[TMC] Rectifier replacements

[rrkrr]

Larry,
Gas filled rectifiers have very low forward voltage drops.  For mercury 
vapror, the forward drop is on the order of 10 to 15 volts and fairly 
constant, as long as the tube is operated within its rated current.  
High voltage solid state rectifiers are usually made up of a stack of 
several diodes in series in order to reach the required peak reverse 
breakdown voltage rating, with a forward voltage drop of about 0.7 volts 
for each diode in the stack.  When replacing mercury vapor rectidiers 
with high voltage solid state rectifiers, its likely that the resulting 
DC voltage will change only by a small percentage, and may actually be a 
bit lower for solid state, depending on how many series diode junctions 
are in the stack.

Bob
WB4TGG

telegrapher at att.net wrote:

> The SBT-1K uses 872 rectifiers.  I've found some 4B32 solid state 
> units which have a note on them that they are replacements for the 
> 872. Should i or should i not use them?  I don't know how much the 
> voltage would increase but it would be Ep only.  I don't think it 
> would hurt the 8295 which runs 3100V on it now with the 872's.
>
> Comments.
>
> Larry
> W0OGH
>
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