[ARC5] The "new" MF band.

[Peter Gottlieb]

I used to get them at the local scrap yard super cheap when I lived in NY.  I 
don't think they are very common these days, replaced by better regulated 
equipment and on-line UPSes.  They worked just fine.

I got rid of all of mine during my last move.  The weight adds up, even the 250 
and 500 VA ones.

Peter
kb2vtl

On 9/16/2017 7:09 PM, Richard Knoppow wrote:
> Every so often I suggest using a Sola type constant voltage transformer to 
> regulate power to radio receivers. I always gets sneered at. Sola transformers 
> provide very well regulated voltage and will absolutely get rid of drift do to 
> filament voltage variation. The complaints that they put out lot of harmonics 
> was true only for the very early ones, most later CVT put out quite acceptably 
> pure sine waves. They are somewhat noisy but can be muffled. They also tend to 
> run hot. They are also fairly heavy but we are dealing with boat anchors here. 
> CVTs have some interesting properties, for one they shut down if the output is 
> shorted. They are also very good filters for junk on the power line. Used ones 
> are not too expensive but make sure it works. CVTs are dependent on the 
> capacitor in them and I think can develop some mechanical problems, however, 
> if the output voltage is as rated they are usually OK.
>
> On 9/16/2017 10:09 AM, Bill Cromwell wrote:
>> Hi Ken,
>>
>> I have been using batteries for both the heaters and the B+ (90 volts) on 
>> mine. I noticed a small frequency shift whenever my space heater blower 
>> kicked on off. The batteries got rid of than and reduced the power line crud 
>> too.
>>
>> 73,
>>
>> Bill  KU8H
>
>