[ARC5] Battery Tubes Experiment

[David Stinson]

I have many of the battery octals because several of my sets use them.
I enjoy working with them.   Three silicon power diodes to ground are 
cheap insurance against blown filaments.
The only thing I don't like is that  the "glow" is quite dim.
There are some which are most commonly found in the 
battery sets and they would seem a good place to start.

Suggested subs for an "ARC-5" experiment:

12SK7 - 1N5
12K8 - 1A7
12SR7 - 1H5 (silicon if second diode wanted
               or 1H6 at slight derating for dual diode)
12A6 - 1A5 (if series fils) 1Q5 (if parr. fils)

List of many of the battery types at:

http://www.fourwater.com/files/batradio.txt