Carl's Custom Amps Chicago Harp Master 30W Head Your choice of cosmetics!

Ext. Cabs available! 

Add London Power Scaling for $200 for complete control over the volume and output. 

For the foreseeable future build times will be between 9 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 are known for. The amp is designed specifically for harp! The octal pre-amp tube give a fat smooth sound and special circuitry minimizes feedback and accommodates any Hi-Z microphone including crystal mics that sometimes interact poorly with an amp designed for guitar.

The amp is cathode biased and uses a tube rectifier. In the 30W version It uses 5881s for 30W but 6V6 can be swapped in for 15W.  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 head but I 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. The 4x10 is the cleanest followed but the 2x10 and then the 4x8. I  offer the speaker as all Alinco smooth cones for quick breakup and smokey tones or with blend of Alinco and Ceramic speaker for more definition and headroom.


30W or 15W all tube power, 6SL7 pre-amp, 5881 or 6V6 power tubes, 5U4 Tube Rectifier, Vol, Tone, and Body controls, 8 ohm speaker out.

Hammond Transformers made in Canada,  Switchcraft Jacks,    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. 

ConditionBrand New (New)
Brand New items are sold by an authorized dealer or original builder and include all original packaging.learn more
  • Chicago Harpmaster 30 Head
  • 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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