Re: "That Cap"
Yup.
The majority of valve radios have a triode (or pentode) audio amplifier which drives the output valve via a coupling capacitor. And the capacitor is usually a paper dielectric jobbie, which over time goes leaky.
A little leakage in most capacitors does no real harm, but this is the exception! Leakage makes the output valve draw too much current. Distortion is often a result, and long-term the output valve, the rectifier valve, the output transformer, and the mains transformer could suffer.
So, most radios have 'that capacitor' and usually it needs replacing. That's why it is called 'that cap."
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