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Old 11th Dec 2018, 10:19 am   #25
peter_scott
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Join Date: May 2003
Location: Edinburgh, UK.
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Default Re: 1938 Murphy A56V television restoration

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Is that your understanding of the situation? Does anyone care about this?

This HMV 900 seems to have more Baird circuitry present than anything else I have seen. From what I can tell it is complete bar the standards switch.
Hi Catkins,

I'm not sure about the extent of Baird circuitry remaining in sets with top blanking. I certainly think it's worth being able to display 240 lines 25 Hz. Finding a standards switch that can fit in the limited space of the original is the only difficult part.

My set never had the Baird circuitry and I had intended to fit the Baird valve on a small piggyback chassis but as it happens the graphics card signal generation gives me line pulses during the frame sync so I only needed to incorporate the switchable timing components and I mounted my standards switch on the bracket of the push about centring pot rather than risk damaging my plastic switch cover.

Regards,

Peter

p.s. Your Murphy picture is very impressive and devoid of any trace of ion burn.

Last edited by peter_scott; 11th Dec 2018 at 10:26 am.
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