DIY variable output attenuator (L Pad / power soak) ?

ok. so the little 5W epiphone valve junior is fab. but even at 5 Watts, it can be too loud.

i've had the unit a whole three days, and now it's time for the first mod.

so - what do i need in order to build and fit a passive variable attenuator (L Pad / power soak) ?
i presume more than simply a 5W (50ohm?) pot is required?!

any advice would be appreciated.

chris
mfdu

edit - would this do? ER - 10 Watt Monaural Volume Level Control (Audio L-Pad) www.rsaustralia.com stock # 2508977497 - $19.90
2nd edit - www.jaycar.com.au - 50 Watt RMS Fader - Mono #AC1672?? - $19.90

This was discussed just recently. Check this out:

http://www.groupdiy.com/index.php?topic=22151

thanks boss - i did a search but couldn't spot that thread.

chris.