[ARC5] NC-270 Success

[Scott Robinson]

Folks,

About line voltage: first, the 117V number that is talked about a lot 
was a result of widespread measurement in the '30s (I think) and this 
was the average. I think the local voltages varied considerably from 
place to place.

If your power transformer gets hotter at 122V than at 110V, as in the 
example below, the iron in it is probably saturating at the higher 
voltage, considerably raising the primary current.  Feeding it 100V is a 
good idea.

If I ever get my home display organized (gotta make the house bigger for 
this to happen) I'll have an auto-transformer built from a 12V 10A 
filament transformer to feed about 110V into an outlet strip that feeds 
the radios. This is easy, and you may have the necessary transformer (or 
2 x 6V 10A units) in your stash already.

Regards,

Scott

On 12/10/16 3:55 AM, jeepp wrote:
> The thing is, most radios made prior to maybe 1960 run a lot cooler at
> something between 110-115 VAC.  I use a variac to supply the bunch of
> older amateur equipment.  I believe that line voltages in many locations
> has creeped up to between 120v and 125v.  That's pushing the upper limit
> of the public service spec.  My NC-183D pwr xformer runs very hot at
> 122v but is barely warm at 110v.  Re-cap and all...
> Jeep K3HVG
>
>
>