[sdiy] ARP 2600 VCA - 4019 module

[Dave Leith]

Has anyone built this circuit from the ARP schematics from
http://www.arptech.synth.net/modmain.htm ?

I can't get the signal out to match the signal in (unless I change
some resistor values.) It's about half the level out compared to the
input. I have double checked resistor values, transistor
orientation/polarity and have used the circuit layout from the
schematic package, and messed with the trim pots. I've also measured
voltages and they seem about right except the current swing is too
small....

Oakley makes a similar module as do some of the boutique repair shops
so it should work correctly unless I'm missing something really
obvious (quite possible especially after the number of hours staring
at it :-) or I wonder if the parts values are correct as shown.

Any suggestions?

Thanks Dave