[sdiy] LM394 vs. MAT02 vs. ?

[Rob Keeble]

Hi,
The original 4014 ARP schematic shows them as matched pairs.

TZ81(NPN) = 2N3904 or 2N5089
TZ581(PNP)= 2N3906 or 2N5087

I'm building a few ARP clones, details are here:
http://www.emulatorarchive.com/AM/AM4000/am4000.html

Regards
Rob
www.emulatorarchive.com

I am now wondering about the transistors used in the 4014 ring modulator
submodules.  Was there any matching going on in there, or did you guys
simply use
transistors straight out of the bag?  The schematic I have (originally from
Joachim Verghese's great ARPtech website, now located at
http://www.oldcrows.net/arptech/modmain.htm) depicts several pairs of
transistors with a colored
circle drawn around the pair, presumably either to indicate matched pairs --
or
does it mean that these pairs are to be physically touching each other, like
the
ones you were mentioning with the brass clips?

I have always loved the way that particular ring mod sounds, and I'd like to
clone a couple of them.  I know that those original Zetex TZ-81 (NPN) and
TZ-581 (PNP) transistors are pretty much impossible to find these days, so
which
currently available transistors might you recommend as substiutes?

Michael Bacich