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These notes apply to all valve (tube) radios and TVs.
You get HT (B+) immediately with solid state, before the valves (tubes) have warmed up. This gives a higher HT voltage than normal for a short period which may overstress some components. You will usually need a surge limiting resistor in series with the solid state rectifier to limit peak current and get the correct HT voltage.
If the set uses series connected heaters then you will need to keep the original valve heater in circuit or replace it with an equivalent resistor. Otherwise the heater connections don't matter if you repalce with solid state. (In UK parlance filament is only used for directly heated rectifier valves - you won't find them in TVs very often)
Unless you have to replace a hard-to-find rectifier valve or have some other good reason for going solid state, them keep it original. Good reasons might include a transformer running near its limits where the power needed to heat a rectifier can be usefully removed. Or a set where the heat from the rectifier is having a bad effect on something.
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