On Sun, 8 Jun 2008 12:21:03 -0700 (PDT), VA3NGC
wrote:

Thanks. That is what I thought as they were found in an AK20 that had
one 201a in it along with these R221's. Physically the R221's are
different looking than the 01a's as they have a double filament like a
071a has. The filaments also burn much redder than the 01a filaments.

If they were mine, and the AK20 was used very much, I'd swap them out
for regular 201A's. I bet their 0.6A filament's life is a lot shorter
than the regular .25A ones...

But what do I know?

Dale