Aion Electronics HALO Handbuch - Seite 5

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BUILD NOTES

Bypassing Q4

Some Muff variants such as the Jumbo Tone Bender will eliminate the last transistor gain stage. The

Halo PCB makes this easy to do: just jumper the "Q4 Bypass" pads in the upper-right and omit R20-23,

Q4, and C13. Also, use a 100n film capacitor for CX3 (normally jumpered). Better instructions for these

variants will be added in a future version of the documentation.

Important: If you are building a normal 4-transistor Muff, you need to jumper CX3. You can use a jumper

wire between the pads if you want, but even more conveniently, there are two SMD pads to the left of

CX3 that can be easily connected with a bead of solder to save the hassle of using a jumper wire.

Mids Switch

The midrange switch is a DPDT on-on-on. There are two different types of on-on-on configurations for

the center position depending on the manufacturer:

CONFIGURATION 1

CONFIGURATION 2

Fortunately, the way the switch is set up in this circuit, it doesn't matter which type of switch you have.

The EQ response will still be flat in the middle. Just don't use an on-off-on switch - that's very different.

If you aren't able to find a DPDT on-on-on switch, you can also just use a standard DPDT on-on switch.

You will still have the mid hump and mid scoop modes, but you will not have the flat mode.

Mids Switch vs. Presence Control

Previous versions of the Halo came with an optional modification, adding a fourth knob to control the

midrange contour, called "Body" or "Presence". (This mod was created by Jack Orman of AMZ. More

information can be found in his

AMZ Presence Control

article.)

The trouble with this modification is that while it adds a good deal of tonal flexibility, there is no position

on the body knob that removes it from the circuit and makes it 100% identical to a regular 3-knob Muff.

If you look at an EQ graph of the tone control with the presence modification, it just doesn't have quite

the same curve in any of the positions as the original circuit.

As a result, the new version of the Halo has been changed so that it has a 3-way switch that goes

between the stock setting (scooped mids), a mid hump, or a fully flat frequency response. (The tone

control still pans between a bass cut and a treble cut, only the midrange is affected.)

Some people absolutely loved the presence knob modification, and for them, they should use the

previous version of the Halo which will continue to be available. But one of the requirements for the

new line of Aion FX 125B projects was that if they had modifications, they still had to have a way of

getting stock tones, e.g. a switch setting or a knob position—and the Presence control did not do that.

HALO DISTORTION/SUSTAINER