[sdiy] LM394 vs. MAT02 vs. ?

[WeAreAs1 at aol.com]

In a message dated 11/5/04 11:58:51 AM, turbo at mustangs.com writes:

<< The ARP PNP/NPN  pairs were never electrically matched at all. Just take 
two 

transistors and stick them together. >>

Hello Dana,

As always, thank you for the valuable ARP insights.  With all the 
misinformation, half-truths, and speculation that floats around the Internet, t's really 
great to be able to get the real skinny from someone who was actually there.  
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