This is emittor commoned matched pair PNP transistor module. this module has pair of PNP transistor that have excellent pair characteristics.
This module is designed to make your experiments easy. Use it on your bread board. You can use it for your original projects, of course
this module used for beatnic.jp’s products also.
This pair characteristics are good for VCA or VCF. You can use this module at everywhere of analog synth circuits.
#504 has no Temperature compensation resistor. If you need it, choose #503 Matched Pair PNP module with T.C
if you need NPN matched pair module check out #500 Matched Pair NPN module with T.C or #501 Matched Pair NPN module also. 

pin structure is designed as pin compatible with Japanese old good pair transistors like 2SA798 or 2SA1349.
main parameter is just like below.

Comparison of pair characteristic.

The difference of V_EB between two device (|V_EB1-V_EB2| )

The deffernce of h_FE between two device (h_FE1 / h_FE2 )