First question would be to find out exactly what you are trying to do??
1. Are you wanting to be able to crank your tube amp up to get the power tubes into saturation/distortion, yet be able to keep the over all "volume" at a resonable level ( this is the most common road traveled
)
2. Are you using a S.S. amp? If so, then you're barking up the wrong tree
-- Just build a cheap ISO. cab --- The Attenuator doesn't do any thing for SS amps.
The THD HotPlate is a good unit (though over priced a bit IMO)
The Weber Standard Mass Attenuator is a much more versital unit for recording and over all in general ... again, IMO.
Here's some info on Attenuators and how they work (don't worry, it's pretty short
)
http://www.tedweber.com/atten.htm
Here's the one that I've been using and it works great........it also has a Direct/line out feature with a whole EQ'ing section which comes in handy from time to time as well.
https://weberspeakerscom.secure.powweb.com/weber/mass.htm
Rick