Carl's Custom Amps Chicago Harp Master 2x8 Combo in Dark Tweed

Ext. Cabs and Covers available!

For the foreseeable future build times will be between 8 to 14 weeks. We are experiencing very high demand. Each amp is built one at a time with great care so no rushing is possible. Thank you to everyone who has purchased for your business and patience!


The Chicago Harpmaster is mixture and perfection of early Fender and Masco P.A circuits that gives off that thick dirty Chicago sound that players like Little Walter and other great Chicago blues players are known for. The amp is designed specifically for harp! The octal pre-amp tube gives a fat smooth sound and special circuitry minimizes feedback and accommodates any Hi-Z microphones including crystal mics that sometimes interact poorly with an amp designed for guitar.

The amp is cathode biased and uses a tube rectifier. 6V6s are used in our 15W model. The amp has body control that pan from full push-pull to single-ended Champ type tones with an accompanying volume decrease that allow you turn the amp up more.

This listing is for the 15W 2x8 Combo  but I also offer the amp in a head and cabinet setup or as a 4x10, 2x10, or 4X8 combo for the 30W or 2x10 or 2x8 15W combo.


 15W all tube power, 6SL7 pre-amp,  6V6 power tubes, 5U4 Tube Rectifier, Vol, Tone, and Body controls, 8 ohm speaker out.

Hammond Power Transformer, Custom Wound Output Transformer,  Cliff and Switchcraft Jacks, JJs and NOS USSR tubes, Marlory 150 and Panasonic tone caps, ultra long life filter caps, finger joined cabinet, special resistor selection for the least noise and best tone, galactic grounding for low noise, DC Elevated heater system for low noise, Weber Speakers.

Customer Comments:


I have had my Harp Master 15 1x10 about two months now. I have gigged it five times and used it for several band rehearsals. This is the tone I’ve always heard in my head! The amp slips into breakup with such ease. No pedals of any kind needed. Beautiful, organic breakup, right where you expect it to be. Very responsive to player input and very predictable. Like driving a car you’ve had for many years; you can take it anywhere and do anything with it, because it has become an extension of yourself. Nice balance from the bottom end to the top end. Enough bite to cut through a band mix, but not harsh or offensive in any way. And the speaker hasn’t even broken in yet! In fact, I gigged the amp they day after it arrived on my doorstep! The fit and finish are impeccable. The graphics are tasteful and professional. Everything about this amp, from the look, the build quality and most importantly, the sound, all exhibit an air of quality. I have owned three hand-made, special-order harp amps over the years, and I have sold every one of them, shortly after receiving them. This amp will be my “desert island” amp. The Harp Master will be with me until the end! Thank you for making a dream come true!

Chris Balding

Tallahassee, FL”

ConditionBrand New (New)
Brand New items are sold by an authorized dealer or original builder and include all original packaging.learn more
  • Chicago Harpmaster 15 2x8 Combo
  • 2022
Made In
  • United States

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Carl's Custom Amps

Las Cruces, NM, United States
Joined Reverb:2014

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