Got a pair of Paramour 1 (Hammond PT) from a friend. Love it. Want to upgrade the irons with the Iron Upgrade Kit for S.E.X. Kit 2.0. I noticed some owners also bought the C4S. Is this also a good upgrade option? What's its purpose and which version should I get? Thanks.
I would do both, but please only do one at a time, as it's so much easier to debug things that way!
Yes, SEX 2.0 iron upgrade is what you want to go for. The instructions will give you secondary wiring instructions, but you'll need to wire for one impedance higher than what you're using. So if you have 8 ohm speakers, wire the OTs for 16 ohms, etc.
You can stuff those boards with all the parts from the SEX C4S upgrade kit. You will need a 1.5K cathode resistor for each amp.
In one Paramour, send the green twisted pair of wires to pins 4 and 9 on the 9 pin socket. Wire the 1.5K resistor from pin 3 to ground. Signal in from the RCA jack goes to pin 2. Output of the C4S (the "O" terminal) goes to pin 1. Pin 1 also leaves and feeds the coupling cap. The "I" tab on the C4S board needs to be fed by B+ (ask if you aren't sure where that is) and G goes to ground.
In the other Paramour, send the green twisted pair of wires to pins 5 and 9 on the 9 pin socket. Wire the 1.5K resistor from pin 8 to ground. Wire the incoming signal from the RCA jack to pin 6. Wire the "O" from the C4S to pin 6. Pin 6 also leaves and feeds the coupling cap. The "I" tab on the C4S board needs to be fed by B+ (ask if you aren't sure where that is) and G goes to ground.
Voltage on 3/8 should be about 3V. Voltage on 1/6 should be about 180V.