[Hammarlund] HX-500 trials

[Kenneth G. Gordon]

On 26 Apr 2016 at 20:58, Richard Knoppow wrote:

>     Trimming on this one.  Someone mentioned the ratio 1.414, i.e. 
> square root of 2 as the ratio of input to output of a full wave 
> rectifier.

That is for a capacitor input filter.

>  For a choke input supply the ratio is 1.111.

Yes. I always use the factor 0.9 for choke input.

> So, taking the 
> HX-500 supply as an example the voltage at each rectifier plate is given 
> as 895V AC so the output voltage would be 895/1.1111 = about 805 volts 
> assuming no losses in the rectifier or choke and a choke of infinite 
> inductance.

805 VDC for a pair of 6146s is NOT excessive..

>  In a real world circuit the voltage would be lower and will 
> also depend on the load. The handbook indicates a plate voltage of 
> around 790 volts at the output tube plates, which makes sense from this.

I am beginning to suspect you may be correct about his measuring instrument...

Ken W7EKB