FPGA VAX update, now DIY TTL computers

[Chuck Guzis]

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