On Wed, 16 Nov 2011, dave wrote:

On Wed, 16 Nov 2011 08:01:11 -0600, D. Peter Maus wrote:

On 11/15/11 19:05 , flipper wrote:
On Fri, 11 Nov 2011 10:45:09 -0600, "D. Peter Maus"
wrote:

On 11/11/11 08:42 , Lord Valve wrote:
If the **** hits the fan, most hi-mu triodes will work well enough to
build a regen set. Where to get the B+ is the problem.

That simple, since there's only a few tubes.

9v "transistor" batteries in series. It doesn't take that many to get
reasonable B+ and since tubes are low current, it's reasonable.

Of course, towards the end of the life of tubes, one could get some that
ran off 12v, intended for use in car radios. Not so useful now since they
were produced in a limited time span as transistors were taking over, so
quantity is relatively limited.

The R392 ran off 24 or 28 volts, using those low plate voltage tubes. Of
course, it had a lot of tubes so the filament drain was large.

Of course, some people experimented with low voltage on regular tubes. A
loss of gain, but sometimes that was a good thing.

Michael