Xenrelic Amplification

12/26/2025

Messing around with my buddy Marty’s Fuzz Face and we figured out a cool adjustable Volume Boost solution if you need a bit more db’s on the main Volume control to achieve unity gain or get a slight boost over unity happening. It requires a few extra tweaks like an RF filter on the input jack, but the results are worth it and actually make the JH-F1 Fuzz Face a pretty decent sounding fuzz after with a more useable range of Volume adjustment. While I was in there we decided to go with a DMT series polyester film and foil 100nF cap for C3 to the Volume control input, to get a slight bit more warmth than the stock metalized polyester cap offers. The internal 1k volume boost trim pot replaces VR2 on the board as a fixed value resistor with lugs 1 and 3 connected in VR2’s place and wiper lug 2 connected to the input of C3. The RF filter is just a simple 1k resistor from the input jack to the footswitch with a 100pF cap to ground after the 1k resistor. I like the Volume Boost trim set at about 638ohms between R4 and C3. The VR1 bias trim for Q1 underneath the pcb is adjusted to about 10.68k

12/19/2025

12/17/2025

Here's a sound sample of our latest Klon Centaur mod.

This particular build features:
-More tube like warmth and coloration.
-Custom hybrid clipping architecture utilizing ultra-rare harmonically rich Hungarian germanium diodes with a specific hand matched forward voltage that sound the most tube like of any of the diodes I've tested in this circuit and I've combined them in tandem with a custom clipping circuit for the ultimate clean boost and overdrive lead tones.
-Improved EQ shaping and signal fidelity.
-Improved road reliability.
-Highest quality components.
-CTS pots
-Switchcraft USA jacks and 9VDC adapter plug.
-Carling Footswitch
-20awg silver plated copper wiring.
-Davies Daka-Ware k***s.
-Ultra tough ceramic polymer Metallic Ice Blue finish with white LED.
-Hand made right here in California.

12/03/2025

So stoked on this high gain module prototype.

12/03/2025

10/21/2025

~Latest build~

Grey Lab Research - Modified Professional Overdrive #021

Build features:
-More tube like warmth and coloration.
-Custom hybrid clipping architecture utilizing ultra-rare Hungarian germanium clipping diodes with a specific hand matched forward voltage in tandem with a custom clipping circuit for the ultimate overdrive tone.
-Improved EQ shaping and signal fidelity.
-Improved road reliability.
-Highest quality components.
-Real CTS pots
-Switchcraft USA jacks and 9VDC adapter plug.
-Carling Footswitch
-20awg silver plated copper wiring.
-Davies Daka-Ware k***s.
-Metallic Ice Blue durable finish with white LED.
-Hand made right here in California.

*chefs kiss*

05/11/2025

🤙

02/13/2025

Xenrelic Cobalt 2.0 🍄🤙

02/10/2025

The latest Xenrelic Cobalt (Modified Professional Boost Overdrive) offering.

We managed to fit the awesome Cobalt Deluxe into a smaller pedal board friendly housing and added some rad new features.

This one really appeals to the hotter aggressive tones and sounds so gnarly.

The pinch harmonic detail is amazing and the sustain for solos absolutely kills.

The frequency boosted voice selections really take the overdrive end to the next level and the parallel Ge/Si clipping architecture sounds so sick and unique.

This one is defs my favorite version so far.

The original smoother voiced Cobalt Deluxe we designed with James Robinson in the metallic blue housing is a banger too, but that one we voiced more for classic rock, blues and jazz fusion styles, whereas the new one suits the more aggressive tonal shaping palette while still functioning as an awesome clean boost in the counter clockwise region.

10/14/2024

Here's a rad Vibrolux Reverb I modded.

Replaced the capacitors and resistors with better sounding more reliable versions that bring out the full tonal capabilities and then added some circuit architecture modifications to enhance the gain structure and sustain while retaining the ability to still achieve that beautiful vintage clean warmth vibe of the true vintage era Fenders.

Converted the bright switch into boost function to shift the frequency response into a more modern pushed indie rock tone that improves the overdrive capability in the upper register of the volume control, but also adds a nice mid boost to the clean region of the volume control.

The Custom channel was modified with more of a '59 Bassman style feel that blends really nicely with the modded power amp that was set up for more sustain and shifted negative feedback.

There's a switch on back that let's you get a a more vintage feedback setting for cleaner tones and when you switch it up it engages a custom feedback sound that enhances everything up a notch to really bring out the best this amp has to offer.

For the speaker selection I went with a custom Weber Alnico California 10" JBL D110F clone for that warm sparkling clean tone and complimented it with a darker Jensen Mod 10-70 for a smoother Jensen that has a Celestion Greenback style cone for this really cool hybrid tone that enhances the low end nicely and balances out the highs of the California Alnico.

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08/19/2024

Here's a rad Emerald Green Deluxe Reverb that I built a while back. This version has a bit different capacitor selection from the Purafied Deluxe to give it a more Hi-Fi coloration with Sprague 715P polypropylene film and foil caps vs. the more classic warm vintage feel that old polyester film and foil caps have.

The lows are extended and the highs are clearer, yielding a superb modern/vintage clean tone, but the amp still retains the pink noise warmth of the carbon composition resistors in the signal path.

This is one of my favorite versions of the Deluxe Reverb when primarily seeking excellent vintage Fender clean tones with a modern Hi-Fi twist. The clarity and feel is pretty amazing.