[Milsurplus] DY-105/GRC-9X Relay K3

[WA5CAB at cs.com]

It does work in the later version PE-104-A's where they used a selenium diode 
stack as a shunt regulator, which they at the time called a ballast 
rectifier.

In a message dated 9/4/2008 7:42:22 PM Central Daylight Time, 
brunneraa1p at comcast.net writes: 
> Ballast tubes do indeed respond in seconds, but much too slow to follow 
> keying, and do take minutes to fully stabilize.  The selenium rectifier is used 
> forward-conducting to utilize the knee of the curve to provide some voltage 
> regulation to the 3A4 tube filaments.  Silicon rectifiers average 0.75 to 0.8 
> volts forward voltage drop, and I've used them successfully for low voltage 
> regulation.  Three or four in series might work fine, but the voltage might be 
> a bit too low, or a bit too high. It's worth trying.
>  
> 
> 

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