The final stage of the restoration of this interesting receiver will be the provision of a 10.8 volt supply regulator. I have three choices: first, use nine series connected 1.2V 2.5A/hr NiCad cells. The cells can be installed into a box to replicate the original battery pack. The cells function as the voltage regulator when the set is operated on mains and car battery. Second, the all germanium transistor series regulator employing an AD149 transistor. The third option is a modern low dropout device like the LT1033.
DFWB. |
2nd Feb 2016, 12:57 am | #44 |
Octode
Join Date: Jan 2003
Location: Birmingham, West Midlands, UK.
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Re: PYE TT1 - First Transistor Portable UK TV
Am I right in thinking that only option #1 allows running from its own internal batteries ? If so then that'd be my choice.
TTFN, Jon |
2nd Feb 2016, 2:10 am | #45 |
Dekatron
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Re: PYE TT1 - First Transistor Portable UK TV
Hi Jon,
I'm also keen on the first option. 1.2volt 2500mA/H Sanyo NiCad cells are available from Conrad: http://www.conrad-electronic.co.uk/c...omSuggest=true Or from the same firm: NiMh 1.2volt 2400mA/H cells: http://www.conrad-electronic.co.uk/c...=detview1&rb=1 DFWB. |
2nd Feb 2016, 11:32 am | #46 |
Octode
Join Date: Aug 2006
Location: Willington, County Durham, UK.
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Re: PYE TT1 - First Transistor Portable UK TV
Would one of those Akura DC regs work which they used in various mains/battery colour portables? Malc.
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Malc Scott |
2nd Feb 2016, 1:18 pm | #47 |
Dekatron
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Re: PYE TT1 - First Transistor Portable UK TV
Hi Malc,
the Baby 10 regulator? It's possible a spare one is out there somewhere. Certainly it would do the job. DFWB. |
2nd Feb 2016, 1:29 pm | #48 |
Dekatron
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Re: PYE TT1 - First Transistor Portable UK TV
Got one here, yours for the postage if you want it.
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2nd Feb 2016, 1:38 pm | #49 |
Octode
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Re: PYE TT1 - First Transistor Portable UK TV
Should have them in stock here if you need one David.
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Malc Scott |
2nd Feb 2016, 7:39 pm | #50 |
Dekatron
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Re: PYE TT1 - First Transistor Portable UK TV
Hi Bill, Hi Malc,
The TT1 was bought way back in 2005 at the Birmingham NEC. I was rather surprised the lack of interest in the set. Then Akura Baby 10 regulator module was considered at the time as a substitute for the NiCad battery. The idea was to use the set exclusively on the mains, but portability is what this set is all about so I'm still considering the battery option. The Akura regulator could still be incorporated into the circuit. It's a much better option than relying on the batteries doing the 10 volt supply regulation. The Akura 10 volt regulator was still available in 2005. Hi John, presenting the Pye TT1 alongside the famous Masteradio. DFWB. |
5th Feb 2016, 2:00 pm | #51 |
Dekatron
Join Date: Apr 2005
Location: North Wales, UK.
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Re: PYE TT1 - First Transistor Portable UK TV
Hi there
The Baby 10 regulator was available in 2005, but the original potted version had been replaced by third party discrete component units using, typically, an IC and a small transformer on similar metalwork. Some of these worked well and some didn't. The advantage of one of these is that you could open it up and experiment. Glyn |
5th Feb 2016, 4:04 pm | #52 |
Dekatron
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Re: PYE TT1 - First Transistor Portable UK TV
Hi Glyn,
I'm assuming that the Baby 10 regulator delivers an output of 10 volts, but does it? DFWB. |
6th Feb 2016, 6:26 pm | #53 |
Dekatron
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Re: PYE TT1 - First Transistor Portable UK TV
Good question. I don't think it did - I seem to remember it would give a stable output of around 11.6v and would do so with an input very close to that. Some of the alternatives wouldn't do that and would switch off if the battery voltage fell below 12v.
Goodness knows what was in the original three-pin block! Baby 10, of course, refers to the screen size. |
6th Feb 2016, 7:26 pm | #54 |
Heptode
Join Date: Aug 2009
Location: High Wycombe, Bucks. UK.
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Re: PYE TT1 - First Transistor Portable UK TV
There was an article in Televison magazine May 1996 about the Nikkai Baby 10 colour TV regulator and how to build an equivalent using only a few components.
Download a scan of the article here: http://www.digifixltd.co.uk/pdf/NikkaiBaby10Switch.pdf Since that article is now nearly 20 years old, I don't know if all the parts are still available to build it, but if they are, it should be easy. The Baby 10 regulator gives an output of 10.9v which should be OK for your Pye TT1. |
6th Feb 2016, 7:49 pm | #55 |
Octode
Join Date: Jan 2009
Location: Falmouth, Cornwall, UK.
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Re: PYE TT1 - First Transistor Portable UK TV
There is a KT-706 DC-DC converter available on ebay that uses the same IC with almost identical circuit.
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Stephen _________"It`s only an old telly" ___ |
6th Feb 2016, 8:34 pm | #56 |
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Re: PYE TT1 - First Transistor Portable UK TV
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