I've just taken delivery of a Squeal Killer direct from Jason Lockwood and have made a short video review using both my Fender Bassman RI LTD and the Harp Train 10 from The Lone Wolf Blues Company.
I have to say I'm impressed. I wasn't expecting great things from using it with the HT10 as Jason himself said the Squeal Killer is best suited to large powerful amps but I found it did the job really well and allowed me to push the HT10 to greater volumes without feedback.
I had even better results with the Bassman. Once I'd upped the treble and volume a little bit it sounded really sweet to my ears. Much more punchy tone than I'd been used to.
I previously ran the Bassman with lower gain tubes to control feedback (V3:12AU7, V2:12AT7 and V1:12AY7) but with the Squeal Killer I swapped V3 and V2 back to 12AX7s. Hopefully the results come across in the video.
Obviously I can't speak for how well it works with other amps and tone is somewhat in the ear of the listener, but in my book it's well worth the money if you play amplified with a band and struggle for volume. Does what it says on the tin!
Adam: Nice video, thanks for posting. Your findings are consistent with mine, i.e., that the Squeal Killer works well with both large and small amps alike.
Some advice from my experience with the Squeal Killer and Bassman: If you experiment with your Bassman settings, you might try bumping up the mids to maybe between 4 and 5 to add definition and punch to the sound, instead of cranking the treble to 5. If the mids still do not provide enough treble, try turning up the bright channel volume to 5 or 6, which will add subtle treble in a manageable way.
Nice demo Adam; I have a BM RI also that's been modded quit a bit, I cannot turn the volume up past 4 with out major feedback too. is there a link or web page to Jason Lockwood to get one of those babies, I've tried the kinder feedback pedal and found it to clip when it's suppressing the feedback, I did not notice any clipping on your demo.
I find the it helps, but does not eliminate, feedback. What I like about it is that when feedback does happen, it's controllable, and by just backing off a bit it stops. So you can play close to the edge without worrying about losing control.