[ARC5] UPS Transformers

[Bill Cromwell]

Heh,

Rich I just posted about that. Maybe some of us spec our parts as close 
to the bone as we can. I believe most of us build with conservative 
specs. The transformers I used in the ARC-5 power supply (so I don't 
'appreciate" the dynamotor *noise*) are back to back 24 volt units that 
are rated for four times the power required by the entire radio - 
heaters and plates all in. They are silent and run cool.

The plate supply I built to power a single 6146B 'boot' for my QRP radio 
turned out capable of melting a 6146 when the grid bias connection 
failed. The power supply didn't moan or sigh or grunt or groan. When the 
6146 rolled over the current stopped. I added a fuse and continued 
business as usual..with a replacement tube and bias resistor.

I still have that transformer. Maybe I should get a bigger tube and 
build a voltage doubler with that iron. My garage shack will be used for 
the old tube gear while the cute stuff lives in my new "civilized" 
library shack in polite society. The tubes could provide half the heat 
to warm my garage shack <evil grin>.

73,

Bill  KU8H


On 11/18/2015 09:59 PM, Rich Post wrote:
> I guess I'll have to stop using my back to back UPS transformers as an
> isolation transformer solution as I have been doing for a couple of years
> despite the fact that they don't seem to be running hot at all.
> Brian, could you possibly be running US-made transformers at 50 Hz in Oz?
>
> Rich KB8TAD
>
>