One of my favorite indirectly heated drivers for small output tubes is the 6N7 which was already presented as tube of the month almost 2 years ago. There is an electrically equivalent tube which is a predecessor of the 6N7. I have used it in the past as drivers in 45 amps. It's time that it get's it's own place in the Tube of the Month series. Here is the 6A6.
Let's see how this looks on a curve tracer with a different scale:
Looks like anything a tube audio designer can wish for!
The top of the Ken-Rad tube:
This is a 6A6 from my collection which came in a generic white box. No brand marking visible on the tube. It has a dark brown base:
The top construction is a bit different from others. It only has a tiny mica strip for alignment of the electrodes and large springs which hold the entire structure:
Now let's have a closer look at the internals by dissecting a tube. We will examine this General Electric 6A6:
First the glass has to go off: