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Question on CCS Module

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I have a couple questions on the CCS module from DIY.. I bought a couple of them and have a question on application. If I want to use it in the cathode of an output stage (in place of the cathode R of a pair of PP EL34 for example), how much voltage do I need across it? There is already 34v across the shared cathod R, will that be enough or do I need a negative supply under that? Secondly, how do I know how much of a heat sink to use (assuming I need one). At 34v and about 90ma total, that would be a little over 3W, is a heat sink needed, and if so, how do I know how much? On antoher note, I do want to say it seems like for $19 ea, we wouldn't have to go and cut traces and stick components over them, can't the board be made to fix this? And, is there a picture of the top of the assembled board?
Thanks!

Follow Ups:

RE: Question on CCS Module - driguy 01:23:11 11/26/08 (1)
Hi Steve, I am not sure about the configuration as I used mine on a driver tube for the LadyDay. You can calculate the wattage by measuring the voltage drop across the CCS and multiplying by the current you set. At 3 watts you can get by with a clip on heatsink. Regarding the board, throw it away. It gave me more headaches than it is worth. Solder the necessary resistors right to the terminals as per the schematic (that I hope you have). The board is mis-labeled making it more confusing than if you just solder right to the chip. The specs for the chip can be found on the net. The data sheets will show you the terminal connections and all other vital info. If you do mount the chip to a heatsink using a mica insulator be sure not to over torque the mounting screw . Check with your VOM to be sure that you have not shorted the body of the chip to the heatsink.
- RE: Question on CCS Module - SteveBrown 08:00:36 11/29/08 (0)
  Thanks, driguy. I did use the board, but yep, sure isn't what it could be. I am using them in the cathode of PP EL34 right now, biased at 100ma, and attached to chassis plate (w/appropriate precautions of course). Seems to run fine w/o excessive heat.

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