PYE TT1 - First Transistor Portable UK TV - Page 3 - UK Vintage Radio Repair and Restoration Discussion Forum

mark pirate · 31st Jan 2016, 8:53 am

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

FERNSEH · 31st Jan 2016, 3:38 pm

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.

FERNSEH · 1st Feb 2016, 8:53 pm

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.

Duke_Nukem · 1st Feb 2016, 11:57 pm

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

FERNSEH · 2nd Feb 2016, 1:10 am

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.

MALC SCOTT · 2nd Feb 2016, 10:32 am

Would one of those Akura DC regs work which they used in various mains/battery colour portables? Malc.

FERNSEH · 2nd Feb 2016, 12:18 pm

Hi Malc,
the Baby 10 regulator? It's possible a spare one is out there somewhere. Certainly it would do the job.

DFWB.

AC/HL · 2nd Feb 2016, 12:29 pm

Got one here, yours for the postage if you want it.

MALC SCOTT · 2nd Feb 2016, 12:38 pm

Should have them in stock here if you need one David.

FERNSEH · 2nd Feb 2016, 6:39 pm

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.

Welsh Anorak · 5th Feb 2016, 1:00 pm

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

FERNSEH · 5th Feb 2016, 3:04 pm

Hi Glyn,
I'm assuming that the Baby 10 regulator delivers an output of 10 volts, but does it?

DFWB.

Welsh Anorak · 6th Feb 2016, 5:26 pm

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.

hamid_1 · 6th Feb 2016, 6:26 pm

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.

Freya · 6th Feb 2016, 6:49 pm

There is a KT-706 DC-DC converter available on ebay that uses the same IC with almost identical circuit.

FERNSEH · 6th Feb 2016, 7:34 pm

Link to a vendor in Taiwan: http://www.ebay.co.uk/itm/1pc-Switch...UAAMXQLw1Rzudg

DFWB.

31st Jan 2016, 8:53 am	#41
mark pirate Dekatron Join Date: Mar 2008 Location: Worthing, West Sussex, UK Posts: 5,129	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, 3:38 pm	#42
FERNSEH Dekatron Join Date: Mar 2005 Location: Gateshead, Tyne and Wear, UK. Posts: 7,014	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, 8:53 pm	#43
FERNSEH Dekatron Join Date: Mar 2005 Location: Gateshead, Tyne and Wear, UK. Posts: 7,014	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.

1st Feb 2016, 11:57 pm	#44
Duke_Nukem Octode Join Date: Jan 2003 Location: Birmingham, West Midlands, UK. Posts: 1,248	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, 1:10 am	#45
FERNSEH Dekatron Join Date: Mar 2005 Location: Gateshead, Tyne and Wear, UK. Posts: 7,014	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, 10:32 am	#46
MALC SCOTT Octode Join Date: Aug 2006 Location: Willington, County Durham, UK. Posts: 1,462	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. __________________ Malc Scott

2nd Feb 2016, 12:18 pm	#47
FERNSEH Dekatron Join Date: Mar 2005 Location: Gateshead, Tyne and Wear, UK. Posts: 7,014	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, 12:29 pm	#48
AC/HL Dekatron Join Date: Nov 2003 Location: Heckmondwike, West Yorkshire, UK. Posts: 9,432	Re: PYE TT1 - First Transistor Portable UK TV Got one here, yours for the postage if you want it. __________________ Bill, BVWS member

2nd Feb 2016, 12:38 pm	#49
MALC SCOTT Octode Join Date: Aug 2006 Location: Willington, County Durham, UK. Posts: 1,462	Re: PYE TT1 - First Transistor Portable UK TV Should have them in stock here if you need one David. __________________ Malc Scott

2nd Feb 2016, 6:39 pm	#50
FERNSEH Dekatron Join Date: Mar 2005 Location: Gateshead, Tyne and Wear, UK. Posts: 7,014	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. Attached Thumbnails

5th Feb 2016, 1:00 pm	#51
Welsh Anorak Dekatron Join Date: Apr 2005 Location: North Wales, UK. Posts: 5,952	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, 3:04 pm	#52
FERNSEH Dekatron Join Date: Mar 2005 Location: Gateshead, Tyne and Wear, UK. Posts: 7,014	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, 5:26 pm	#53
Welsh Anorak Dekatron Join Date: Apr 2005 Location: North Wales, UK. Posts: 5,952	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, 6:26 pm	#54
hamid_1 Heptode Join Date: Aug 2009 Location: High Wycombe, Bucks. UK. Posts: 605	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, 6:49 pm	#55
Freya Octode Join Date: Jan 2009 Location: Falmouth, Cornwall, UK. Posts: 1,886	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. __________________ Stephen _________"It`s only an old telly" ___

6th Feb 2016, 7:34 pm	#56
FERNSEH Dekatron Join Date: Mar 2005 Location: Gateshead, Tyne and Wear, UK. Posts: 7,014	Re: PYE TT1 - First Transistor Portable UK TV Link to a vendor in Taiwan: http://www.ebay.co.uk/itm/1pc-Switch...UAAMXQLw1Rzudg DFWB.