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B&W TV Marconi VT73DA

Hurty · 2025-03-24T11:25:00Z

I am going to have a bit of a clear out. So here I have a Marconi VT73DA. I was given this set about 20 years ago. I had heard of these sets from older engineers years ago and how unreliable they where, not was expected from Marconi! It's main fault at the time was an open circuit frame oscillator transformer primary. This I cleaned in isopropanol fluid which then allowed me to get to the broken winding, removing a couple of turns and re-terminating cured the fault. I went through all the wax capacitors and eventually had the set up and running. All the problems as described for this set where then evident. You can have a focused screen but no brightness or a visible picture but out of focus. The construction of this set looks like it is home made! Tags or twisted wires all over the place. If you compare it with the Bush TV12 which looks properly manufactured, as it is, there is no comparison. After doing all this work the tube was found to be as flat as a pancake, only visible in a blacked out room. So 20 years later its on the desk again. It ran up with a raster just visible and slight noise from the speaker when the volume control is moved but no actual picture and sound. This is , I think, a Birmingham set so will be on Band 1 Channel 4. Anyway a few pictures to start with and see how I get on.

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Black & White Television plus Standards converters

Last Post by irob2345 3 weeks ago

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irob2345

(@irob2345)

Posts: 780

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Re Emiscope CRTS, back in 1956 EMI Australia imported Emiscope 17" 70 degree CRTs for their first TV, the E1 - 01.

None of these tubes lasted longer than 3 months!

Luckily for EMI, AWV (a division of AWA) offered to rebuild them all.

I serviced one of these TVs a couple of years back, original AWV rebuilt CRT and all. Still a very strong CRT.

Posted : 21/04/2025 11:16 am

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