What is that swirly/schwoosy sound when certain amps are cranked?

Hey Mike, no sarcasm intended, but I have no clue as to what you're talking about . I've never heard it on any amp. BUT I haven't played those amps that you're referring to so that might explain that. I've owned 40-60 amps since 1974 tho and have fixed lots of friends amps and played lots of friends amps and never heard it. Is that a good quality of the Komet60 and Divby13's to you or is it an oscillation from having a presence control too high with a non-feedback loop, and what other amps do you hear it in etc? ERIC

 

Howdy Eric. Hows that Purplexi doing? I miss that thing.

I think he may be refering to the eb and flow of electrons as thay dance acroos the milky way of the amps circuit. :NUTS

 

I thought it might be an inner-ear infection myself!!! Or shrooms.. Mike I'm totally kidding but have still never come close to having heard it. Red Planet might not have played a Komet or Div by 13 either tho!!!!!! And yes that's a beautiful amp RP!


ERIC

 

I remember my Bad Cat Cub2 had that sound. I remember there was a Bad Cat Panther (cub) at the Michigan TF. As we went around the room, as soon as that amp was played, there it was again! Turned up 1/3 to 2/3 and it was very much there, unlike all the rest of the amps in the room.

 

Eric, The old Tweed amps have lots of swirl when you crank 'em, some marshall will too. Lots of amps do it. I can hear it easiest with humbuckers, especially a neck bucker. Crank up an old tweed and play that call and response lick from "Outside Woman Blues" Cream, and you'll hear it.

 

OH gosh, I haven't heard any Cream guitar in 30 years! Seriously , are you and Mike LITERALLY saying the sound swirls around like a phase shifter? The 1st thing I thought of (other than the 'shrooms' reply) was some type of phase cancellation effect. Still I've never experienced it with any amp cranked.. Do you like it?

ERIC

 

Good one, Nah, I just need to play those amps. None of mine do it. So it's a characteristic of those types of amps that you don't like? Also , is the Blankenship a 'tweedish' design (as Mark mentioned it happened in the old tweeds too) I've never owned or played any old tweed.. I have a 62 Brown Deluxe that sounds totally normal up to 10 , and an old THD blues/tweed bassmanesque design that didn't do it either, but neither is anything like a lo-watt Tweed amp really . Eric

 

I know the tweeds I've built have this magic "reverb-like" effect going on, like the Keebler Elves snuck in one night and installed a reverb pan and a tube or two when I wasn't looking. Really cool tone.

 

+1, bigtime.

 

I am pretty well convinced that the swirl I hear and that everyone talks about is frequency cancellation/reinforcement from the back of open back cabs.

I don't hear swirl with a Marshall 4x12 but do hear it with a BF Fender combo. I don't hear it outdoors with any amp.

I think it's just a very subtle phase shifter/chorus effect caused by the room and an open back cab.

MHO of course.

 

I've never understood the term "swirl". I don't hear it. I've owned or heard every amp mentioned in this thread and I can't say I know what you guys are talking about. Anything swirling or phasing is a negative in my book. My amps might have a ton of swirl or none at all for all I know.

<M

 

You mean "Swirl" right?
I'm not an amp designer (thank God - subjected to the rules of fashion and geeks like us......oops forget I said that....) but I've noticed it is lacking (for example) in Wide Panel Tweeds (generally) and backwards but is most prominent in Narrow Panel Tweeds and their like. As the main difference seems to be the gain structure I believe it is the relationship between the pre-amp and power section.

Btw the way you get no swirl after you shut your index finger in a car door as I did earlier this week..........

Best, Pete.

 

i kinda think thats what i heard in my bad cat cub 2 when turned up loud. i dont have it now so i cant compare. havent cranked my hot cat 30r high enough to hear that yet.

 

The first JTM45 reissue I ever modded did not have much of this swirl stock. After changing the filter caps from two double 50uf caps to one double 32uf and one double 16uf it had loads of swirl.
EricB, your Butler modded amp has got to do this cranked with humbuckers. I hear it easiest on the wound strings.

 

Clips of zhoozh?? RF politician is that an example??