Jeff Liebermann wrote:

On Sat, 19 Jan 2013 21:07:00 -0800, Jeff Liebermann
wrote:


There are various DO-17 packaged germanium diodes in the 1N3712 thru
1N3721 series available on eBay, but no 1N3712.


Look what I found in my collection:
http://802.11junk.com/jeffl/crud/Tek-Tunnel-Diodes.jpg
Sealed from the factory and untouched for who knows how long. The
tunnel diodes came from a rather large collection of original Tek
repair parts. There are probably more tunnel diodes in the box, but
it will take some effort as many of the smaller parts are not in
numerical sequence:
http://802.11junk.com/jeffl/crud/Tek-Parts.jpg
Make me an offer (via email please).

I too have some TD's, just not sure what numbers they are, however, I
remember not too long ago replacing a TD circuit with a fast dual
comparator from Analog devices. I was able to get the valley effect
to make the following circuit happy.. This was to keep an old piece
of equipment operating (not a scope).

Jamie