9 Nov
2005
9 Nov
'05
5:13 a.m.
On 11/8/2005 at 11:35 PM William Donzelli wrote:
Running tubes at low plate voltages was not really an
innovation -
engineers had always done this, and many normal tubes will actually work
at a quarter rated plate voltage or less.
I had a few of those submini dual triodes, wire leads and all.
I seem to remember a code practice oscillator built around a 6SL7 with
nothing but a 6.3vac filament transformer for power (out of an old ARRL
handbook, maybe?). It put out enough to be heard in headphones.
Cheers,
Chuck