aion MAELSTROM Handbuch - Seite 6

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BUILD NOTES

Using SMD JFETs

The J201 JFET is no longer available in through-hole format. This PCB uses a hybrid through-hole/

SMD outline for each JFET. An extra "G" (gate) pad is included to accommodate surface-mount devices

without the need for adapters. SMD JFETs should be oriented as follows:

All surface-mount JFETs use the same pinout, so this configuration will fit any type that we're aware of.

However, always check the datasheet if you're uncertain—they're difficult to desolder.

J201 adapters

Many DIY builders are intimidated by the small size of surface-mount parts. Aion FX offers

J201s on adapters

so they can easily be used as through-hole parts.

Vintage Microtubes specifications

The Vintage Microtubes uses an almost identical circuit to the B3K, but with several parts substitutions

to give it more of a vintage flavor.

PART

NEW VALUE

261k

R14

220k

R15

see note below

R17

330k

R21

10k

The only other addition is a 220n capacitor in series with R15. The Maelstrom PCB does not include

space for this capacitor. It can be omitted entirely (the unit will have slightly more bass available). Or,

you can "tent" it with the resistor by putting one leg of the capacitor in one pad of R15, one leg of the

resistor in the other pad, and then soldering the leads together above the PCB.

In addition, the VMT hardwires the Attack switch in treble boost mode (left toggle position) and the

Grunt switch in the highest-bass mode (right toggle position). It's recommended to include the switches

in this build and just be aware of the "vintage" positions.

Note: The Vintage Microtubes also uses 6.65k resistors for R9 and R16 instead of 6.8k. This is almost

certainly just due to manufacturing convenience since the unit is fully SMD and many brands of

precision resistors aren't available in E12 or E24 values. It's recommended to stick with 6.8k in these

two positions.

MAELSTROM BASS DRIVE

PART

NEW VALUE

R25

100k

22n

C10

220pF

C14

220pF

pre-soldered

PART

NEW VALUE

C16

C17

4n7

C18

C19