ARP 2600 TZ-581 replacement?

[JWBarlow at aol.com]

Many years ago I had to replace the TZ-581 in my ARP 2600 keyboard (my then
girl friend, a keyboard player, borrowed the ARP and managed to plug the
keyboard in backwards -- the relationship ended shortly after). The TZ-581 was
no longer being made, so I got some NTE "equivalent. Since then, I've never
been able to get the low C to anything above -0.11 volts (like the obvious
0V).
1) Is the TZ-581 a germanium device?
2) In these circumstances, is it common practice to just piggyback another
resistor into the circuit in order to bias up the voltage?

John B.
"A text may be deconstructed by a post-phenomenolgical philosopher, but
postmodern musicians just decompose." JB 1988