Potentiometer for Marshall JCM800, 22 kOhm linear

Microcontroller-controlled MIDI switcher for channel switching or loop switching. Operation can be performed either via MIDI or a footswitch (momentary switch).

!!! UPDATE !!! With the May 2019 update, the following adjustments were made to the module:

• The large relay board has been removed and is no longer included in the kit, as a wide range of different relays with carrier boards is now available, offering much more flexible applications.
• The documentation has been consolidated and is available as a PDF download directly with the kit.
• The microcontroller with the firmware is no longer included in the kit and must be ordered separately depending on the desired version.

These changes allowed us to offer the kit in a more universal, flexible, and cost-effective way. More short information and software on the >>TT-Midi-Switcher project page

Included in delivery:

• Controller board
• Components for 5V onboard power supply
• MIDI socket
• ULN2803A driver IC
• Optocoupler for MIDI-IN
• Crystal, resistors, and capacitors

NOT included in delivery (order as needed!):

• Relays, relay carrier boards, and flyback diodes
• LEDs and current-limiting resistors
• Buttons and switches
• Cables and wires
• Microcontroller with firmware

TT Selection: V1 - Low Noise
This tube is selected for sensitive input stages (V1)

Sweet and warm sounding preamp tube with high gain. We recommend this tube for guitar/bass amps.

Files:

• Datasheet

JJ's version of the ECC81/12AT7 tube type with a warm and soft sound. Often used for phase inverters or reverb drivers.

Files:

• Datasheet

4 tubes, matched as quad

EL34 II has fuller low mids and low end but does not lose headroom in the high end. Stronger than regular JJ EL34 but not as aggressive as the JJ E34L.

• Ua = 250 V
• Ug3 = 0 V
• Ug2 = 265 V
• Ug1 = -13,5 V
• Ia = 100 mA
• Ig2 = 14,9 mA
• S = 11 mA/V
• Ri = 15 kΩ
• μg2/g1 = 11

• Ua0 = 2000 V
• Ua = 800 V
• Wa(max) = 25 W
• Ug20 = 800 V
• Ug2 = 450 V
• Wg2(max) = 8 W
• Ik = 150 mA
• Uk/f = 100 V
• Rk/f = 20 kΩ

Files:

• Datasheet

• Power Rating: 0,125 W log
• Voltage Rating: 150 V AC
• Tolerance: 20%
• Shaft: 6,3 mm, Solid Shaft
• Shaft length: 15 mm
• Drill Ø: M7 (6,8 mm)
• Termination: Solder lugs
• Dimension: 16 mm

Fuseholder for 5x20 mm fuses, PCB-mount

• Size: 6.3 mm 1/4"
• Poles: 2-pole, mono
• Design: straight
• Connection type: solder connections
• Housing: metal, large
• Color: black
• Cable entry: max 9 mm
• Manufacturer: Rean (by Neutrik)

Files:

• Datasheet

Bourns PDA24 Potentiometer, HRT-Type, high torque, Recommended for amplifier.

• Mounting: Panel
• Shaft Type: rund, straight
• Terminal: Solder Terminal
• Power Rating:
  • Log: 250 mW (1/4W)
  • Lin: 500 mW (1/2 W)
• Max. Operation Voltage:    
  • Log: 250 V
  • Lin: 500 V
• Standard Resistance Tolerance: 15%
• Operating Temperature: - 10 C bis +70 C
• Diameter Shaft: 6,35 mm
• LengthShaft: 19 mm
• Rotational Torque: High 70 bis 100 g-cm

2 tubes, matched as pair

Rugged and wonderful-sounding Power Beam tetrode that performs flawlessly at up to 475 volts. Great replacement for single-ended amps such as Fender Champ, or high plate voltage amps like the Fender Deluxe Reverb.

• Specially developed cathode coating
• Tri-alloy plate material
• Carefully aligned grid

• Rated Voltage: 250 VAC
• Contact caps: nickel-plated brass
• Size: Ø 5 mm x 20 mm