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Baird 492 (1962)

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Baird 492 (1962)

Post by Colourstar » Sat Aug 13, 2016 7:50 pm

I'm currently up to my eyes in home improvement work so there's not much time to play with TVs, but on a whim I took down this 1962 Baird model 492 from the 'round tuit' pile, or shelf, to be more exact.

It came from an ad on Gumtree a couple of years ago. It was found wrapped in blankets in someone's loft. I had seen a photo of this model years ago when I was in my teens but never thought I'd ever find one. Everything comes to he who waits, it would seem.

The set is well laid out for servicing: You pull off the front knobs, undo a screw and the chassis hinges out giving full access. There are three pcbs, for timebase, sound and IF. The set is covered in the 1962-3 red book. Interestingly it uses two PCL85s, one for the usual frame duties, the other for sound output. I don't know of any other set that uses this valve in that position.

Once a duff dropper section had been dealt with, the initial result was frame collapse. This rapidly reduced in width as the set warmed. Luckily this was down to a wax cap bubbling away rather than anything more sinister in the LOPT itself. Nothing would induce the frame to open up although the picture could be seen (sort of) rolling within the single line. Rather than blindly change every black Hunts cap on the timebase board I unplugged the scan coils to check for contunuity. Sure enough the frame coils read o/c. Disaster! Not quite. Looking at the coils for any broken wires I spied a thermistor. Or two halves of a thermistor to be exact. With a croc clip temporarily clamping it together I had a full scan. I've been caught by this before on a BRC 950 and have never forgotten it!

There's more to do but the results look really good. The tube is a belter and the picture really punchy. Oddly there is no user fine tuner on this set. Also I discovered it only had coils fitted for Channels 4 and 8.

All in all a nice rare set. The styling is rather 1950s, but with a 19" tube. I love the look of it. I think DavidH on here also has one of these sets, acquired from Mikey's last get together.

Steve
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Re: Baird 492 (1962)

Post by Cathovisor » Sat Aug 13, 2016 8:21 pm

That's a super picture there, Steve :aad . Mind you, I'd be terrified of that chassis encouraging the set to make a bid for the floor whilst in its service position... :aae

 
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Re: Baird 492 (1962)

Post by Focus 2 » Sat Aug 13, 2016 8:23 pm

Wow, that's looking good. I remember when we first ran it up, discovering frame collapse. Glad it was an easy fix.

Cheers
Brian

 
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Re: Baird 492 (1962)

Post by sideband » Sat Aug 13, 2016 8:30 pm

Colourstar wrote:Interestingly it uses two PCL85s, one for the usual frame duties, the other for sound output. I don't know of any other set that uses this valve in that position.


Very unusual but I suppose no worse than using a PCL82 as a frame output valve when it's normal use is sound output or (in some Pye sets) a PCL84 as sound output when it's normal use is video output.

I wonder if the PCL85 used as sound output is longer lasting than the one used as frame output?

 
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Re: Baird 492 (1962)

Post by marc » Sat Aug 13, 2016 8:33 pm

Hi Steve,

Well you've certainly scored a winner with that set, superb picture too. Great stuff ! :aad

So onto the next set and the next and the next and........ (to the sound of a whip cracking in the distance) :aaj
Well we know you've not got any CRT issues on your 'round tuit' pile :qq1

Marc.

 
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Re: Baird 492 (1962)

Post by PYE625 » Sun Aug 14, 2016 10:56 am

That is good :aad
P-l-e-n-t-y of width there lol

 
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Re: Baird 492 (1962)

Post by Colourstar » Sun Aug 14, 2016 6:53 pm

PYE625 wrote:That is good :aad
P-l-e-n-t-y of width there lol


Y-e-s, I'd noticed that. Width control at minimum too. :aaq

More to do methinks...

Steve


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