Formula 50 Overdrive Head

Formula 50 Overdrive Head


The Schroeder Amplification "Formula" series took over 12 years of tweaking and adjustment before it could wear the Schroeder badge. The final product is known for its ability to sit right on the edge to where a player can use his pick/finger attack to make the amp shift from a chiming, relaxed and shimmering tone to one of full "chunk" grind. It is often said to have all of the qualities of the finest Marshall amps without the bad ones. You only need to watch the video of Jake Cinninger playing the prototype to understand what these are capable of...

Specs and features of note:

-Chassis is made of 1/8" (!) folded and welded aluminum, powder coated and screened.

-A 10 turn pot with locking dial is located just to the left of the tubes. This combined with the tip jacks (1 for each power tube) located on the back, make user bias and tube changes safe, fast and easy. 

-All internal wiring connections made using silver or oxygen free copper wire of 99.9999% purity. Unlike generic "cloth covered" wire, it will not absorb airborne moisture, oxidize and/or degrade the signal over time. Using this wire requires special tools and means that EVERY wire needs to be cut to length and tinned with specially formulated silver bearing solder. A laborious and time consuming process but the resulting improvement to the sound is stunning!

-The Custom power and output  transformers have all been developed over our decades long relationship with Mercury Magnetics. They feature custom winds and lots of iron for reduced "sag", a tight and transparent low end and silky highs.

-Specific components are cryogenically treated to aid in their transparency.

-A very fast and "organic" feeling solid state rectifier circuit means greater reliability and musicality.

-60 cycle hum is kept to a minimum due to the additional power supply components in the preamp section.

Tube compliment:

-3X Sovtek 12AX7LPS, Pair JJ E34L

Front Panel (left to right):

-1/4" input, 3-way bright switch, Pre, Treble, Middle, Bass, Master, Presence, Standby Switch, Pilot lamp, Power Switch.

Rear Panel (left to right):

-2A Slo 20mm fuse, 500Ma Slo fuse, Neutrik “Power One” female power socket, 3X "Tip jacks" (for bias measurements), 1/4" 4 Ohm out, 

1/4" 8  Ohm out, 1/4" 16 Ohm out. 

Options: Additional charge. Please contact me for pricing

-NOS tubes

- All tube buffered effects loop with controls for both send and return levels, 0/-20 switch for pedal/rack gain structures and a mix/serial switch.

- Record out. TS or balanced via TRS or XLR

- Speakon connectors. 

- Parallel outputs for running different speakers (for color) or running bi-wired speaker cables for maximum bloom in the bass register. 


-50 Watts 


-11 3/8" Deep x 10 5/8" Tall x 21" Long 


Unless currently in stock, lead time is two to three weeks. 

If your shipping address is outside the continental U.S., please contact us for payment of additional shipping charges. 

Made for you:

Different colors, finishes and other customizations are available. Please feel free to call or email to discuss your project and requirements.


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