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Mad Professor Old School 21RT main image

Mad Professor Old School 21RT image 2

Mad Professor Old School 21RT image 3

Mad Professor Old School 21RT

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Mad Professor Old School 21RT

$2,209.98 Price Tier: High-end

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Page last updated Apr 01, 2026

Pricing and availability

We compare 600+ stores and found this item at 1 store. Prices updated January 14, 2026.

Store

Reviews

Price

WC Music Store

$2,209.98

Average Price: $2,210

High-end/Boutique

$300

$701+

Price Tier

In the Combo Guitar Amplifiers category, Mad Professor Old School 21RT is priced in the High-end/Boutique range. This premium gear is built to very high standards and offers premium features.

Budget

Standard

High-end

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Description

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Discover the Mad Professor Old School 21RT, an amplifier that embodies the essence of vintage sound with modern versatility. Whether you're diving into the soulful tones of the '50s or jamming to the alternative rock of today, this combo guitar amplifier is your gateway to timeless sonic landscapes. Designed by a brand renowned for crafting exceptional pedals, this amp seamlessly integrates with your pedalboard, ensuring each effect shines through with clarity.

With the Old School 21RT, you won't need to worry about channel switching; its dynamic response allows you to traverse from clean to distorted tones with a simple tweak of your guitar’s volume and tone knobs. This flexibility makes it ideal for a wide array of genres, from country and pop to hard rock and reggae. Adding to its charm, the built-in reverb and tremolo provide that final touch of vintage authenticity, allowing you to craft tones that are as rich and resonant as they are diverse.

Key Features:

21W all-tube combo amplifier
Capable of producing classic tones from clean to distorted
Built-in reverb and tremolo
Designed to work seamlessly with pedals
Suitable for various music genres, including rock, pop, and country

Videos

Mad Professor Pedals

Mad Professor Pedals

Mad Professor Old School 21RT demo: Part 1 by Marko Karhu

Video thumbnail for Mad Professor Old School 21RT demo: Part 1 by Marko Karhu by Mad Professor Pedals

Mad Professor Old School 21RT demo: Part 1 by Marko Karhu

Mad Professor Pedals

Mad Professor Pedals

Video thumbnail for Mad Professor Old School 21RT demo: Part 2 by Marko Karhu by Mad Professor Pedals

Mad Professor Old School 21RT demo: Part 2 by Marko Karhu

Mad Professor Pedals

Mad Professor Pedals

Video thumbnail for Jarmo Hynninen demo the Mad Professor Old School 21RT amp and few pedals by Mad Professor Pedals

Jarmo Hynninen demo the Mad Professor Old School 21RT amp and few pedals

Mad Professor Pedals

Mad Professor Pedals

Video thumbnail for Mad Professor Old School 21 RT amp and Porter 112 cab demo by Marko Karhu by Mad Professor Pedals

Mad Professor Old School 21 RT amp and Porter 112 cab demo by Marko Karhu

Mad Professor Pedals

Mad Professor Pedals

Video thumbnail for Mad Professor Old School 21RT demo: Part 3 by Marko Karhu by Mad Professor Pedals

Mad Professor Old School 21RT demo: Part 3 by Marko Karhu

Mad Professor Pedals

Mad Professor Pedals

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Genre Usage

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See also: Combo Guitar Amplifiers, Mad Professor, Mad Professor Combo Guitar Amplifiers, High-end Combo Guitar Amplifiers

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Gear IQ 65