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Alairex - H.A.L.O. Overdrive

Posted: 01 Dec 2012, 16:05
by Saruman_
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Re: Alairex H.A.L.O. Overdrive

Posted: 01 Dec 2012, 16:26
by LaceSensor
Nice pictures
Thought this sounded pretty nice actually, justifying the amount of shit in there!

Re: Alairex H.A.L.O. Overdrive

Posted: 01 Dec 2012, 16:34
by okgb
Allot of diodes , I'd like to see the top outside , curious what controls & switches there are
and Ohhh secret I.C.'s ................

Re: Alairex H.A.L.O. Overdrive

Posted: 01 Dec 2012, 17:27
by deafbutpicky
From looking at the solder side, I'd say the 16pin IC in the middle is a CD4049UB. pins 13 and 16 are free...
Another guess: It's for the saturation mode.

Re: Alairex H.A.L.O. Overdrive

Posted: 01 Dec 2012, 20:28
by Saruman_
From looking at the solder side, I'd say the 16pin IC in the middle is a CD4049UB. pins 13 and 16 are free...
Another guess: It's for the saturation mode.

no, it's part of the switching. no CD4049UB

Re: Alairex H.A.L.O. Overdrive

Posted: 02 Dec 2012, 02:10
by atreidesheir
Big ups Saruman!
Every time you post it is juicy.
Incredible amount going on for an od.

Re: Alairex H.A.L.O. Overdrive

Posted: 02 Dec 2012, 06:48
by Saruman_
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other diodes are used for control switches J113

Re: Alairex H.A.L.O. Overdrive

Posted: 02 Dec 2012, 15:48
by atreidesheir
15 transistors
5 integrated circuits (counting the double)
and 6 diode sets (not counting the singles - i am guessing some assymmetrical pairs also)
that is really intricate for what it does.

If it was lovepedal, I would say maybe 5 electra distortions in series with 2 or 3 landgraff tubescreamers with "clipping options"

Re: Alairex H.A.L.O. Overdrive

Posted: 02 Dec 2012, 16:42
by Lucifer
And here it is - the LP Cooling system for nuclear fission plants.

Re: Alairex H.A.L.O. Overdrive

Posted: 02 Dec 2012, 20:46
by morbidalex666
Original or not, this one sounds killer in the demos.
Complexity -wise, it does rival mr Tripp's designs IMO.
Pretty expensive too!

Re: Alairex H.A.L.O. Overdrive

Posted: 03 Dec 2012, 12:19
by Ice-9
He's went to a lot of trouble even grinding of the value of the box caps .

Re: Alairex H.A.L.O. Overdrive

Posted: 05 Dec 2012, 06:34
by Saruman_
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Re: Alairex H.A.L.O. Overdrive

Posted: 11 Dec 2012, 05:37
by Saruman_
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Re: Alairex H.A.L.O. Overdrive

Posted: 11 Dec 2012, 08:10
by bajaman
whoa :shock:
Is that a three layer board - looks like yet another tubescreamer rat combo with a speaker simulator and baxandall three band eq :roll:
would be interesting to see the filter values and interesting input buffer stage :lol:
bajaman

"why use a 12A*7 tube when a dozen op amps will do the job just as well" quote for the day :secret:

Re: Alairex H.A.L.O. Overdrive  [traced]

Posted: 14 Dec 2012, 04:38
by Saruman_
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Re: Alairex H.A.L.O. Overdrive

Posted: 14 Dec 2012, 10:09
by bajaman
Thanks to Saruman for the values :thumbsup - here is the really interesting bit :wink: - the post clipping filter response after the clipping stage and up to the master volume controls.
Halo post clipping filter response curves.gif
The graph shows the response as the signal passes through each successive filter / gain stage.
The red curve shows the input (normalized for a flat response)
The next curve (green) shows the response after the broad mid notch and gain recovery stage.
The blue curve shows the response after the first op amp low pass filter stage.
The purple curve shows the response after the second op amp low pass filter stage.
The yellow curve shows the response after the third emitter follower low pass filter stage.
AND the pink curve shows the response after the final broad notch filter and output buffer op amp stage.
cheers
bajaman

Re: Alairex H.A.L.O. Overdrive

Posted: 14 Dec 2012, 17:41
by Saruman_
True sound of HALO very close. But the feeling when you play nice.
I tried my version. It sounds almost exactly like the original Halo.
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Re: Alairex - H.A.L.O. Overdrive

Posted: 04 Sep 2018, 09:49
by roseblood11
Did anybody ever try to make a pcb for the original circuit or for Sarumans stripped down version?
Sarumans version should be even small enough for veroboard in a 1590bb