[Hallicrafters] Sizing of Electrolytics

[Rodger Singley]

Jim,

The only size concern would be on the input to the filter.  I assume the 
S40A has the standard circuit with a capacitor on both the input and output 
sides of the filter choke.  A larger capacitor on the input side (on the 
line from the rectifier to the filter choke) will increase the B+ and the 
peak current through the rectifier and transformer.  The latter is the more 
important as this will heat both the rectifier and the power transformer 
more than the original design.  If the circuit uses a 10 on the input side 
I would replace this with the same or a close value to avoid excessive 
heating (a lot of the hallicrafters have hot running power transformers 
anyway so it is better not to add more thermal stress).  You could still 
use your 40-40-40 can and use a little cap from mouser under the chassis 
instead of connecting the 40 uf section.  I presume the other 10 section is 
probably the cathode bypass for the output tube and the 40 will not be a 
problem here.

73,
Rodger WQ9E