Premier Reverb Units
The model 90 has a nice fat wet sounding reverb that solid state imitations can't beat. All the reverb tanks of the time including Fender and Airline sound about the same, but the Premier model used a tricky little circuit with a solid state rectifier that seems to add to the "tubeishness" and is great for harp players. Premier reverbs, if anything, have too much sound and break up easily. Of all the Premier products the Model 90 is the most collectable by mainstream guitar amp affictionados. If you see one, buy it! It is common to see a Guitar player using a Fender guitar and a Fender amp with a Premier reverb.
Model
90 reverb tank
from early 1960's.
Another one
With a cover!!
Model
90 reverb tank
from 1967.
This is top
of one of my Model 90's. It was filthy, abused, and not working when I got it.
You can see that someone put an extra jack through the Multivox patent information
for a cord to the amp. This is makes it easier to use. I play harp through this
and then direct to the PA. All my feedback problems go away and the 12AX7 tube
makes it break up just fine.