On Sep 28, 8:51 am, wrote:

bob you are right about the Mallettecs not having TE capability. Look
forward to hearing what you have, maybe I can Frankenstein a few of
them into a workable unit. thanks!

Well, drat. The box I thought had a Piep in it actually contains the
four or so separate modules of an ancient Hornig electric vario
system. And some correspondence between Graham Thompson and Charles
Drew, who appears to have been the original purchaser. Charlie built
an HP-11 (N1954), and later I think an HP-18.

There's one more box of old instruments up at the shop, if you send me
a reminder email next Friday I'll check that next weekend.

Thanks, Bob K.