[Hallicrafters] HT-37 low voltage rectifier

[Edward B Richards]

Perhaps you got one or more diodes in backwards or didn't use a dropping
resistor for the lower voltage loss from the SS diodes. Are the diodes
rated high enough for the PIV? Should be about 3X the DC voltage. Can you
measure the line draw and compare it between the tube and the SS diodes?
Good luck.

Ed Richards K6UUZ


On Fri, 7 Nov 2003 08:17:34 -0500 "Riley Hollingsworth"
<rholling at adelphia.net> writes:
> I have re-capped the HT-37, gone over it and fired it up.  I haven't 
> loaded
> it yet. I noticed a medium level buzz in the power transformer that
> disappears when I take the low voltage solid state replacement out 
> and put
> the 5V4 back in.  I'll just leave the tube in to do the performance 
> test,
> but why would it cause the transformer to buzz ? The transformer is
> perfectly quiet without the solid state LV.  I think at least one e 
> mail
> said to not replace the LV rectifier with a solid state---looks as 
> if I'm
> about to find out why!
> 
> 
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