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Mad Professor / CS-40 / 2010's / Let Us Know! / Amp For Sale

There is nothing mystic about this amp, it's pure magic…

Preamp distortion and/or Power-amp distortion, with or without compression at any volume level.

Three (3) gain structure options (Normal, Abnormal/Tube and Abnormal/FET).

Four (4) different ways to adjust the ever critical treble response.

Foot-switches for FET and adjustable Boost.

Dynamics you have never experienced.

Magical Bjorn Juhl circuit. THE TONE! Hand made point to point wired 40-75W tube amp that is fine-tuned for the best possible tone. Based on the experience Bjorn Juhl has had working with finest tubes amps for 20 years. The circuit is as original as a tube amp can be, respecting the heritage of the greatest amps designs. The fine-tuned circuit with build in bias adjustment accepts 6L6, EL34, KT66, KT88 ... even 6V6 if you can find ones that can handle 500V of plate voltage. The overbuild custom transformers have enough juice to drive the KT88's/6550's to about 75W of power. With special POWERSUCK switch you can drive the power-amp to fat compressed tone at bedroom levels. We are not talking about 3-dimensional tone, this one is a 4-D tone! And the touch response is awesome, this is about the most dynamic amp I have seen. There are tones from sparkling clean to fat and sweet, singing overdrive, from sparkle to rumble... Nothing but the best covering is used, no thin tolex here. ALL the parts are overrated and should last for ages.

The amp is already available by custom order and it can be played all over the world (100/117/230/240V). Price only for the head! MORE INFO ON THIS AMP HERE:


Price: €5200,- (€4262,- Euro VAT 0%)

Retail prices are examples, these are scandinavian prices with 22% VAT.

The prices might vary on the different markets

Mad Professor Amplification Ltd., Finland  

Contact name:
Harri Koski
Mad Professor Amplification
Finish and English
Amps & Effects Pedals
Opening hours:
Email or call.



Bjorn Juhl, Guitarist, designer, amp wizard and pedal guru. Bjorn is a modern day electronic wizard that is fast gaining reputation with his original designs in pedals and amplifier.
He has earned his nick name “Mad Professor" with his know-it-all knowledge about tube and analog electronics and his “innovate, not imitate attitude.

Bjorn Juhl has what it takes to become an icon: perfect ear, great skills in guitar playing and unsurpassed knowledge in electronics.

Bjorn has played and recorded as a semipro in various bands like powerpop with The Renegades and blues with many bands (including TC Travis Band), heavy metal, punk in Sex Pistols cover band and now he is playing and recording original music with The Bradshaws plugging his heavily modified Les Paul or Flying V to bunch of BJF pedals.

Mad Professor Amplification Ltd, Production Manager

Jukka Mönkkönen: Guitarist, amp tech, the Lord of the Soldering iron, Jukka has been playing as a semi pro guitarist for few century’s. A true Gibson devotee, likes to plug his 1959 Les Paul Special or one of his many other Gibson to his 007 (“Licence To Play") Mad Professor and fill the air with thundering licks. Jukka has an electrical engineer degree and has been fixing and building amps from early 80´s. Jukka has been with the Mad Professor from the beginning, building the first prototype. Jukka also helped designing the layout and the chassis.

Mad Professor Amplification Ltd, Marketing and management

Harri Koski: Guitarist, marketing, cordinating the production, helping hand.

Harri has been playing guitar since mid 70´s and his serious hobby turned into a business when he started Custom-Sounds ( in 1996. Custom-Sounds was a high-end guitar gear company from the beginning and it was one of the first “boutique" guitar shops on internet. His co-operation with Bjorn Juhl started the BJF pedals business and soon these two soul brothers were talking about the ultimate amplifier. Bjorn Juhl and Harri had the mad idea about designing the ultimate guitar tube amplifier and to make it right here in Scandinavia. Bjorn put on his propel-hat and Harri put all his energy and money into this project. Soon we found the right people to work with us and the world got a brand new amplifier that was not a clone of any vintage amp as these modern hand-wired amps often are. Harri has a collection of various Gibson guitars and early JV Squier Fenders and plugs these into his serial no: 000 Mad Professor prototype head that is played loud almost every day.


Tapani Santanen: Guitarist, industrial designer, interior architect SIO.

Tapani has been plying guitar for over 20 years and likes the classic guitars and amps and we believe he has designed a future classic in the Mad Professor amp. Tapani is a Fender man, his tone is a vintage Strat or a Tele into one of his vintage Fender combos with a little help from a TS-808.


Erkki and Iiris Mero, Erkki used to work as professional Bassplayer, he now has a Masters degree in upholstery. It takes the incredible craft of Mero couple to make the beautiful two color upholster of the Mad Professor. Mero’s has upholstered many classic cars in Finland but their pet project is the unbelievable 1969 Waxenberger Mercedes-Benz 300SEL 6.3 racer clone they own.

See complete dealerlist here or contact us directly regarding ordering:

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