RESISTORS: All 1% metal film – NO value substitution here
CAPACITORS: A mix of solid polymers, low ESR electros – The 2 MLCCs (C8 & C13) were substituted with CDE dipped silver mica caps. Dipped silver micas, per my experience using ‘em, they do wonders to the sound of pedal circuits. They’re kinda pricey depending on where you buy ‘em but it’s worth including those in your capacitor arsenal. I will also try the C14 mod (for thin treble) in a later time.
IC1 & 2: TL072 – I didn’t test any other OpAmp
DIODES: I didn’t bother to try the D9E either although there’s a lot of ‘em in eBay. I tried 1N270 but didn’t like the result so I used a BAT41 instead. I have previously used this diode & I like the quality of the distortion.
I tried the AION Refractor Bypass PCB but I screwed up the 3PDT during soldering so I ended up using a used Carling 2PDT. Luckily, those 3 resistors did fit snugly in the switch’s “crevice” like it was designed to cradle the resistors as you can see in the posted picture. The DPDT works okay but I will still re-install a Refractor Bypass PCB soon.
Lastly, I installed Small Bear’s light plate. Doesn’t the picture look cool?
EQUIPMENTS: Marshall JVM 205H head / Marshall 1960A cab / IBANEZ S5470Q guitar. Jackson Japan-made Warrior guitar with genuine SD Invader humbuckers. Only Refractor OD is connected.
TEST RESULTS: IMHO, the Refractor OD will beat the TS9 Tube Screamer hands down. This baby has a very distinct sound quality! Don’t just listen to it…..build & play it yourself!
Kudos to Kevin & the AION tech staff for a superb re-design of the Klon Centaur Pro OD.
Have you been on the back of a Centaur lately-:)? Please share your thoughts with us. Thanks for reading.