Versoul Amp and Cabinet
The Versoul amplifier features a very wide palette of dynamic tones, ranging from silky jazz, clean and edgy 60’s British tones to modern thick, massive tube distortion. All with great definition, and the same level of craftsmanship that you have come to expect from Versoul acoustic and electric guitars. The amp’s concept design and the head & cabinet are designed by Kari Nieminen. The circuit is designed by Jaakko Turunen.
The pre amp section is influenced by Tweed and Black Face Fender amps. The power amp sections are reminiscent of early VOX AC30 & AC50 (Class A), as well as early low wattage Marshall combo amps, and the early Mesa Boogie Mark 1 amps. However, modern features have been added such as Recording Out, Power Soak, and a fully tube driven effect loop. The Versoul amp is double single-ended, with two power tubes cathode biased, wired in parallel and work in Class A.
In Versoul Amp there are two power tubes, individually adjustable by their own master volume pots. Several type octal socket tubes can be used without adjusting the bias voltage. The power tube V5 is the GAIN CHANNEL power tube. It can be adjusted by MASTER GAIN pot. The power tube V4 is the NORMAL CHANNEL power tube. It can be adjusted by MASTER NORM pot. So, the player may adjust the desirable power tube volume for the preamp channel in use. When GAIN CHANNEL is selected by front panel switch or footswitch, only power tube V5 is activated and adjustable by its MASTER GAIN pot. When NORMAL CHANNEL is selected by front panel switch or footswitch, only power tube V4 is activated and adjustable by its MASTER NORM pot.
Please notice: There is PULL DUAL switch included in MASTER GAIN pot. When pulled up this switch, both of power tubes are switched on all the time. Not depending on, which of the preamp channels are switched on. Still You can adjust each of the power tubes individually with their own pots to find variable tones and harmonics altering the volume amount of each power tube types. In this PULL DUAL option, of course, You can achieve more output power of the amp, too.
V5 tube socket: 6V6, 6L6, 5881, KT66,
V6 tube socket: 6V6, 6L6, 5881, KT66, EL34, 6CA7, 6550, KT88.
Depending on the choice of tubes used, the output power will vary from circa 5 watts to circa 22 watts.
Additionally, several different rectifier tubes can be used on V7 tube socket: 5Y3, 5AR4, GZ34, 5U4, 5U4G.
The preamp section has two channels, and several different noval socket tubes can be used: Tube V1 tube socket: 12AX7, 12AU7, 12AT7, 12AY7, 12DW7, 5751. Tube sockets V2 and V4: 12AX7, however other tubes may be used but not recommended. Tube socket V3 (Gain Driver tube): 12AX7 or other tubes like 12AT7 or 12AU7 if you prefer warmer less distorted gain sound.
Channel 1 with PRE NORM- preamp control: Two preamp tube V1 and V4 in use Channel 2 with PRE GAIN and
POST GAIN -preamp controls: Three preamp tubes V1, V3 and V4 are in use. The Versoul amp has a unique effects loop, which is fully tube driven. Both send and return signals are individually adjustable, allowing the use of line level and guitar level signals. The loop can also be used as an extra gain stage for distorted boost, when not used for effects. In this function, the return and send pots control the amount of additional gain/boost desired. The loop is also footswitch activated. A fully adjustable power soak (power attenuator) allows you to crank up the amplifier’s power tubes at low volume level.
The blue anodized chassis is made of sturdy 2 mm thick aluminium (US 12 Gauge 0.0808 inch), with hand welded joints. Turret board, point to point construction, and high quality Bourns pots are also used. All components are carefully selected and are very high quality; for example, paper in oil, Orange Drop coupling and Jupiter Vintage tone caps in the preamp and effects loop section. Power transformer, output transformer and power choke are all made by Hammond. The internal wiring is military standard Alphawire cable, and conductor material is a silver-plated copper. The cable insulation is resistant to 600 volts (voltage 600 V is a minimum rating). The head and cabinet are made of solid Finnish pine, with strong glued finger joints. The front and back cabinet plates are made of 1/4’’ thick birch Finnish plywood, which results in great resonance. Covered in genuine blue leather (optional cover material is blue Tolex-style vinyl), the piping and handles are
also high-quality leather. Each corner leg is hand pressed, and cut to shape. The Cabinet is equipped with two Celestion AlNiCo Gold 12’’ speakers, with a power handling of 100 watts. The cabinet features semi-open construction, which creates a thick, focused and open sound compared to fully closed or open back cabinets/combos. Pot knobs are ebony and inlaid with green abalone dots.
The function of a rectifier is to change the mains alternating current (AC) into direct current (DC). On a guitar Amp, either a tube or semi-conductor rectifier may be used. The amplifier tone depends strongly on the rectifier method, even though the guitar sound does not pass through the rectifier.
When hitting the guitar string, the resulting signal causes some electrical changes into the amplifier circuit. The signal depends on the nature of the player’s “touch”, the type of guitar, and countless other individual factors- all which affect the electrical process.
The semi-conductor rectifier current resistance is negligible, which is why it cannot react to dynamic changes. Therefore, solid-state phase of rectifier amps are articulate and aggressive, but also colder and stiff. As the semiconductor rectifying operating cost is very cheap, most modern amplifier manufacturers have unfortunately given up the use of rectifier tube and opted for the semiconductor. This, however, eliminates what we believe to be one of the greatest tone-producing elements of guitar amps.