"I can't imagine why an amateur would want to use a
switching supply for a filament. What reason is there to do
that?"
There could be a few reasons:
1. The amp has to be transported and weight is an issue.
2. There are no suitable transformers available and a surplus switching supply
is handy.
3. Real power transformers cost money and the amp builder is almost penniless
and a switching supply is given to him.
4. The builder, in true amateur spirit, likes to complicate something simple.
5. Just wants to see if it can be done.
I have the Icom 751A with a built in supply. It does just as Tom says. People
on frequency do not complain about the hum - but the white noise off frequency
is substantial. This is definitely a rig that neighboring hams do not
appreciate.
Colin K7FM
_______________________________________________
Amps mailing list
Amps@contesting.com
http://lists.contesting.com/mailman/listinfo/amps
|