Chris Byard wrote :
> I guess the Germanium power transistor used in the
> given circuit would probably deliver the wetting
> current as its gain is probably fairly low. However
> finding one now would probably be a bit difficult- my
> usual Google entry of HEP235 data turned up nothing so
> it's probably obsolete, along with the zener diodes
> quoted too. The circuit was probably a junk box
> special back in 1969 when the originator used
> it........
My apologies for not checking on device availability before posting the
link.
An NTE-127 is listed as a replacement for the HEP235, I found several places
on-line that appear to carry it. Likewise, NTE-5158A replaces the
HEP-Z2547. However, at the price I found listed for a NTE-127 (US $32), IMO
this circuit is not worth pursuing.
Sorry for the wasted bandwidth
Randall
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