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Baird M708 Dual Standard Colour Television

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The_Teleman
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Wow what a cracking set! & I thought my GEC 2030 was a bargain 

it just goes to show being in the right place at the right time really does help 

I will be looking forward to the restoration 

i have only ever seen one other 19 inch version & that is at Chris's house

well done Andrew

chris

 
Posted : 10/12/2017 3:40 pm
PYE625
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Thanks Chris, I keep admiring your GEC2030....It's a beauty. 

It really was a pure chance and fate stepped in with the Baird. I had no plans to obtain any more TV set's, certainly not for the immediate future anyway. But how could I let this opportunity slip away?  To be honest, I  was expecting the bids to sky-rocket and was only prepared to go up to £50.

I'm working on the Decca DR303 at the moment, but hope to have the Baird chassis on the bench over Christmas. I have to admit to being slightly nervous as by all accounts these set's are rare, but not only that, parts are also difficult to come by. For instance, the mains input/aerial panel needs replacing as some muppet drilled it out to accept the wrong type of socket. (See below on the left). I'm probably being very silly concerning myself with this as there is a mountain to climb with the rest of the set first.

IMG 3511 50

To understand the black art of electronics is to understand witchcraft. Andrew.

 
Posted : 10/12/2017 3:56 pm
Katie Bush
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Posted by: Cathovisor
Posted by: PYE625
Posted by: Cathovisor

Sad to think the Murphy could be dumped, but that's the way of things 🙁 I can't really give it a home either, especially as I might soon be taking ownership of not one, but two pre-war radiograms.

I looked over the Murphy and it was in a large cabinet, bigger than the Baird. The condition was not great with large bit's missing from the back cover too. I had to say no sadly.

Out of curiosity, was it the 17" or 21" version?

Fear not, the Murphy is saved!

£24 and a few coppers to buy it, but it's now mine, so, Mike, if you will, I'll gladly accept your offer to collect it for me. it's all bought and paid for, the guy knows it won't be me collecting it, and he knows your name is Mike, so we're good to go, as it were.

Oh, and I forgot to ask the screen size..... Oh well!

 
Posted : 11/12/2017 4:31 pm
PYE625
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Good news Marion !!  🙂

You know I couldn't swear the screen size now, but think it's a 17. So going on that, it will probably be a 21 inch.

To understand the black art of electronics is to understand witchcraft. Andrew.

 
Posted : 11/12/2017 4:36 pm
Marc
 Marc
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Posted by: PYE625

think it's a 17. So going on that, it will probably be a 21 inch.

Aha ! someone else who uses my method  🙂

Marc
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RSGB call sign 2E0VTN

 
Posted : 11/12/2017 4:53 pm
Katie Bush
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And do you know what? I can't find anything on the web. Even Jon'z "valvepage" website has a reference and a photo of a V430D, but nothing on the screen size, however, another variant (V430) table model was sold earlier this year, and looks likely to have been a 17" model.

I assume this one, the 430D has tambour doors, or at least the one on Jon's site appears to have.

 
Posted : 11/12/2017 5:00 pm
crustytv
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Yes it is the 430 series chassis.

A 17" V430D released in August 1959 and has F.M. radio.  Sold at a price tag of £72 os 5d. Although it looks to have gone up in price by the sales leaflet below.

I have the trader data for it.

V430D

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Posted : 11/12/2017 5:11 pm
Katie Bush
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Excellent!

I wondered about the FM radio, and something in the back of my mind said it was so equipped.

This could come down to a face off - Bush Vs Murphy. I have more Bushes, but the Murphys are on the ascent!

 
Posted : 11/12/2017 5:27 pm
crustytv
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This next statement will probably have Mike getting in his car to come and hang me from the nearest post. The Bush's won't stand a cat in hells chance of matching the Murphy for picture quality. Murphy were so confident with these range of sets they didn't include fine tuning. I remember being awestruck by my V410 nothing came close to it.

Anyway must stop taking Andrews thread off-topic.

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Posted : 11/12/2017 5:32 pm
Till Eulenspiegel
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Murphy Radio Ltd. didn't do any short cuts with those TVs equipped with FM radio.   Whereas most TVs with FM used the standard BREMA sound IF, Murphy did things differently.

Switched to FM radio the standard 38-15Mc/s sound IF issuing from the tuner is down converted  to a non standard 6.31Mc/s, this frequency was chosen to avoid image interference problems.   Having an FM demodulator permitted the refinement of AFC to keep the chosen station in tune.

Till Eulenspiegel. 

 
Posted : 11/12/2017 6:09 pm
Terrykc
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Posted by: Chris

Yes it is the 430 series chassis.

A 17" V430D released in August 1959 and has F.M. radio.  Sold at a price tag of £72 os 5d. Although it looks to have gone up in price by the sales leaflet below.

 

Chris, I think you might find that it is really £75 0s 5d + £21 11s 7d Purchase Tax.

When all else fails, read the instructions

 
Posted : 11/12/2017 6:34 pm
PYE625
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Posted by: Chris

Anyway must stop taking Andrews thread off-topic.

Lol, I don't mind...variety is the spice of. Happy if you want to split it off though.

To understand the black art of electronics is to understand witchcraft. Andrew.

 
Posted : 11/12/2017 6:46 pm
Terrykc
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Andrew, how do you plan to work on it?

We sold these Baird sets and, whilst is was OK to sprawl out on the customer's fitted carpet to fix these sets, I worked mostly in the workshop and the idea of spreading myself out on the bare floorboards didn't appeal!

Our benches were quite deep but the castors were free running and the first time we lifted one up we realised that there were two dangers: either it would run forward off the bench(!) or, while working on it, the cabinet would collide with the edge of the shelf over the bench and that wouldn't do it much good either!

By chance, someone found an old wooden table somewhere that was just slightly bigger than the 25" cabinet.

We borrowed a drill and hole saw from the electricians and drilled four 3" holes in the top so that the castors would drop through and provide a suitable working position at just the right height to suit my bench stool!

When the 19" models turned up, another two holes meant that either type could be accommodated.

Possibly a sheet of chipboard on a plinth about 3" deep with suitable holes in it could make it much easier to work on the set on your bench?

When all else fails, read the instructions

 
Posted : 11/12/2017 6:49 pm
Cathovisor
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Posted by: Chris

This next statement will probably have Mike getting in his car to come and hang me from the nearest post. The Bush's won't stand a cat in hells chance of matching the Murphy for picture quality.

No problem- we have ways of dealing with you via cyberspace... 😎

Murphy were so confident with these range of sets they didn't include fine tuning.

That's because they had AFC... 😉

 
Posted : 11/12/2017 7:02 pm
PYE625
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Thanks Terry, that sounds a good idea. The globe castors are pretty much seized up anyway, so it won't move much at the moment. My plan is to remove the chassis and have that upon the bench for a good visual inspection and then take it from there. Many cold checks will follow before any mains of course, and reference to Chris's excellent thread on his M718 will be made too. It is interesting to note that Chris discovered the R&TV Servicing data does not necessarily comply with the 710 chassis.

To understand the black art of electronics is to understand witchcraft. Andrew.

 
Posted : 11/12/2017 7:03 pm
Terrykc
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Posted by: PYE625

It is apparent that the power and aerial input panel has been "modified" and the correct mains socket is long gone.

Andrew, my memory of these sets is that they didn't have a mains socket at all, just a captive mains lead. Certainly not that Bulgin connector that your set is fitted with!

No doubt Chris can confirm/deny that my memory is correct.

When all else fails, read the instructions

 
Posted : 12/12/2017 1:21 pm
crustytv
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Posted By: Terry

No doubt Chris can confirm/deny that my memory is correct.

All the 700 series and 710 did have a two pin socket. Its very much like the Bush TV22 type connection but the plug would have had a deep groove in the body on one side to align with the socket shape. This is to ensure correct polarity was always observed.

No idea why someone would replace the old socket for the large round one unless the original lead with correct plug had been lost, in which case a captive lead would have been better.

The lead an plugs were both missing on my M702 and M718 so I trimmed the socket to remove the groove so I could use a DAC90A/TV22 plug. Just have to remember to get it the right way so as to not have a live chassis. I've marked the socket and plug, I suppose I should really fit a captive lead and disconnect the socket.

sock

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Posted : 12/12/2017 2:09 pm
PYE625
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The chassis is removed and makes it to the bench.... 

IMG 3557 50
IMG 3558 50
IMG 3559 50
IMG 3560 50

The mains transformer does not look good....if it's dead, it's game over.

IMG 3569 50

One way to fix a resistor I guess lol...

IMG 3572 50

Neither does this cap look good, and the boost HT cap has seen better days too....

IMG 3562 50
IMG 3565 50

To understand the black art of electronics is to understand witchcraft. Andrew.

 
Posted : 12/12/2017 9:25 pm
Nuvistor
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The Line output valve with the green band, I had forgotten about those, as it made in Japan written on it, something in the back of my mind.

Frank

 
Posted : 12/12/2017 9:39 pm
PYE625
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Here is the one and only IC, and an interesting discovery in the bottom of the cabinet. It looks like a fragment of a screen surround that could have been left over from a previous replacement, so the surround on it now may not be the original colour.

IMG 3578 50
IMG 3577 50
IMG 3576 50

To understand the black art of electronics is to understand witchcraft. Andrew.

 
Posted : 12/12/2017 9:46 pm
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