[Boatanchors] 6x5 Rectifiers Used In TCS Shore P/S

[WA5CAB at cs.com]

In this particular case, I don't agree.  The original rectifier is a 
bridge.  A silicon bridge has a forward drop of almost 1.5 volts which is on the 
same order of magnitude as the (probably) selenium bridge being replaced.  
Plus there is no filter capacitor.  And if there were, it would be smaller 
than current practice, anyway.

The only LV rectifier replacement where I have found that a series resistor 
is beneficial is in the PE-104-A Vibrator Power Supply (p/o SCR-284).  The 
third version has, and the first and second versions should have added, a 
ballast rectifier (AKA shunt regulator) downstream of the bridge to limit the 
nominal 1.4 VDC to the tube filaments when the vehiclular battery is fully 
charged and the engine/generator is running well above idle.

Robert Downs - Houston
wa5cab dot com (Web Store)
MVPA 9480

In a message dated 08/25/2016 13:14:13 PM Central Daylight Time, 
bob.groh at gmail.com writes: 
> You need (or maybe should use) a surge resister with your dry rectifier 
> replacement - pretty much for same reasons - surge limiting for caps and to 
> make up for (some) reduction in voltage drop with solid state. Although if 
> it is a single plate selenium, I think the voltage drop is only a couple of 
> volts(? 1 to 2V per plate??).  Regardless you should have a series 
> resister.  Or at least in my opinion.
> 
> 
> Bob Groh, WA2CKY
> 
> 
> 
>