Bryan's Philco TV-123

[Electronic M]

The set uses a doubler circuit in the HV so the doorknob caps need to be replaced with other doorknobs of the same rated capacitance and same or higher voltage. If the capacitance is not the same the HV may drop or increase. The original part probably has a tolerance rating. The only way you can use a part of another value is if that part is within tolerance of the original and the replacement has a tighter tolerance whose bounds do not fall outside the bounds of the original. most doorknobs were made in the time around when these sets were in use so closer tolerance parts that fit in bounds are probably harder to find than the right part.