Quote:
Originally Posted by boxdoctor
The screen decoupling capacitor on the first valve is actually across the H.T. supply, and due to this, forms part of the second tuned circuit. It is (from an RF point of view) in series with the tuning coil, providing the RF return path to negative, thus putting the coil effectively across the tuning capacitor (which is correct) at RF. I suggest that you make sure that this capacitor is a really good modern one of low self-inductance. Ensuring this will make the tracking of the tuned circuits more accurate, and easier to adjust if you decide to do an alignment on the set. Tony
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Hi Tony,
That cap is actually a modern one, which someone (who knows what they're doing) must have replaced recently. I'll wire up the chassis again in a moment, and see what readings I can measure while it's running.
I tried to use my scope on it a few days ago, and it's very much affected by the scope probe on it
