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All I know so far is my exp with the CTC-16(x-l)
Modern electrolytic caps are much smaller and better lasting than they were in the 60s, there is no stated rule that the B+ caps MUST be replaced with the EXACT value uf and voltages, nor must they be placed exactly in the same place physically, as long as they have the same connection electronically.
As Electronic M and others has stated, the old can can be stuffed with the needed values or in most cases with values 10%-20% higher uf/voltage and function wont be affected, and since as I mentioned, the newer caps are much smaller, they can fit almost anyplace.
For example, on mine I started from the top of the voltage divider tree and worked down ( checking voltage every step) , first cap replaced, right out of the LV bridge rectifier was 80uf @ 450v now 100uf @500v, same with the next, 30uf @ 450v now a 40uf @500, and so on and on... till all filters replaced,
B+ is measured an stable, old caps still in, but un-hooked, none of the new caps can be seen from above
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