Rivera RockCrusher Attenuator Load Box for Tube Amplifiers.
I bought this new several years ago, and this worked out really nice for me because at the time I had several Marshall 100 watt amps, that didn't have master volume.
Using the rockcrusher, I was able to play my Marshall tube amps wide open, and have listening levels that didn't burst eardrums.
The unit looks brand new, no scratches, or dents, once you have it set up, it just sits on the top of your amp.
This is a really great tried and true heavy duty unit, Rivera manufactured these perfectly from the start.
Never had any problems this unit works flawlessly.
works with 8 or 16 ohm cabs.
if you have any questions at all regarding connections, rivera is quick to answer on phone, or emails, they have outstanding support.
And best of all these units are hand built, in Burbank California....USA.
They stand by their products, their manual is easily read and obtainable on their website.