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Old 20th Oct 2014, 10:32 am   #41
Nickthedentist
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Default Re: Murphy 12" V180C console 1950

I like your EHT meter, John. Did you construct it yourself?

Nick.
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Old 20th Oct 2014, 1:32 pm   #42
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Default Re: Murphy 12" V180C console 1950

Yes Nick. Built it back in the late 60's from a PT design I believe. John.
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Old 20th Oct 2014, 5:23 pm   #43
mark pirate
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Default Re: Murphy 12" V180C console 1950

Shame about the LOPT breaking down, but at least it can be rewound. The Ekco LOPT does work well though, and with no focus drift!

Mark
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Old 20th Oct 2014, 5:38 pm   #44
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Default Re: Murphy 12" V180C console 1950

I think the windings are almost identical Mark. The line output valve in the Ekco [6P28] is the same as early versions of the 180 and the scan coils are low impedance [15ohm]. These early flyback systems are basically the standard output transformer used with receivers employing mains EHT, plus an overwind and maybe a heater winding for the rectifier. I will get it rewound as it would be a pity to modify the Murphy in such an important area. I'll give it a good soak tonight. John.
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Old 21st Oct 2014, 12:39 pm   #45
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Default Re: Murphy 12" V180C console 1950

Excellent John,

That Ekco LOPT is rock steady! I agree with what you are saying though,
it's very important to keep the set original.
I can't wait to see the chassis back in the cabinet now that it is all working and has proved its reliability.

Cheers
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Old 21st Oct 2014, 2:29 pm   #46
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Default Re: Murphy 12" V180C console 1950

It's now gone a full 18 hours on soak and not a flicker! Focus has held so I will tidy up the temporary transformer [I will post pics] and fit the chassis back in the cabinet. I will attempt to do this by the weekend but don't hold yer breath! Thanks everyone for you encouraging comments. Now over to David's...Regards, John.
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