<p>Ellis, thanks for responding. I called Peter at the Flash Clinic based on a previous post of yours years ago. Unfortunately however, he no longer makes the converter cables. The variable voltage issue you cite is indeed an issue if you are trying to use Speedo heads on Norman packs because the model light dimmer channel also supplies the fan voltage. But this not an issue when trying to use Norman heads on a Speedo pack. I appreciate you advice not to bother and understand your logic. However, I personally benefit from full stop less efficient output form the norman heads this means I have a wider latitude in my power range from a 2403cx by switching to a Norman head. I regularly use 7ft parabolic silver umbrellas with no diffusion which is incredibly efficient. One stop less light is a welcome addition. And last, I'm also doing this out of sheer necessity. My last P2000d exploded last week (I have 6 dead units now with multi diode explosions in the top board). I'm left with twelve orphan LH2000-24000 and 8 Speedo packs ready to adopt them... <br /><br />Fortunately, since you having these adapter cables on hand, we can easily reverse engineer them to figure out the cable modification. You are holding the "Rosetta stone" to translate Norman into fluent Speedotron If you are up for it I'd really appreciate it if you can take a look at the wiring changes made to accommodate the different pins in each system. There are two ways to do this: <br /><br />The first is to simply unscrew the housing to reveal the back of the connector which has 9 solder joints correlating to each pin. Each pin is numbered with a numeral printed on the back of the connecter. Start with the Norman female end and write 1-9. Next to 1-9 write the color of the wire. 1 red, 2 black, 3 yellow, etc. On the Speedotron male end do the same. There will be one or two wires that wind up at different locations and possibly one jumper cable either added or removed. This would just be a matter of matching colors to numbers. <br /><br />Alternatively you can also acquire the same information using a meter set to continuity if you don't want to unscrew anything. When the probes in continuity mode touch they make a beep sound. You can then touch one probe on the male speedotron exposed pins and then match up the location on the female Norman end. You will get a sound confirmation when the wire has continuity so we will know where the wire goes. If you get continuity on multiple pins then we know those pins are jumped. You can label them as 1 to 1, 2 to 2, 3 to 8, 4 to 4+5, etc. indicating continuity. <br /><br />My description may make it sound like more work than it really is. But if you are willing to take a few minutes to do this, I'd be happy to make the modifications to a Norman lamphead, test it, and put together a DIY tutorial with photographs and schematics for others on the forum. I have looked high and low for this info with no luck so I think others could benefit from it if it became available. That or if you are willing to sell one or more of your cables I'd be interested to get one to model my mods off of them. <br /><br />Thanks for for your time and I look forward to your response. </p>