UK Vintage Radio Repair and Restoration Powered By Google Custom Search Vintage Radio and TV Service Data

Go Back   UK Vintage Radio Repair and Restoration Discussion Forum > Specific Vintage Equipment > Vintage Television and Video

Notices

Vintage Television and Video Vintage television and video equipment, programmes, VCRs etc.

Reply
 
Thread Tools
Old 2nd Apr 2019, 4:26 pm   #141
Nuvistor
Dekatron
 
Nuvistor's Avatar
 
Join Date: Aug 2013
Location: Wigan, Greater Manchester, UK.
Posts: 9,424
Default Re: Baird T5 restoration project.

Play safe David, be a disaster if any worms remain and start on all that great woodwork you have done.
__________________
Frank
Nuvistor is offline   Reply With Quote
Old 2nd Apr 2019, 5:18 pm   #142
FERNSEH
Dekatron
 
FERNSEH's Avatar
 
Join Date: Mar 2005
Location: Gateshead, Tyne and Wear, UK.
Posts: 7,444
Default Re: Baird T5 restoration project.

Hi Frank,
That's right we know from past experience that those worms can re-emerge long after a state of dormancy.

Fit the new panel. It's identical to the original.

https://www.wisepropertycare.com/ser...tle/lifecycle/

DFWB.
FERNSEH is offline   Reply With Quote
Old 2nd Apr 2019, 5:50 pm   #143
peter_scott
Dekatron
 
peter_scott's Avatar
 
Join Date: May 2003
Location: Edinburgh, UK.
Posts: 3,273
Default Re: Baird T5 restoration project.

Play safe but retain the reconstruction with the set.

Peter
peter_scott is offline   Reply With Quote
Old 2nd Apr 2019, 8:28 pm   #144
FERNSEH
Dekatron
 
FERNSEH's Avatar
 
Join Date: Mar 2005
Location: Gateshead, Tyne and Wear, UK.
Posts: 7,444
Default Re: Baird T5 restoration project.

"Play safe but retain the reconstruction with the set."

Hi Peter, All the new parts made for the T5 are directly interchangeable with original pre-war parts.

DFWB.
FERNSEH is offline   Reply With Quote
Old 2nd Apr 2019, 8:55 pm   #145
line sync
Heptode
 
Join Date: Sep 2009
Location: Kinver, Staffordshire, UK.
Posts: 628
Default Re: Baird T5 restoration project.

Play safe david and fit your newly made one.
You never know there could be some hibernating in the original board.

Robin
line sync is offline   Reply With Quote
Old 3rd Apr 2019, 8:54 am   #146
beery
Heptode
 
beery's Avatar
 
Join Date: Jun 2006
Location: Ware, Hertfordshire, UK.
Posts: 988
Default Re: Baird T5 restoration project.

Hi David,
I agree with others, do fit the replacement part.

Quote:
Originally Posted by FERNSEH View Post
Hi Frank,
That's right we know from past experience that those worms can re-emerge long after a state of dormancy.
DFWB.
I seem to be reminded of an Ekco from the past...


Cheers
Andy
beery is offline   Reply With Quote
Old 3rd Apr 2019, 9:11 am   #147
Freya
Octode
 
Freya's Avatar
 
Join Date: Jan 2009
Location: Falmouth, Cornwall, UK.
Posts: 1,981
Default Re: Baird T5 restoration project.

With all the work so far, it would be a shame to see it attacked again. Will you spray with preventative treatment prior to the veneering ?
__________________
Stephen
_________"It`s only an old telly" ___
Freya is offline   Reply With Quote
Old 3rd Apr 2019, 10:27 am   #148
FERNSEH
Dekatron
 
FERNSEH's Avatar
 
Join Date: Mar 2005
Location: Gateshead, Tyne and Wear, UK.
Posts: 7,444
Default Re: Baird T5 restoration project.

Quote:
Originally Posted by Freya View Post
With all the work so far, it would be a shame to see it attacked again. Will you spray with preventative treatment prior to the veneering ?
Hi Steven,
I believe modern plywood uses non animal sourced glues to bond the laminar sheets together and is less liable to woodworm invasion, but nevertheless it will be a good idea to protect the newly constructed cabinet from any future woodworm problems.

Rest assured the new CRT support panel will be fitted in lieu of the original part.

DFWB.
FERNSEH is offline   Reply With Quote
Old 3rd Apr 2019, 11:46 am   #149
mark pirate
Dekatron
 
mark pirate's Avatar
 
Join Date: Mar 2008
Location: Worthing, West Sussex, UK
Posts: 5,185
Default Re: Baird T5 restoration project.

Quote:
Rest assured the new CRT support panel will be fitted in lieu of the original part.
Very glad to hear that David, I have had a set ruined by woodworm while in storage, it appears to have spread from the shelf unit it was stored on.
Both the cabinet base & shelf had to be burnt.

Thankfully it was in my (concrete) garage, rather than my house!
Looking forward to seeing the results of the veneering, keep up the good work.

Mark
mark pirate is offline   Reply With Quote
Old 3rd Apr 2019, 12:41 pm   #150
Argus25
No Longer a Member
 
Join Date: Oct 2016
Location: Maroochydore, Queensland, Australia.
Posts: 2,679
Default Re: Baird T5 restoration project.

Quote:
Originally Posted by FERNSEH View Post
The vision IF is 13mc/s, much higher than I thought it would have been.
Much more work needs to be done on the vision receiver but the results so far are very encouraging.
Looking at the signal on the video output valve it shows a limited HF response, as seen by the rounded corners on the sync pulses. It could be the capacitance of the scope probe on a high Z part of the circuit, making that look worse than it really is.

Regarding the "worm" do you know what sort of species it is ?

Many Bora beetles are insects, if they are, their chitinous exoskeletons dissolve in hydrocarbon solvents.

So, you can dissolve their bodies (melt them like the wicked Witch in the Wizard of Oz) simply by soaking/painting the timber with Terpentine. Also, there is the opportunity to paint and soak the timber panels with insecticide (not the inept green environmentally friendly type that is hopeless and doesn't work, but the real toxic deal).

If there are any residual wood destroying life forms there which could include insects or fungi, you should be able to exterminate them completely. Also , another option is to slowly raise the temperature of the wood to a value that is incompatible with life, around 125-135 deg C over 1/2 hr would do it without too much damage to the timber.
Argus25 is offline   Reply With Quote
Old 3rd Apr 2019, 3:36 pm   #151
beltinge bore
Pentode
 
Join Date: Dec 2012
Location: Herne Bay, Kent, UK.
Posts: 233
Default Re: Baird T5 restoration project.

Hello David

I think I might know which EKCO young Beery is referring to! It sits in my garage having had much new wood and plenty of woodworm treatment.

For some reason SHMBO won't let it in the house.

Regards Steve.
beltinge bore is offline   Reply With Quote
Old 15th Apr 2019, 3:59 pm   #152
FERNSEH
Dekatron
 
FERNSEH's Avatar
 
Join Date: Mar 2005
Location: Gateshead, Tyne and Wear, UK.
Posts: 7,444
Default Re: Baird T5 restoration project.

Time to apply wood dye on the side panels, but before any attempt to do this I'll test the various dyes and polishes on wood off-cuts. The attached picture shows that the finish needs to darkened in order to resemble the wood surfaces of the original panels.

DFWB.
Attached Thumbnails
Click image for larger version

Name:	BairdT5_Televisior_57.jpg
Views:	341
Size:	62.7 KB
ID:	181390  
FERNSEH is offline   Reply With Quote
Old 15th Apr 2019, 4:07 pm   #153
FERNSEH
Dekatron
 
FERNSEH's Avatar
 
Join Date: Mar 2005
Location: Gateshead, Tyne and Wear, UK.
Posts: 7,444
Default Re: Baird T5 restoration project.

After several applications of wood dye on the test piece I'm sure the side panels can be stained and polished.
But the wood dye should be applied outdoors and not in the workshop, nasty fumes given off during the application process.
As the attached picture shows the panel surface colour is still too light and needs more wood dye in order that it resembles the original dark finish.

DFWB.
Attached Thumbnails
Click image for larger version

Name:	BairdT5_Televisior_58.jpg
Views:	346
Size:	37.9 KB
ID:	181391  
FERNSEH is offline   Reply With Quote
Old 3rd May 2019, 9:59 pm   #154
FERNSEH
Dekatron
 
FERNSEH's Avatar
 
Join Date: Mar 2005
Location: Gateshead, Tyne and Wear, UK.
Posts: 7,444
Default Re: Baird T5 restoration project.

It has been established that the two power supply units and the sound and vision receivers are serviceable. The loudspeaker is OK, it just needs the frame repainting. Now the timebase unit must receive attention. In order that it can be tested my Baird T23 will need to be repaired. Another scary job because the CRT must be removed to fix that intermittent connection on the tube base.

Pictures of the T5 timebase unit. This is the early version without the interlace diode.

DFWB.
Attached Thumbnails
Click image for larger version

Name:	BairdT5Timebase_2.jpg
Views:	332
Size:	108.5 KB
ID:	182402   Click image for larger version

Name:	BairdT5Timebase_3.jpg
Views:	350
Size:	151.8 KB
ID:	182403   Click image for larger version

Name:	BairdT5Timebase_4.jpg
Views:	340
Size:	121.7 KB
ID:	182404  
FERNSEH is offline   Reply With Quote
Old 4th May 2019, 8:43 am   #155
peter_scott
Dekatron
 
peter_scott's Avatar
 
Join Date: May 2003
Location: Edinburgh, UK.
Posts: 3,273
Default Re: Baird T5 restoration project.

In the third photo there are three pots sitting on angled metalwork. What do they control and how do you access them for adjustment. They don't appear to be shown on the drawing below and there appears to be just a couple of blanking plugs corresponding with that location on the front panel.

Peter
Attached Thumbnails
Click image for larger version

Name:	T5 front controls.jpg
Views:	276
Size:	63.7 KB
ID:	182418   Click image for larger version

Name:	575lot448_5 (Custom).jpg
Views:	290
Size:	41.1 KB
ID:	182419  
peter_scott is offline   Reply With Quote
Old 4th May 2019, 11:31 am   #156
FERNSEH
Dekatron
 
FERNSEH's Avatar
 
Join Date: Mar 2005
Location: Gateshead, Tyne and Wear, UK.
Posts: 7,444
Default Re: Baird T5 restoration project.

Hi Peter,
Those controls are presets for the line and frame timebase frequencies and picture height adjustment.
It's possible that very early production timebase units would have a 240/405 switch and that's the reason for those blanking plugs on the control panel.
The first attachment shows the control panel of the Baird T5. The circuit diagram is of the frame timebase in the T23. A Mazda AC/HL is used as the interlace diode.

DFWB.
Attached Thumbnails
Click image for larger version

Name:	215558[1].jpg
Views:	286
Size:	71.8 KB
ID:	182436   Click image for larger version

Name:	DSC_0197_7.jpg
Views:	261
Size:	84.6 KB
ID:	182437  

Last edited by FERNSEH; 4th May 2019 at 11:39 am.
FERNSEH is offline   Reply With Quote
Old 4th May 2019, 12:36 pm   #157
peter_scott
Dekatron
 
peter_scott's Avatar
 
Join Date: May 2003
Location: Edinburgh, UK.
Posts: 3,273
Default Re: Baird T5 restoration project.

Thanks David. Do you just push finger and thumb up inside the access to adjust them? Do you think this set has had the 240 line circuitry?

Peter.
peter_scott is offline   Reply With Quote
Old 4th May 2019, 1:00 pm   #158
FERNSEH
Dekatron
 
FERNSEH's Avatar
 
Join Date: Mar 2005
Location: Gateshead, Tyne and Wear, UK.
Posts: 7,444
Default Re: Baird T5 restoration project.

Hi Peter,
In my Baird T23 timebase chassis there is evidence of wiring that might well have been used for the 240/25 and 405/50 systems switching, although the wires definitely haven't been connected to anything. Something similar can be seen in the timebases of first generation EMI sets where the dual standard cableforms were still fitted in later 405 only receivers. In very early T5 models the preset controls would have been used to permit easy switching between the two transmission standards.
The preset controls are only accessible when the back cover is removed.

DFWB.
FERNSEH is offline   Reply With Quote
Old 13th May 2019, 10:44 pm   #159
FERNSEH
Dekatron
 
FERNSEH's Avatar
 
Join Date: Mar 2005
Location: Gateshead, Tyne and Wear, UK.
Posts: 7,444
Default Re: Baird T5 restoration project.

The mirror lid escaped the attention of the woodworms and can be refurbished. It doesn't look all that pretty for sure but there is no doubt it can be saved.
A few pieces of veneer will have to be inserted to correct slight damage. The surface silvered mirror is in excellent condition.
A new laminated safety glass has been made. The original had become delaminated and was discoloured anyway.

The line output transformer has open circuit windings and that's holding up the timebase restoration.

DFWB.
Attached Thumbnails
Click image for larger version

Name:	BairdT5_Televisior_57.jpg
Views:	282
Size:	91.7 KB
ID:	183046  
FERNSEH is offline   Reply With Quote
Old 14th May 2019, 7:26 am   #160
beery
Heptode
 
beery's Avatar
 
Join Date: Jun 2006
Location: Ware, Hertfordshire, UK.
Posts: 988
Default Re: Baird T5 restoration project.

Hi Fernseh,
the one I restored which had electrolytics dated September 36 had tell tale shaddows of where the extra parts had been. Unfortunately the circuit diagrams I have, have had the dual standard parts deleted. Note that there was no extra valve like in the EMI sets.

I would be interested in the winding details of the lopt as it might give me some clues for the one I need to make for the Garrick which uses very similar timebases.

Cheers
Andy
beery is offline   Reply With Quote
Reply

Thread Tools



All times are GMT +1. The time now is 7:54 am.


All information and advice on this forum is subject to the WARNING AND DISCLAIMER located at https://www.vintage-radio.net/rules.html.
Failure to heed this warning may result in death or serious injury to yourself and/or others.


Powered by vBulletin®
Copyright ©2000 - 2024, vBulletin Solutions, Inc.
Copyright ©2002 - 2023, Paul Stenning.