[GreenKeys] Appropriate relay use

[amourdutigre]

Here is a question that I have been pondering of late.

As I have posted before, I am building an AFSK generator to use on a VHF radio (eventually), of the W2PAT flavor. The design uses a resistor that is shorted to ground by the keyboard contacts to shift the frequency between mark and space.

Here is my dilemma...I wish to not only be able to use this box with "dry keyboard" contacts shorting a resistor, but also with occasionally in a current loop, say if I want to transmit a punched tape going through a reader. 

This is my question: what sort of relay should I use to do this with? The loop current is 60 mA, so I know that the relay coil should be able to handle 60 mA. What about the required voltage to actuate the relay? Any suggestions on type or variety? I would prefer something in a glass envelope to go with the tubes that I found for the unit.

Best and 73

Joe Herdler
KB0TXC
Greenkeys
TCI
/NNNN