[ARC5] Collins xfmr ratings

[Kenneth G. Gordon]

On 15 Aug 2014 at 10:22, Dennis Monticelli wrote:

> 
> I like choke input power supplies, but the critical inductance issue is a
> serious one for CW usage as Ken noted.  You either have to find a high value
> "swinging" choke

...which are really "lovely", but are almost impossible to find these days...

> or put up with wasting a lot of power in the form of bleeder
> heat.

Which is one reason why, despite their added complexity, I MUCH prefer 
regulated HV supplies.

>  I would like to share a workaround. 
> 
> In lieu of a high wattage bleeder, use a VR tube stack to maintain the requisite
> minimum load current.  Then pick off the appropriate voltage points for feeding
> the Osc and PA screens for the ARC-5.  This is what I do in my setup so my
> bleeders are not power hungry and less power gets wasted.  You only need 150mA
> total (not 200mA)

Yes. I used that figure since it is easier for this old timer to calculate without 
making errors. In fact, I can do a lot of it in my head...

> at 500V for this scheme to power an ARC-5.  Your keying note
> will improve as well.  A fringe benefit is the attractive glow of the VR tubes.

Oh, yes. I sure like the pretty colors! :-)

Ken W7EKB